Synthetic melanotropin for skin pigmentation with libido and appetite effects
Originally developed to help skin tan without sun exposure, this synthetic peptide is a modified version of naturally occurring hormones. Because it interacts with several different receptors, it also has a notable impact on food intake and libido.
Quickstart Highlights
- Dosage: 250-500mcg
- Frequency: Daily during loading, then maintenance
- Administration: Subcutaneous
- Cycle length: Loading 2-3 weeks, then maintenance
Dosing Plan
| Weeks | Dose | Units |
|---|---|---|
| Day 1 (Tolerance Test) | 100mcg once | 2 units (0.02mL) from 5mg/mL |
| Loading Phase (Weeks 1-3) | 250-500mcg daily | 5-10 units (0.05-0.1mL) |
| Maintenance | 250-500mcg 1-2x weekly | As needed to maintain tan |
| Before Sun Exposure | 250mcg 2-4 hours before UV | Enhances tanning response |
How to mix
2ml BAC water per 10mg vial
- Draw 2.0mL bacteriostatic water with a sterile syringe.
- Inject slowly down the vial wall.
- Gently swirl until completely dissolved.
- Label with date. Concentration = 5mg/mL.
- Refrigerate at 2–8°C. Use within 4-6 weeks.
Syringe Math Reference
- 10mg vial with 2mL BAC water = 5 mg/mL = 5,000 mcg/mL
- 100mcg dose = 2 units (0.02mL)
- 250mcg dose = 5 units (0.05mL)
- 500mcg dose = 10 units (0.1mL)
What you'll need
Melanotan II Vials (10mg)
- Loading (3 weeks) 1-2 vials
- 3 months maintenance 2-3 vials
- 6 months 3-4 vials
Insulin Syringes (U-100)
- Loading 21 syringes
- 3 months 35 syringes
- 6 months 50 syringes
Bacteriostatic Water (10mL)
- Per vial 1 bottle
- 3 months 1 bottle
- 6 months 1 bottle
Alcohol Swabs
- Loading 1 × 100-count box
- 3 months 1 × 100-count box
- 6 months 1 × 100-count box
How This Works
Melanotan II is a synthetic analog of alpha-melanocyte stimulating hormone (α-MSH) that activates melanocortin receptors (MC1R through MC5R). MC1R activation stimulates melanocytes to produce melanin, resulting in skin darkening. MC3R/MC4R activation in the brain increases sexual desire and reduces appetite. The broad receptor activation profile accounts for its multiple effects beyond tanning.
Melanotan II works by mimicking your body's natural hormones to activate different receptors. It triggers the pigment-making cells in your skin, signals your brain to lower your appetite, and supports the pathways responsible for sexual arousal.
Mechanism of Action
How Melanotan Works in Your Body
Peptide Administered
Subcutaneous injection into fatty tissue
MC1R Binding
Activates melanocortin-1 receptors in skin
Melanin Production
Melanocytes produce more eumelanin pigment
Skin Darkens
Natural tan develops with minimal UV exposure
Benefits & Side Effects
Potential Benefits
- Rapid skin tanning with minimal UV exposure
- Reduced sunburn risk once tanned
- Significant libido enhancement
- Appetite suppression and potential weight loss
- Long-lasting effects (weeks to months)
- Low maintenance dosing after loading phase
Potential Side Effects
- Nausea (very common initially - dosing before bed helps)
- Facial flushing
- Darkening of moles and freckles
- Spontaneous erections in males
- Fatigue and yawning
- Rare: new mole formation
- Rare: darkening of skin in unexpected areas
How to store it
- Lyophilized: Store refrigerated or frozen for long-term stability.
- Reconstituted: Refrigerate at 2–8°C; use within 4-6 weeks.
- Protect from light - Melanotan II is photosensitive.
- Do not freeze reconstituted solution.
Good to know
- Start with 100mcg tolerance test dose - nausea is very common initially.
- Taking before bed significantly reduces nausea side effects.
- Minimal UV exposure needed for tanning effect - avoid sunburn.
- Will darken existing moles and freckles - monitor for changes.
- Has significant libido-enhancing and appetite-suppressing effects.
- NOT the same as Melanotan I (Afamelanotide) which is more selective.
- Effects persist for weeks/months after discontinuation.
- Regular dermatological mole checks recommended.
References
Research Studies
Melanogenesis Stimulation
PreclinicalStudies show Melanotan II activates melanocortin-1 receptors to stimulate melanin production independent of UV exposure.
View sourceSexual Function Effects
PreclinicalResearch demonstrates melanocortin receptor activation by Melanotan II has effects on sexual arousal through central nervous system pathways.
Interactions & Stacking
PT-141 was derived from Melanotan II research. Both activate melanocortin receptors.
Questions people ask
Melanotan II activates MC1 receptors in skin cells, stimulating melanin production (melanogenesis) which darkens the skin with or without UV exposure.
Loading typically starts at 0.25mg daily, increasing to 0.5-1mg daily until desired tan is achieved (usually 2-4 weeks), then maintenance 1-2x weekly.
Common side effects include nausea, facial flushing, fatigue, and darkening of moles. Starting with low doses helps minimize side effects.
Community Insights
Summarised from 3 sourcesSynthetic melanotropin for skin pigmentation with libido and appetite effects Start 100mcg to assess tolerance. Avoid sun during peak hours. Monitor moles
Common Dosages Reported
- 250-500mcg Daily during loading, then maintenance
- Standard protocol dosing
Side Effects Mentioned
- Generally mild, individual variation expected
- See full guide for detailed safety info
Stacking Suggestions
- Consult research and healthcare provider before stacking
What people are saying
Results vary based on individual response
Consistent dosing and timing important
Reviews & Discussion
Real experiences shared by the community — not medical advice.
Depression and Lethargy After Long-term Use
A user reported experiencing moderate to severe depression, lethargy, and a loss of interest in activities after using Melanotan II for several years. They expressed concern that prolonged use of the peptide may have negatively impacted their brain's dopamine production or receptivity.
Improved ADHD Symptoms and Focus
A user noted that using Melanotan II significantly improved their ADHD symptoms, including focus and energy levels. They hypothesized that the peptide's interaction with melanocortin receptors may have a positive effect on dopamine signaling.
Effective Tanning and Increased Libido
A user shared his experience using a dosage of 1mg per day for a 10-day loading phase, followed by 1mg twice a week for maintenance. He reported getting very dark with minimal sunlight and noted that the peptide significantly increased his libido.
Increased Mole Size and Darkening
A user issued a warning regarding Melanotan II after experiencing an alarming increase in the size and darkness of his moles. He also reported that the peptide caused his facial hair to turn black, which he found concerning enough to stop usage.
Significant Hair Pigmentation Changes
A user reported that using Melanotan II significantly altered his appearance by turning his beard completely black. While he was surprised by the dramatic change in hair pigmentation, he seemed satisfied with the result.
Libido and Appetite Effects
A long-term user taking the peptide for seven months highlighted significant non-tanning benefits, specifically reporting libido enhancement at 1.5mg per day and appetite suppression (anorexic properties) at 2mg per day. They occasionally take two-week breaks but have used it largely continuously.
Flushing and Nausea Concerns
A user experienced immediate side effects after a single 0.25mg injection, including red body flushing for 30 minutes, mild nausea, and lethargy. They also observed the potential emergence of new spots or moles, prompting them to suggest even lower starting doses of 0.12mg.
Tanning Success and Dose-Dependency
A user reported good initial success with Melanotan II for tanning, starting at a low dose of 0.5mg twice weekly. They noted that the tanning effect becomes more dose-dependent over time, requiring higher amounts to maintain results after several months of use.
Melanotan II for Libido and Appetite Suppression
A user testing Melanotan II for libido reported immediate facial flushing and strong stomach cramps following a 0.5 mg dose. While they noted significant appetite suppression and a slight 15% boost in libido, they did not experience the spontaneous erections typically associated with the peptide.
Melanotan II vs Melanotan I for Multi-Benefit Use
A long-term user recommends Melanotan II over Melanotan I, though they cautioned that it can be "too strong" for tanning. They noted the peptide provides significant benefits beyond skin pigmentation, specifically regarding sexual health.
Sleep Activation and Tanning Side Effects
A user noted that Melanotan II is effective for libido but warned it can cause excessive tanning if the user spends time in the sun. They recommended starting at a low dose under 500 mcg and mentioned that many users find the effects only truly "activate" after sleeping.
Dosing Protocol and Sexual Side Effects
A user shared a protocol of 250mcg to 500mcg several times per week, noting that results are better when combined with sun exposure to avoid an artificial 'makeup' look. They cautioned that the peptide can cause intense, persistent erections and recommended starting with lower doses before bed to manage nausea.
Rapid Tanning and Flushing Side Effects
A user reported that the peptide causes rapid and significant darkening of the skin, though it also darkens existing moles and freckles. They experienced temporary side effects including facial flushing and slight nausea that typically subsided within an hour.
Persistent New Mole Formation
A long-term member warned that the use of this peptide can lead to the appearance of new moles that do not dissipate after discontinuing use.
Efficacy and Facial Hair Darkening
A user reported that their vial of Melanotan II remained effective for 3 to 4 months of use. They eventually stopped using the peptide due to the unwanted side effect of darkening their facial hair.
Anhedonia and Loss of Libido
A user noted that for a small number of people, Melanotan II can induce complete anhedonia and kill sex drive. This was highlighted as an unusual reaction given the peptide's typical associations with increased libido.
Worsening of Depression symptoms
A user reported that their depression significantly worsened while using Melanotan 2 several years ago. They noted that increased depression has been reported by others using this peptide.
Effective Low-Dose Regimen
A user reported achieving great results by dosing between 0.5mg and 1.0mg twice per week. They supplemented the regiment with limited outdoor tanning sessions to achieve their desired tan.
Long-term Historical Success
A user shared a past experience where the peptide resulted in a very deep, dark tan. The protocol involved the use of tanning beds alongside the peptide administration.
Long-term Melanotan II Use and Potential Dopamine Issues
A user reported experiencing potentially long-term neurological issues after two years of Melanotan II use, including severe anhedonia and a loss of response to various substances like caffeine and alcohol. They expressed concern that the peptide may have negatively impacted their dopamine system or caused receptor downregulation.
Melanotan II for ADHD Symptoms
A user noted that using Melanotan II significantly improved their ADHD-PI symptoms, providing better focus and mental clarity than traditional ADHD medications. They suggested the peptide's action on melanocortin receptors likely plays a role in its cognitive-enhancing effects.
Melanotan II for Melanin Expression and Tanning
A user stated that Melanotan II is the most effective way to increase melanin expression and achieve a tan without excessive UV exposure. They warned of side effects such as nausea and increased libido, but emphasized its potency for skin pigmentation.
Highly effective for tanning and sun protection
A user shared their positive experience with Melanotan II, describing it as the greatest thing ever for achieving a tan. They noted that it effectively prevents sunburns and allows them to maintain a deep tan with minimal effort.
Significant darkening of facial hair and freckles
A user reported that Melanotan II significantly darkened their facial hair, turning a brown and grey beard completely black. They also noted that the peptide caused their freckles to become much darker.
Warnings regarding mole and freckle changes
A user shared a warning about Melanotan II, noting that while it is effective for tanning, it can cause existing moles to become much larger and darker. They also experienced the emergence of many new, dark freckles across their body.
Flushing, Nausea, and Pigmentation Concerns
A user experienced immediate side effects after a single 0.25mg injection, including full-body flushing for 30 minutes, mild nausea, and lethargy. They also expressed concern about the potential appearance of new skin spots or moles shortly after administration.
Sustained Tanning and Libido Enhancement
A user reported good initial success with a low starting dose of 0.5mg twice weekly. Over seven months of use, they noted that while tanning results became more dose-dependent, a dose of 1.5-2mg twice weekly successfully maintained their tan and provided libido enhancement.
Dose-Dependent Effects and Tolerance
A long-term user noted that the peptide's effects vary by dosage, experiencing libido enhancement at 1.5mg and anorexic (appetite suppression) properties at 2mg. They observed that tolerance can develop, requiring higher doses over time to maintain the same tanning results.
Libido Benefits with Sleep Activation and Tanning Side Effects
A forum member noted that both Melanotan II and PT-141 are effective for libido, though they personally find them both to work best after sleeping. They warned that Melanotan II causes excessive tanning if the user is exposed to the sun and recommended starting at a low dose under 500 mcg to manage effects.
MT2 Recommended Over MT1 for Combined Benefits
A well-known member recommended Melanotan II over Melanotan I, though they cautioned that it is "too strong" for tanning purposes alone. They suggested it has distinct benefits beyond skin pigmentation, implying effectiveness for sexual health goals.
Mixed Results for Libido with Significant Nausea and Appetite Suppression
A user testing Melanotan II for libido reported experiencing facial flushing and strong stomach cramps within five minutes of their first 0.5 mg dose. While they noted a slight libido increase of about 15% and significant appetite suppression, they did not experience the spontaneous erections typically reported by other users.
Permanent New Mole Development
A long-term forum member warned that using Melanotan II can lead to the appearance of new moles that do not fade over time. This observation was shared as a cautionary note for first-time users.
Rapid Tanning with Temporary Side Effects
A user reported that Melanotan II induces rapid and deep tanning, though it can cause temporary flushing and nausea lasting about an hour after injection. They noted that the peptide also darkens existing moles and freckles, making it easy to accidentally become too dark.
Effective Low-Dose Protocol and Sexual Side Effects
A user shared their experience starting with 250mcg dosages three to four times per week, eventually increasing to 500mcg before sun exposure. They reported effective tanning and emphasized the potential for strong, spontaneous erections as a side effect.
Anhedonia and Loss of Libido
A user reported that Melanotan II can induce complete anhedonia and a loss of sex drive in a small subset of individuals. This psychological side effect was noted as being unexpected given the peptide's usual association with increased libido.
Worsening of Depression
A user shared that their depression significantly worsened while using Melanotan II several years ago. They noted that the peptide has been reported by others to increase depressive symptoms.
Efficacy and Shelf Life
A user reported that their vial of Melanotan II remained effective for at least three to four months of use. They noted that the peptide maintained its potency throughout that duration before they decided to stop using it.
Effective low-dose regimen with outdoor tanning
A user reported success using Melanotan II at dosages between 0.5mg and 1.0mg twice a week. They supplemented the peptide with occasional outdoor tanning sessions and found the results to be highly effective.
Significant darkening with tanning bed use
A user shared a past experience where the peptide resulted in a very deep and dark tan. The protocol involved utilizing tanning beds concurrently with the administration of the substance.
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