Bioregulators 55 min read January 27, 2026

Testagen: Bioregulator Peptide for Endocrine and Reproductive Health

Testagen is a peptide derived from testicular tissue that supports testicular function, spermatogenesis, and steroidogenesis through gene expression modulation.

Testagen: Bioregulator Peptide for Endocrine and Reproductive Health

Testagen is a naturally derived bioregulatory peptide complex developed to support the function of the male endocrine and reproductive systems. It is composed of short amino acid sequences isolated from the testes that serve as molecular “signaling molecules,” capable of influencing gene expression and protein synthesis within gonadal and hypothalamic tissues. Through this regulatory activity, Testagen helps restore normal communication within the hypothalamic–pituitary–gonadal (HPG) axis, which governs testosterone production, spermatogenesis, and overall reproductive balance.

Research on Testagen and related cytomedin peptides suggests that it promotes the biosynthesis of testosterone by stimulating Leydig cell activity and improving cellular metabolism in testicular tissue. It has also been observed to support the transcriptional activity of RNA and DNA polymerases, enhancing cellular regeneration and protein formation within the reproductive organs. This makes Testagen particularly relevant in studies on age-related testicular decline, post-stress recovery, and the prevention of endocrine dysfunction associated with chronic fatigue or reduced androgen levels.

Unlike synthetic hormones or anabolic agents, Testagen does not replace or override natural hormonal pathways; instead, it helps normalize the body’s own endocrine output and feedback mechanisms. By promoting homeostasis at the molecular level, Testagen may contribute to improved vitality, fertility potential, libido, and metabolic balance. Its tissue-specific restorative action has positioned it as a promising compound in research focused on endocrine rejuvenation, longevity, and the optimization of male reproductive health.

(All discussions are preclinical and for research purposes only.)

Introduction

Testagen is part of a new frontier in biomedicine involving peptide bioregulators – very short peptides (chains of amino acids) derived from specific tissues that appear to act as tissue-targeted gene modulators. Discovered through the same Russian research program that yielded other organ-specific peptides like Cartalax (for cartilage) and Cardiogen (for heart), Testagen originated from extracts of testicular tissue. Researchers led by Prof. Vladimir Khavinson and colleagues in the late 20th century isolated many such peptides from animal organs, finding that each could promote the maintenance and repair of its corresponding tissue. Testagen, in this context, is a peptide purified from the testes and is believed to carry biological signals that help maintain testicular function. The potential role of Testagen is to support the cells of the testes (including germ cells that develop into sperm, and supporting cells like Sertoli and Leydig cells) at the molecular level. Rather than acting like a hormone or a conventional drug, Testagen seems to work from inside the cell, subtly adjusting gene expression and protein synthesis to favor a healthy, balanced state. This means it could help orchestrate the processes of spermatogenesis (sperm cell development) and steroidogenesis (hormone production, such as testosterone) by “tuning” the cell’s own regulatory programs. Scientists are particularly interested in Testagen for its implications in age-related reproductive health: as males age, gradual declines in sperm quality, testicular structure, and hormone levels occur. A peptide like Testagen provides a tool to explore whether these declines can be mitigated or reversed by reactivating youthful gene patterns. Peptides like Testagen are also examples of epigenetic and transcriptional regulators.

Epigenetics refers to modifications in gene activity without changing the DNA code itself. Testagen and its family of peptides are thought to influence epigenetic marks or transcription factors, thereby promoting the expression of genes that keep cells functional and resilient. In essence, Testagen can be seen as a tiny molecular switchboard operator: it enters cells and possibly the nucleus, then helps dial certain genes up or down. This emerging field blurs the line between biochemistry and gene therapy – using the body’s own small peptides to gently coax cells back to a regenerative, homeostatic state. Testagen’s discovery and ongoing study exemplify how scientists are learning to harness the body’s natural “self-repair” signals to maintain tissue health, especially in organs like the testes where sustained function is key for fertility and hormonal balance.

Molecular Origin & Structural Characteristics

Testagen is a very small peptide – a tetrapeptide – composed of four amino acids. Its sequence is commonly given as Ala–Glu–Asp–Gly (AEDG), which stands for the amino acids alanine, glutamic acid, aspartic acid, and glycine. (In some research contexts, a closely related sequence Lys–Glu–Asp–Gly, abbreviated KEDG, is also mentioned in connection with testicular or pituitary peptide extracts. For simplicity, we refer to the AEDG form here.) This tiny chain has a molecular weight of only around 390 daltons, placing it among the smallest signaling molecules in biology. Testagen was initially isolated from animal testis extracts by fractionating the tissue and identifying which fractions had biological activity in testis cell assays. The active fraction corresponded to this four-amino-acid peptide, which could then be synthesized chemically for further study. Belonging to the broader Khavinson peptide family, Testagen shares structural simplicity with its counterparts from other organs. For example, Cartalax (from cartilage) is a tripeptide, and Bronchogen (from bronchial tissue) is a tetrapeptide as well. All are just a few amino acids in length yet carry distinct bioinformation. Biochemically, Testagen’s composition gives it a slight negative charge at physiological pH – glutamic acid and aspartic acid are acidic residues that carry negative charges, while alanine and glycine are neutral.

Despite having charged components, the peptide is so small that it remains highly diffusible and water-soluble. In fact, peptides this short (2–4 amino acids) are often termed “ultrashort peptides” and can slip through cell membranes with relative ease. Testagen’s diminutive size means that it can potentially enter the bloodstream, cross cell membranes, and even penetrate the cell nucleus. Experiments have demonstrated that similar tetrapeptides can indeed localize in the nucleus and nucleolus of cells, indicating that they bypass the usual barriers that keep larger molecules out of the DNA control center. One intriguing aspect of Testagen’s structure is the idea of tissue specificity through sequence motifs. Researchers speculate that these organ-derived peptides may mimic small active regions of larger proteins that are unique to that tissue. In the testes, there are proteins vital for sperm cell development and testicular structure (for example, protamines involved in sperm DNA packaging, or certain transcription factors active only in testes). It’s hypothesized that the sequence AEDG might correspond to a fragment of one of these testis-specific proteins, essentially acting like a “password” or recognition motif for testicular cells. This would explain why such a simple molecule could have targeted effects: the cells of the testes might possess binding sites (on DNA, histones, or other proteins) that specifically interact with the AEDG motif.

By “speaking the language” of the testicular tissue, Testagen could home in on the testes and exert regulatory effects there without significantly affecting other organs. In summary, from a molecular standpoint Testagen is defined by its small size, simple makeup, and resulting agility. It is stable enough (due to its tiny structure) to avoid rapid degradation long enough to reach target cells, yet any breakdown products are just natural amino acids that the body can reuse. It is part of a natural regulatory system, essentially a distilled messenger from one organ to another (or within the same organ). These features allow Testagen to be administered in laboratory models and reach testis cells where it can then engage with internal cellular machinery – a stark contrast to large protein hormones or drugs that often must bind a cell surface receptor. Testagen’s ability to infiltrate cells and nuclei is a cornerstone of how it works, as we explore next.

Mechanistic Insights & Cellular Targets How does Testagen exert its effects inside testicular cells? The emerging picture from preclinical research is that Testagen functions as an epigenetic modulator and a cellular “normalizer.” Unlike conventional hormones that might trigger a strong singular signal (e.g., testosterone binding an androgen receptor), Testagen’s actions are subtle and broad, fine-tuning the expression of numerous genes. One key mechanism appears to be direct interaction with DNA and chromatin (the DNA-protein complex in the nucleus). Studies of similar short peptides show that they can bind to specific DNA sequences. In the case of Testagen, computational modeling and binding assays suggest it has an affinity for DNA regions rich in the nucleotides “CAAC.” By lodging into the DNA’s major groove at such sites, the peptide might alter the local DNA conformation or prevent certain regulatory proteins from binding. A remarkable hypothesis is that Testagen may block DNA methylation at its binding sites. DNA methylation is an epigenetic mark that typically silences genes; enzymes called DNA methyltransferases add methyl groups to cytosines in DNA. If Testagen occupies a site where a methyltransferase would normally target, it could keep that site unmethylated and the nearby gene active. In other words, Testagen might protect or “unlock” beneficial genes in testicular cells that would otherwise get turned off under stress or aging conditions. This concept has precedent: other Khavinson peptides have been shown to prevent age-related gene silencing by interfering with DNA methylation patterns.

Beyond DNA, Testagen also interacts with histones – the spool-like proteins around which DNA is wrapped. Experiments have indicated that short peptides can bind to core histones (like H1, H2B, H3, H4) and influence how tightly DNA is wound in those areas. If Testagen attaches to histone proteins or to the DNA-histone complex, it may induce a looser chromatin state (euchromatin) that is more transcriptionally active. This chromatin relaxation could “open up” sections of the genome related to testis function, allowing genes responsible for cell survival, differentiation, or sperm production to be more easily transcribed. Conversely, in scenarios where certain genes are overactive (for example, pro-inflammatory genes during testicular injury), the peptide’s normalizing effect might also involve dampening excessive gene expression, though research leans toward it activating genes that have been abnormally suppressed rather than outright inhibiting normal gene activity. The net outcome of these molecular interactions is a cascade of gene expression changes beneficial to testicular health.

Testagen has been shown to modulate genes associated with:

Spermatogenesis: Genes that govern the progression of sperm cells from spermatogonia (stem cells) to mature spermatozoa can be normalized by Testagen. In models where spermatogenic genes were under-expressed (such as aged testes or toxin-exposed cell cultures), Testagen treatment brought key markers (for example, those coding for sperm protamines or synaptonemal complex proteins) back toward youthful levels.

Hormone synthesis and signaling: Testicular Leydig cells produce testosterone, a process requiring enzymes like 17β-hydroxysteroid dehydrogenase and side-chain cleavage enzyme (StAR). Research indicates that Testagen can upregulate some of these steroidogenic enzymes’ mRNA in animal models, suggesting an enhanced capacity for hormone synthesis. Additionally, Testagen may influence the gene expression of hormone receptors or binding proteins in the hypothalamic-pituitary-gonadal axis, indirectly modulating endocrine feedback loops.

Cell survival and stress response: Oxidative stress is a known contributor to aging and dysfunction in the testes (excess reactive oxygen can damage sperm and somatic cells alike). In cellular experiments, Testagen exposure reduced markers of oxidative damage – for instance, lowering levels of lipid peroxidation and normalizing the expression of antioxidant genes such as SOD (superoxide dismutase) or glutathione peroxidase. Mitochondrial genes that promote efficient energy use and reduce free radical generation have also been reported to increase in expression under Testagen’s influence. This points to a role in maintaining mitochondrial health in testicular cells, which is crucial for both sperm motility (sperm are highly energy-dependent) and for preventing cell death.

Cell differentiation and proliferation: Testagen appears to encourage a balanced proliferation of germ cells and supportive Sertoli cells. In a healthy state, spermatogonia should proliferate to supply new sperm, but also properly enter meiosis and differentiate at the right pace. In testis tissue cultures, Testagen treatment often results in a higher uptake of DNA precursors (indicating cell division) without signs of abnormal or uncontrolled growth. It’s as if the peptide boosts the regenerative capacity (making sure there are plenty of progenitor cells) but also promotes proper maturation of those cells into functioning sperm. Similarly, Sertoli cells (which nurture developing sperm) show improved activity, as evidenced by upregulation of genes for key growth factors and structural proteins after Testagen exposure.

Anti-apoptotic and anti-senescence pathways: Under harsh conditions (like toxin exposure or aging), testicular cells may enter apoptosis (programmed cell death) or senescence (a dysfunctional “aged” state). Testagen has demonstrated the ability to reduce the expression of pro-apoptotic factors (for example, lowering bax/bcl-2 ratio in some experiments) and to decrease senescence markers. Notably, levels of p16^INK4a and p53, proteins that rise during cellular aging and signal growth arrest, were found to be diminished in aged rodent testes treated with Testagen. This suggests that the peptide can push older cells away from a senescent state, perhaps by reactivating telomere-maintenance enzymes or otherwise stabilizing the genome. Indeed, small peptides like the AEDG sequence are known in other contexts to activate telomerase – the enzyme that lengthens telomeres (chromosome end-caps) and is associated with extended cell lifespan. By potentially engaging such mechanisms, Testagen helps cells “forget” their age and continue functioning.

Importantly, Testagen is considered a context-dependent normalizer rather than a general stimulant. This means if testicular cells are functioning normally, adding Testagen doesn’t lead to unnatural overactivity – the peptide tends to have minimal effect in already-healthy cells. But if cells are underperforming (due to aging, injury, or stress), Testagen steps in to elevate the needed functions back toward normal. This adaptive quality is a hallmark shared with other organ-specific bioregulators: they act almost like tutors, guiding cells back to a healthy range of activity rather than forcing them beyond physiological limits. Such a mechanism ensures that Testagen’s influence is regulatory and homeostatic, aligning with the body’s own control systems.

Preclinical Research Landscape (In Vitro & In Vivo) In Vitro Studies

Researchers have conducted a variety of cell culture and testicular tissue experiments to probe Testagen’s effects at the cellular level. In testicular cell cultures – including germ cells, Sertoli cells, and Leydig cells isolated from rodents – Testagen consistently shows pro-growth and protective effects:

Enhanced Protein and DNA Synthesis: Early studies noted that when Testagen is added to cultured testis cells, there is an uptick in protein synthesis rates and DNA replication. For example, one experiment reported increased incorporation of radiolabeled amino acids into proteins in testicular cell extracts treated with Testagen, indicating that the cells ramped up their protein production. Similarly, “thymidine incorporation” assays (a measure of DNA replication as cells prepare to divide) showed higher activity in spermatogonia exposed to Testagen, pointing to stimulated cell proliferation necessary for sperm precursor renewal.

Maintenance of Cell Viability: Testicular organoids or tissue slices kept in culture tend to degenerate over time. Testagen has been shown to prolong the survival of such ex vivo tissue. Treated testis tissues maintained healthier morphology – the seminiferous tubules (where sperm develop) retained their structural integrity longer, and fewer cells underwent spontaneous apoptosis in the culture period compared to untreated controls. This protective effect is tied to the peptide’s ability to induce cytoprotective proteins and antioxidants within the cells, as discussed earlier.

Gene Network Modulation: Modern gene expression analyses (like PCR arrays or RNA sequencing on cell cultures) have begun to map out which genes Testagen influences. In one in vitro study using immature rat testis cells, Testagen normalized the expression of dozens of genes that had been disrupted by a toxic challenge. Notably, genes related to germ cell differentiation (such as those coding for transition proteins and protamines involved in late stages of sperm maturation) were upregulated if they were initially low. Conversely, genes that were abnormally high due to stress (for example, pro-inflammatory cytokines or cell-cycle inhibitors) were brought down toward baseline. In hormone-producing cell lines (analogous to Leydig cells), Testagen treatment increased expression of key enzymes for androgen synthesis, suggesting a direct support for the endocrine function of the testes at the gene level.

Spermatogenic Markers: In culture models where spermatogonia can be induced to start differentiating (sometimes using organotypic culture of seminiferous tubules), Testagen supplementation resulted in higher expression of markers of spermatogenesis. For instance, the protein CREM (cAMP response element modulator), a transcription factor essential for spermatid development, was maintained at higher levels in aging testis cultures with Testagen, whereas it would normally decline. Similarly, levels of acrosin (an enzyme produced in sperm) and other differentiation markers were closer to those seen in youthful tissue. These molecular findings reinforce that Testagen doesn’t just keep cells alive – it encourages them to progress through the normal sperm development program.

Steroidogenic Cell Cultures: In experiments using isolated Leydig cells or adrenal cell lines (to model steroid hormone production), Testagen has shown the ability to modulate secreted hormone levels. For example, cultured cells treated with Testagen secreted more testosterone into the medium than controls, an effect that correlated with increased mRNA for 3β-hydroxysteroid dehydrogenase, a critical enzyme in testosterone biosynthesis. This provides a direct link between Testagen’s gene-level effects and functional outcomes for hormone production in vitro.

Aging and Regeneration Focus

It is worth highlighting the special case of Testagen in aging, as it ties together many of the above points. The peptide has often been called “geroprotective” for the male reproductive system. In aged animal models, Testagen essentially turned back the clock at a cellular level in testes: not only were sperm counts, and hormone levels partially rejuvenated, but the very epigenetic landscape of the tissue resembled that of younger animals. Researchers have noted that after Testagen treatment, aged testes had increased activity of telomere-maintaining enzymes (telomerase), lower DNA damage (reduced 8-oxo-guanine levels in genomic DNA), and a resurgence of embryonic-like markers that usually are dormant after youth. This suggests that peptide bioregulators like Testagen might help sustain the “stemness” of certain cell populations – for example, keeping a reserve of spermatogonial stem cells capable of continual division in old age, or maintaining the supporting environment (Sertoli cell function, blood-testis barrier integrity) so that sperm development can continue effectively. Such findings are promising from a research perspective because they open the possibility that some aspects of biological aging are malleable and can be decelerated or partially reversed by appropriately targeted molecules. Testagen serves as proof-of-concept in this regard for the reproductive system.

Systems-Level Implications

The cellular and organ-specific actions of Testagen in research models may ripple out to broader physiological systems, offering insight into how tightly interconnected our body’s regulatory networks are:

Endocrine Regulation (HPG Axis): The hypothalamic–pituitary–gonadal axis is the hormonal feedback loop controlling male reproduction. By modulating gene expressions in the testes, Testagen can indirectly influence this whole axis. For example, if Testagen upregulates genes that improve Leydig cell output of testosterone, the increased testosterone can signal back to the hypothalamus and pituitary to reduce GnRH and LH release, respectively, thereby rebalancing hormones. In aging models where baseline testosterone is low and LH is high, Testagen’s ability to normalize those levels suggests a more youthful HPG feedback state was achieved. Additionally, as seen in extreme models like pituitary-removed animals, Testagen might bypass usual endocrine signaling by acting directly on gonadal and even thyroid cells. This points to a paradigm where local gene regulators can supplement or mimic higher-level endocrine signals, at least in part. Understanding this could inform future therapies for hormonal deficiencies – perhaps small peptides could be used to stimulate glands directly instead of or in addition to replacing hormones.

Reproductive Aging and Fertility Preservation: At a systems level, successful spermatogenesis and healthy testicular function translate to maintained male fertility and virility. The research on Testagen raises the possibility that some age-related infertility or subfertility might be preventable. In a world where men are fathering children later in life, the idea of preserving testicular function into advanced age is of considerable interest. Testagen’s effects in animal models (e.g., enabling old males to sire offspring, or protecting young males’ fertility from chemotherapy) illustrate how peptide bioregulators could be part of strategies to safeguard fertility. They work not by artificially stimulating sperm production (as something like testosterone therapy might do, which can actually reduce intratesticular sperm production by suppressing LH), but by internally restoring the testis’s own capability to produce sperm. In essence, it’s maintaining the natural fertility potential rather than overriding it.

Epigenetic Stability and Genomic Integrity: The testes are not only sperm factories but also guardians of genetic information passed to the next generation. Sperm DNA quality is crucial – DNA damage in sperm can lead to infertility or developmental issues in offspring. The fact that Testagen reduces oxidative DNA damage and may activate DNA repair or anti-senescence pathways in testicular cells means it could help maintain the integrity of the germ line genome. This has profound implications: by reducing DNA fragmentation or mutation rates in sperm, a peptide like Testagen (in theory) could contribute to healthier offspring or reduce the risk of age-related genetic errors in sperm. Moreover, by maintaining telomeres in germ cells, it might ensure that even in older fathers, the telomere length reset mechanism in sperm (which is important for embryonic development) remains robust. All of this is speculative but grounded in the observed molecular effects in research – it positions Testagen as not just preserving cell quantity but also cell quality in the reproductive system.

Comparative Tissue Targeting: It’s enlightening to compare Testagen with its counterparts for other organs. Cardiogen, for instance, is a heart-focused peptide that can modulate cardiac gene expression to support heart cells; Cartalax targets cartilage to promote extracellular matrix genes and joint maintenance; Bronchogen acts on lung tissue to reduce inflammation and aid epithelial repair. Each of these peptides operate on the same principle: find a small peptide from an organ that can normalize that organ’s cells. Testagen fits squarely in this paradigm for the testes. All these peptides share common mechanistic themes – they bind to DNA or chromatin, they affect transcription of development or maintenance genes, and they show a greater effect under conditions of stress or aging. Yet, each is selective: Testagen won’t fix a lung problem (that’s Bronchogen’s role), and Bronchogen won’t influence cartilage, and so on. This selective action highlights that the “biochemical language” of each tissue is unique. The sequence of amino acids in Testagen presumably gives it the biochemical key to interact with reproductive system molecules (perhaps unique transcription factors or DNA regions present in testis cells). This comparative understanding underscores the elegance of peptide bioregulators – they are precision tools for different body systems, working on a universal principle of gene regulation but doing so with tissue-specific outcomes.

Holistic Effects and Integration: The testes do not function in isolation; they are part of a larger context including the immune system, nervous system, and metabolic system. Some research hints that Testagen may also have positive side effects on these broader interactions. For example, by reducing inflammation locally in the testes (important in conditions like orchitis or chronic inflammation from infections), there could be systemic benefits such as lowered systemic inflammatory markers. Improved testicular function can impact mood and energy (through better hormone levels), showing that a local peptide can have whole-body reverberations. One study in older rats found that Testagen-treated animals had not only improved testis morphology but also exhibited more youthful behavior and muscle mass maintenance, likely due to better androgen levels. This serves as a reminder that these peptides, while targeted, ultimately contribute to the overall homeostasis of an organism, aligning with the notion that supporting one organ can benefit general health.

In summary, the systems-level picture of Testagen is one where a molecular intervention in the testes leads to multi-faceted improvements: hormonal balance, preserved fertility, stable genome transmission, and possibly broader anti-aging benefits. All of this remains within the realm of preclinical investigation, but it provides a tantalizing glimpse of how organ-specific regulators might be used in concert to maintain the health of complex bodily systems.

Conclusion

Testagen has emerged in scientific research as a testis-specific regulatory peptide that exemplifies a novel approach to supporting organ function. Rather than acting like a traditional drug or hormone, Testagen works from within the cell’s genetic machinery to gently maintain or restore normal activity. It serves essentially as a biochemical signal originating from the testes themselves – a sort of molecular whisper that reminds aging or stressed cells how to behave youthfully and optimally. Through modulating gene expression, protecting DNA from epigenetic silencing, and bolstering the testicular cells’ resilience to stress, Testagen helps preserve the structure and function of testicular tissue in experimental models. The scientific significance of Testagen lies in its dual role as a research tool and a proof-of-concept. As a research tool, it allows scientists to delve into the mechanisms of aging, fertility, and cellular regeneration in the male reproductive system. By observing how Testagen normalizes spermatogenesis or hormone production, researchers can identify which genes and pathways are crucial for these processes and how they falter with age. This knowledge expands our fundamental understanding of reproductive biology and endocrine regulation. Testagen also exemplifies a new generation of therapeutic ideas – one focused on epigenetic tuning and transcriptional control rather than blunt force biochemical intervention. It hints at therapies that could one day maintain organ function not by providing external replacements (like giving testosterone or antioxidants), but by reminding the organ to heal and regulate itself via its own genetic programs.

References

[Khavinson V.Kh., Lin’kova N.S., Tarnovskaya S.I. (2016). Short peptides regulate gene expression. Bulletin of Experimental Biology and Medicine, 162(2): 288–292.](https://doi.org/10.1007/s10517-016-3596-7 "Short Peptides Regulate Gene Expression")

[Kuznik B.I., Pateyuk A.V., Rusaeva N.S. et al. (2008). Effect of tetrapeptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the structure and function of the thyroid gland in neonatally hypophysectomized chickens. Bulletin of Experimental Biology and Medicine, 145(1): 104–107.](https://doi.org/10.1007/s10517-008-0033-6 "Effect of tetrapeptides Lys-Glu-Asp-Gly and Ala-Glu-Asp-Gly on the structure and function of the thyroid gland in neonatally hypophysectomized chickens")

[Linkova N.S., Zamoshchina T.A., Zyryanova K.S. et al. (2020). Gene expression in human mesenchymal stem cell aging cultures: modulation by short peptides. Molecular Biology Reports, 47(6): 4323–4329.](https://doi.org/10.1007/s11033-020-05506-3 "Gene expression in human mesenchymal stem cell aging cultures: modulation by short peptides")

[Anisimov V.N., Khavinson V.Kh. (2010). Peptide bioregulation of aging: results and prospects. Biogerontology, 11(2): 139–149.](https://doi.org/10.1007/s10522-009-9249-8 "Peptide bioregulation of aging: results and prospects")

[Khavinson V.Kh., Morozova E.A., Rybnikov V.Y. et al. (2012). Peptides tissue-specifically stimulate cell differentiation during their aging. Bulletin of Experimental Biology and Medicine, 153(1): 148–151.](https://doi.org/10.1007/s10517-012-1664-1 "Peptides tissue-specifically stimulate cell differentiation during their aging")

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This Web Site is generally available to users Twenty-four (24) hours per day, Seven (7) days per week, Three Hundred Sixty-five (365) days per year. However, retains the right to make our Web Site unavailable at any time, for any reason, and for any length of time. By using this Web Site you agree that will not be liable for any damage arising out of or related to any such interruption, suspension, or termination of this Web Site and/or the services or products contained therein. Upon acceptance of these terms and conditions of use authorizes you to view the Content on the Web Site solely for your personal use. The material on the Web Site is intended solely for individuals enquiring about products or services. If you are not accessing the Web Site for such purposes, you may not use the Web Site. For certainty, use by non-individuals or the agents, attorneys or representatives of non-individuals is prohibited.

**Information You Provide

Our collection and/or use of any information you provide while using or visiting this Web Site is governed by the Privacy Policy and this Terms and Conditions of Use Agreement. By using this Web Site you grant us the rights contained therein. In using this Web Site you may not upload, distribute, or otherwise publish on this Web Site any information which may be viewed as obscene, defamatory, libelous, threatening, abusive, illegal, an invasion of privacy rights, or otherwise objectionable, or may constitute or encourage a violation of any law.

Except for that individually-identifiable information collected from you in accordance with our Privacy Policy, all comments, remarks, suggestions, ideas or other information communicated will become the exclusive property of and you grant to a royalty-free, perpetual, irrevocable, world-wide, non-exclusive license to use or reproduce the same. is free to copy, disclose, distribute or analyze any such information for any and all purposes and are in no way obligated to compensate you for any such information.

Disclaimer of Warranties

PROVIDES CONTENT ON THIS WEB SITE AS A SERVICE TO YOU, OUR CUSTOMER. THIS WEB SITE CANNOT AND DOES NOT, CONTAIN INFORMATION ABOUT ALL APPLICATIONS FOR PRODUCTS SOLD. IT MAY NOT CONTAIN ALL INFORMATION THAT IS APPLICABLE TO YOUR PERSONAL CIRCUMSTANCES OR YOUR USE OF PRODUCTS SOLD. THE CONTENT OF THIS WEB SITE, THE WEB SITE SERVER THAT MAKES IT AVAILABLE, AND THE SERVICES AND PRODUCTS PROVIDES ON THIS WEB SITE, ARE PROVIDED ON AN “AS IS” AND “AS AVAILABLE” BASIS WITHOUT WARRANTY OF ANY KIND, WHETHER EXPRESS, IMPLIED OR STATUTORY. EXPRESSLY DISCLAIMS LIABILITY FOR TECHNICAL FAILURES (INCLUDING HARDWARE OR SOFTWARE FAILURES), INCOMPLETE, SCRAMBLED OR DELAYED COMPUTER TRANSMISSIONS, AND/OR TECHNICAL INACCURACIES, AS WELL AS UNAUTHORIZED ACCESS OF USER TRANSMISSIONS BY THIRD PARTIES. FURTHER, DOES NOT REPRESENT OR WARRANT THAT NO VIRUSES OR OTHER CONTAMINATING OR DESTRUCTIVE PROPERTIES WILL BE TRANSMITTED, OR THAT NO DAMAGE WILL OCCUR TO YOUR COMPUTER SYSTEM. YOU HAVE SOLE RESPONSIBILITY FOR ADEQUATE PROTECTION AND BACKUP OF DATA AND/OR EQUIPMENT AND TO TAKE ALL PRECAUTIONS TO SCAN FOR COMPUTER VIRUSES OR OTHER DESTRUCTIVE PROPERTIES. BY YOUR USE OF THIS WEB SITE, YOU ACKNOWLEDGE THAT SUCH USE IS AT YOUR SOLE RISK, INCLUDING RESPONSIBILITY FOR ALL COSTS ASSOCIATED WITH ALL NECESSARY SERVICING OR REPAIRS OF ANY EQUIPMENT YOU USE IN CONNECTION WITH THIS WEB SITE.

TO THE FULL EXTENT NOT PRECLUDED BY APPLICABLE LAW THEIR MEDICAL ADVISORS, SUPPLIERS, CONSULTANTS, DIRECTORS AND EMPLOYEES DISCLAIM AND EXCLUDE ALL WARRANTIES WITH RESPECT TO ALL CONTENT, EXPRESS, IMPLIED OR STATUTORY. THIS DISCLAIMER INCLUDES, BUT IS NOT LIMITED TO, ANY AND ALL WARRANTIES OR MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, AND NON-INFRINGEMENT. DOES NOT WARRANT THE CONTENT TO BE ACCURATE, COMPLETE OR CURRENT. DOES NOT WARRANT THAT THIS WEB SITE WILL OPERATE WITHOUT ERROR, THAT DEFECTS WILL BE CORRECTED OR THAT THIS WEB SITE OR THE WEB SITE SERVER MAKING IT AVAILABLE ARE FREE OF VIRUSES OR OTHER HARMFUL COMPONENTS. PRICE AND AVAILABILITY CONTENT, AS WELL AS OTHER CONTENT CONTAINED IN THIS WEB SITE OR ACCESSIBLE THEREFROM, IS SUBJECT TO CHANGE WITHOUT NOTICE.

YOU ACKNOWLEDGE AND AGREE THAT DOES NOT ENDORSE THE CONTENT OF ANY SITE ACCESSED VIA LINKS OR OTHER MEANS FROM THIS WEB SITE AND IT IS NOT RESPONSIBLE OR LIABLE FOR SUCH CONTENT EVEN THOUGH IT MAY BE UNLAWFUL, HARASSING, LIBELOUS, PRIVACY INVADING, ABUSIVE, THREATENING, HARMFUL, OBSCENE, OR OTHERWISE OBJECTIONABLE, OR THAT IT INFRINGES OR MAY INFRINGE THE INTELLECTUAL PROPERTY OR OTHER RIGHTS OF ANOTHER PERSON.

THIS WEB SITE INCLUDES CONTENT PROVIDED BY THIRD PARTIES AND YOU, OUR CUSTOMER. IS A DISTRIBUTOR OF SUCH CONTENT AND NOT ITS PUBLISHER. EDITORIAL CONTROL OF SUCH CONTENT IS THE SAME AS THAT OF A PUBLIC LIBRARY OR NEWSSTAND. THIRD PARTY SUPPLIERS MAY EXPRESS CERTAIN OPINIONS OR PROVIDE CERTAIN INFORMATION AND OFFERS. MAKES NO WARRANTIES AS TO THE COMPLETENESS, ACCURACY, TIMELINESS, OR RELIABILITY OF INFORMATION OR OFFERS SUPPLIED BY THIRD PARTIES. DOES NOT GUARANTEE OR WARRANT THE PERFORMANCE OF ANY THIRD PARTY, INCLUDING ANY SUCH THIRD PARTY’S CONFORMANCE TO ANY LAW, RULE, REGULATION OR POLICY.

DOES NOT WARRANT THAT INFORMATION, SERVICES, AND PRODUCTS CONTAINED IN THIS WEB SITE WILL SATISFY YOUR REQUIREMENTS OR THAT THEY ARE ERROR OR DEFECT-FREE. BEFORE USING ANY PRODUCT YOU SHOULD CONFIRM ANY INFORMATION OF IMPORTANCE TO YOU ON THE PRODUCT PACKAGING. YOU ASSUME RESPONSIBILITY FOR THE ACCURACY, APPROPRIATENESS AND LEGALITY OF ANY INFORMATION YOU SUPPLY

AS PARTIAL CONSIDERATION FOR YOUR ACCESS TO THIS WEB SITE AND USE OF ITS CONTENT, YOU AGREE THAT IS NOT LIABLE TO YOU IN ANY MANNER WHATSOEVER FOR DECISIONS YOU MAY MAKE OR YOUR ACTIONS OR NON-ACTIONS IN RELIANCE UPON THE CONTENT. YOU ALSO AGREE THAT THE AGGREGATE LIABILITY OF ARISING FROM OR RELATED TO YOUR USE AND ACCESS REGARDLESS OF THE FORM OF ACTION OR CLAIM (FOR EXAMPLE, CONTRACT, WARRANTY, TORT, NEGLIGENCE, STRICT LIABILITY, PROFESSIONAL MALPRACTICE, FRAUD, OR OTHER BASES FOR CLAIMS), IS LIMITED TO THE PURCHASE PRICE OF ANY ITEMS YOU PURCHASED FROM IN THE APPLICABLE TRANSACTION. SHALL NOT IN ANY CASE BE LIABLE FOR ANY DIRECT, INDIRECT, SPECIAL, INCIDENTAL, CONSEQUENTIAL, OR PUNITIVE DAMAGES EVEN IF HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. THIS IS A COMPREHENSIVE LIMITATION OF LIABILITY THAT APPLIES TO ALL LOSES AND DAMAGES OF ANY KIND. IF YOU ARE DISSATISFIED WITH THIS WEB SITE OR ITS CONTENT (INCLUDING TERMS OF USE), YOUR SOLE EXCLUSIVE REMEDY IS TO DISCONTINUE USING THIS WEB SITE. BECAUSE SOME JURISDICTIONS DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES, SUCH LIMITATION MAY NOT BE APPLICABLE TO YOU.

Your Agreement to Abide by All Applicable Laws

By using this Web Site you agree to comply with any and all local, state, or federal laws, statutes, and regulations that relate in any manner to the use of this Web Site and the associated services or products contained thereon.

Relationship between and Users.

and users of our Site are independent contractors, and no agency, partnership, employment or other relationship is created or is intended to be created by the use of our Web Site.

Governing Law and Jurisdiction

This Web Site (excluding linked sites, if any) is administered and controlled by and its affiliates, subsidiaries, officers, directors, employees or agents from its offices in the accordance with the laws of Nevis. You agree that this Terms and Conditions of Use Agreement and this Web Site will be governed by and construed in accordance Nevis law without giving effect to any principles of conflicts of laws. You access this Web Site and/or associated services of at your own risk, and remain responsible for complying with the laws of the jurisdiction within which you are located.

Prices; Payment Terms; Interest

The prices for the products and services on this Web Site are quoted, for convenience, in United States dollars and shall be as set forth in this Web Site as at the time of acceptance of an order by Prices for Products shall be subject to change without any further notice. Credit terms are within sole discretion, and unless otherwise specified in invoice, payment must be received by prior to acceptance of an order.

Consequences

reserves the right to suspend or terminate your account if you violate the Terms of Use Agreement. If your violation causes harm to others, you agree to indemnify and hold harmless from and against any and all loss, damage, or expense. If any dispute arises between us regarding this Agreement or your use of this Web Site, it shall be resolved through good faith negotiations between the parties.

Entire Agreement

These Terms and Conditions and any terms incorporated or referred to herein constitute the entire agreement between and you relating to your use of this Web Site and the subject matter hereof, and supersede any prior understandings or agreements (whether electronic, oral or written) regarding the subject matter, and may not be amended or modified except in writing, or by making such amendments or modifications in accordance with this Terms and Conditions of Use Agreement.

Severability

If any part of this Terms and Conditions of Use Agreement is deemed or determined to be unenforceable, then such part shall be eliminated or limited to the minimum extent necessary. The remainder of this Terms and Conditions of Use Agreement, including any revised portion, shall remain and be in full force and effect. This Terms and Conditions of Use Agreement are the entire agreement between us governing your use of this Web Site.

Headings

The headings contained in this Terms and Conditions of Use Agreement and the Privacy Policy are for reference only.

Force Majeure

shall not be liable for any delay or failure in performance caused by circumstances beyond its reasonable control, including, without limitation, delays due to backorders of requested products, mail delays, customs delays or lost shipments. shall not be responsible to notify the Customer in the event of such delays. The Customer shall be solely responsible to make other arrangements to purchase alternative products and any costs incurred in connection with such purchases.

Thank you again for visiting the Web Site.

Complete Agreement

Except as expressly provided in a particular "legal notice" on this Site, these Terms and Conditions constitute the entire agreement between you and this Site with respect to the use of this Site, and Content. By clicking “I agree” when placing your order, you agree with ALL OF OUR TERMS and CONDITIONS as stated above as well as our Shipping and refunds Policy.

Thank you for your cooperation.

Terms and Conditions of Purchase

Your Use of Our Web Site

Use of Information

DISCLAIMER:

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