Peptides for Depression
Peptides for Depression | What to Know in 2025
For decades scientists and doctors have operated under the premise that a “chemical imbalance” is the underlying cause of depression. The prevailing theory has been that if a person’s serotonin, norepinephrine, or dopamine levels were out of balance then that person would develop depression. It seemed logical then that correcting those levels, usually by raising them, was the best way to treat depression.
The result of the “chemical imbalance” hypothesis was an explosion of selective serotonin reuptake inhibitors (SSRIs), like Prozac and Zoloft, in addition to MAOIs, SNRIs, tricyclic antidepressants, and drugs targeting norepinephrine and dopamine levels. In the early 1990s, these drugs were touted as being 80-90% effective in treating depression and related conditions. As a result, they quickly became some of the most-prescribed drugs in the western world. Unfortunately, these wounder drugs were given far more credit than they were due, perhaps in no small part because people and their medical providers were desperate to have anything they could use to fight back against the symptoms of depression.
As it turns out, more recent studies have shown that drugs like Prozac are no more effective in treating depression than placebo[1]. For a long time, no one wanted to talk about this because, well, there wasn’t much of an alternative. Over time, however, doctors were forced to face the fact that SSRIs and similar drugs simply weren’t up to the task they were developed for. Far from being a nadir in depression research, however, this revelation spurred the development of new hypotheses and resulted in the investigation of multiple new treatments for depression including peptides, electroconvulsive therapy, and even drugs like ketamine.
Peptides for Depression
Neuropeptides, which is to say peptides that are active in the central nervous system, likely play an important role in the etiology and pathophysiology of depression[2]. Research shows that peptides like vasopressin, galanin, neuropeptide Y, and others are critical in the modulation of monoaminergic receptor transmission. In other words, peptides likely provide the underlying control of neurotransmitters like serotonin and dopamine. Thus, the problem of depression is not one of “chemical imbalance,” but rather one of incorrect chemical regulation and signaling.
Neuropeptide systems appear to be involved in several neuropsychiatric conditions, suggesting that there is legitimate physical dysfunction of certain receptors or their ligands that accounts for many neuropsychiatric symptoms. For example, schizophrenia has been tied to alterations in neuropeptides systems including arginine-vasopressin, cholecystokinin, corticotropin-releasing factor, neuropeptide Y, and more[3].
Further adding to the link between peptides and depression is the fact that electroconvulsive treatment (ECT) appears to significantly alter certain peptide levels in the brain. ECT has been shown to have tremendous benefit in the treatment of mood disorders like depression, but because of potential side effects is often limited in use to only refractory, severe cases. Research shows that a number of peptides like neuropeptide Y, galanin, and somatostatin are all impacted by ECT treatment thus suggesting that the real benefit of ECT is in its ability to help the brain regulate neuropeptides[4].
Research into the role of peptides in the treatment of depression is in relatively early stages and there is much to be done, particularly where animal studies are concerned. Still, there is some promising research showing that certain peptides may provide a legitimate, measurable, statistically, and clinically relevant benefit in depression and anxiety. Here is a look at a handful of those peptides.
Ghrelin
Ghrelin, often called the hunger hormone, has a natural anti-depressant effect. It is thought that this peptide, which regulates growth hormone levels and energy balance, rises in response to elevated cortisol levels. Cortisol itself rises in response to stress and thus high cortisol levels are associated with depression and anxiety, though it isn’t clear that cortisol itself is the causative agent in these conditions.
Stimulation of the ghrelin receptor (aka growth hormone secretagogue receptor) has been shown to alleviate depression-like behavior and hypomotility in rats while driving down cortisol levels[5]. Additionally, deletion of ghrelin in mice has been shown to alter tryptophan metabolism. Tryptophan is a precursor to many of the neurotransmitters implicated in the pathophysiology of depression[6], [7]. Ghrelin analogues"), like ipamorelin, GHRP-2, and GHRP-6, may have similar benefits to ghrelin where depression is concerned. Anecdotal evidence suggests this link, but the research has yet to be done. Most of the work on these peptides has focused on their ability to stimulate growth hormone secretion, wound repair, and bone building. It is only recently that more serious attention has been given to their potential effects on the central nervous system.
Melanocyte-Stimulating Hormone-Release Inhibiting Factor (MIF-1)
MIF-1 is a synthetic peptide derived from the c-terminal peptides (proline-glycine-leucine) of oxytocin. First studied in the laboratory of Abba Kastin in 1974, MIF-1 has been shown to have a biphasic effect in the setting of depression. At low levels, MIF-1 causes s significant improvement in the symptoms of depression after a very short period. Higher doses of this peptide do not produce better results, however, but instead seem to impair the anti-depressive effects seen at lower doses. Doses on the order of 0.1 mg/kg have far greater effect than either placebo or higher doses[8]. When given via subcutaneous injection for just 5 days, fully 89% of subjects show substantial improvement on the Hamilton Scale of depression, as compared to just 20% of those given placebo[9]. According to Dr. Kastin, a neuroendocrinologist and early researcher of neuropeptides, the use of peptides to treat depression has shown far greater promise in research settings than any other approach used to date.
Selank
Anxiety and depression are closely related conditions and, often, where one is found the other is diagnosed as well. Research in patients with both anxiety and depression suggests that the inflammatory cytokine IL-6 may play a role in both conditions. IL-6 appears to be particularly important in those who suffer from anxiety-asthenic disorder and other psychosomatic conditions in which nerve pain, fatigue, headache, heart palpitations, and high blood pressure accompany the symptoms of depression and complicate treatment. In fact, IL-6 is of interest in research on fibromyalgia and chronic fatigue syndrome. In both conditions, which have strong elements of depression and which respond to anti-depressives in some cases, IL-6 appears to be elevated[12]. Selank can suppress the expression of the gene responsible for the production of IL-6 and as such is of interest in the treatment of anxiety and depression[13].
Semax
Research has shown that BDNF (brain-derived neurotrophic factor) levels are decreased in people with depression. BDNF is important in the maintenance, survival, and growth of neurons and the synaptic connections between them. It isn’t clear whether lower BDNF levels are a consequence of depression or a cause of depression, but abnormalities in BDNF levels and BDNF receptors have been strongly linked to both depression and suicidality[14].
Enhancement of BDNF levels has been proposed as a potential treatment for depression[15]. Semax, a short synthetic derivative of adrenocorticotrophic hormone (ACTH), has been shown to stimulate BDNF levels in specific areas of the rat brain (e.g. basal forebrain)[16]. Furthermore, administering BDNF to rats increases their exploratory activity and decreases both anxiety and depression-like behavior[17], [18]. There has even been research to suggest that Semax might play a role in the treatment of attention-deficit hyperactivity disorder (ADHD), suggesting that BDNF may be a final common pathway in a number of neuropsychiatric conditions[19].
Peptides for Depression: Summary
As noted above, the research into peptides for depression is in its infancy. This is likely because so much time and so many resources have been devoted to drugs targeting serotonin, norepinephrine, and dopamine. Despite the relative dearth of information on this topic, there is still compelling research to suggest that peptides like ghrelin, MIF-1, and others may offer important clues to the etiology of depression. More than a few animal studies have also suggested that these peptides may offer potent and relatively side-effect-free treatment options for depression, anxiety, and other neuropsychiatric conditions. While more work needs to be done, the research that does exist bodes well for future research into peptides for depression.
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Links from or to websites outside this Web Site are meant for convenience only. does not review, endorse, approve or control, and is not responsible for any sites linked from or to this Web Site, the content of those sites, the third parties named therein, or their products or services. Linking to any other site is at your sole risk and will not be responsible or liable for any damages in connection with linking. disclaims all warranties, express and implied as to the accuracy, validity and legality of any materials or information found on those sites. Links to downloadable software sites are for convenience only and is not responsible or liable for any difficulties or consequences associated with downloading the software. Use of any downloaded software is governed by the terms of the license agreement, if any, which accompanies or is provided with the software.
Availability of Our Web Site
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.
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