7% off all BIOLAB products with code N2
Melanotan II (MT2) is a synthetic peptide - an analog of the naturally occurring alpha-melanocyte-stimulating hormone (α-MSH), which plays a key role in regulating skin pigmentation, appetite, and sexual function. Its defining characteristic is the ability to stimulate melanogenesis - the process responsible for melanin production, the pigment that gives skin a darker tone. This is what made MT2 popular, primarily as a way to darken the skin without prolonged sun exposure.
MT2 also has a notable effect on the nervous system, which may show up as increased libido and the potential to improve sexual function in both men and women. Its effects continue to be studied, but it has not been approved for medical use in most countries, and anyone using it does so at their own risk.
The story of Melanotan II begins in the 1980s, when researchers at the University of Arizona were looking for an effective way to protect the skin from the harmful effects of UV radiation. Their work on synthetic analogs of α-MSH led to the development of Melanotan I, also known as afamelanotide - the first peptide with melanogenesis-promoting properties.
Shortly after, Melanotan II was discovered as a modified version with stronger effects and a longer duration of action in the body. Early testing showed that beyond its ability to induce tanning, MT2 also influences sexual function by stimulating melanocortin receptors in the central nervous system. As a result, interest in the peptide quickly spread beyond dermatology.
Despite promising research results, Melanotan II has not been approved for clinical use due to the lack of long-term safety data.
The compound nonetheless found use in bodybuilding and cosmetic circles as a tool for achieving a fast tan and potentially supporting sexual function.
Today, MT2 is available primarily in experimental form, sold as a powder intended to be reconstituted into a solution for subcutaneous injection. Due to its lack of official registration in most countries, using it involves risk and should be preceded by a clear understanding of the potential side effects.
Melanotan II works by activating melanocortin receptors (MCR), mainly MC1R and MC4R. MC1R is responsible for regulating skin pigmentation, and its stimulation leads to increased melanin production in melanocytes. MC4R, on the other hand, plays an important role in regulating appetite and sexual function, which explains the additional effects observed in people using MT2.
Melanogenesis is the process in which melanocytes produce melanin - the pigment that gives the skin a darker tone. Melanotan II mimics naturally occurring alpha-melanocyte-stimulating hormone (α-MSH), leading to increased melanin production in the skin even without exposure to UV radiation. As a result, people using MT2 may achieve a tan with a much lower dose of sunlight, which in theory may reduce the risk of sunburn and skin damage.
In addition to its effect on skin pigmentation, Melanotan II also acts on the nervous system. Activation of MC4R increases libido and may contribute to improved sexual function, which has been confirmed in animal studies and in some clinical trials. Some users also report reduced appetite, which may potentially support body weight control.
This is why interest in Melanotan II now extends beyond cosmetics - researchers are also studying it in relation to sexual and metabolic disorders. However, the lack of full clinical data means that its use remains experimental.
Melanotan II is primarily used to achieve a tan without prolonged sun exposure. By stimulating melanogenesis, the skin can take on a darker tone even without intense contact with UV radiation. People using MT2 often report faster and more even tanning effects compared with natural sun exposure.
Unlike tanning beds or prolonged sun exposure, Melanotan II works without the need to expose the skin to potentially harmful UV radiation. This may reduce the risk of sunburn, premature skin aging, and skin cancer. However, MT2’s mechanism of action does not completely eliminate the need for sun protection, especially during longer periods of sun exposure.
One of the lesser-known but important effects of Melanotan II is its influence on sexual function. Studies have shown that stimulation of MC4R receptors can increase libido and improve the quality of erections in men. This effect comes from the activation of central mechanisms responsible for sexual arousal.
Some studies suggest that MT2 may be considered a potential alternative to erectile dysfunction drugs such as sildenafil (Viagra), although solid clinical evidence confirming its effectiveness in this area is still lacking. In addition, people on TRT sometimes use Melanotan II at doses around 125 mcg to support libido during periods of temporary sexual dysfunction.
Melanotan II is available in two forms:
Add 2 ml of bacteriostatic water to a vial containing 10 mg of MT2 - this is the standard dilution, where every 0.1 ml of solution corresponds to 0.5 mg (500 mcg) of the peptide. This concentration makes it easy to measure doses accurately with an insulin syringe.
Note: 1 mg = 1000 mcg. MT2 doses are often listed in mcg on forums and in research - keep this conversion in mind to avoid confusing 500 mcg with 500 mg.
Melanotan II dosage is adjusted individually - start with the minimum amount and observe how your body responds.
Timing: MT2 is usually administered in the evening, before bed. The most common side effects - nausea and hot flashes - typically appear within 1-2 hours after injection. Taking it in the evening means you can simply sleep through them.
Example Dosing Schedules
| Week | Dose | Notes |
|---|---|---|
| 1 | 250 mcg (0.25 mg) every other day | Test dose to assess tolerance |
| 2 | 500 mcg (0.5 mg) every other day | Increase only if week one was problem-free |
| 3-4 | 500-750 mcg every other day | Monitor pigmentation and side effects |
Important: Do not exceed 1000 mcg per day in order to minimize the risk of side effects. Start with lower doses and increase gradually based on individual tolerance.
| Dose | User profile |
|---|---|
| 500 mcg once a week | People sensitive to MT2, fair skin, minimal or no side effects during loading |
| 750-1000 mcg once a week | People with darker skin or a weaker response to lower doses during loading |
The maintenance phase can last several months, though it is advisable to take breaks every 8-12 weeks to avoid overstimulation of melanocortin receptors. There are, however, no officially approved guidelines on how long Melanotan II should be used.
Important: The information above is for educational purposes only. Melanotan II is a research compound - there are no officially approved dosing guidelines for human use.
Using Melanotan II in nasal spray form is less invasive, but may come with lower bioavailability. Due to the lack of precise data on the effectiveness and safety of this method, it should be approached carefully, and medical consultation is recommended before use.
If the result shows too small a volume of liquid to measure accurately (for example, less than 1 unit), try increasing the amount of liquid added to the vial (for example, to 2 ml) and calculate again.
WARNING: This online peptide, growth hormone, and hCG calculator is provided for informational purposes only. It does not constitute medical advice or encouragement to use any substance. I accept no liability for the effects or outcomes resulting from the dosing of any selected substance.
Melanotan II, like other peptides, can cause different reactions in the body, especially during the initial phase of use. The most commonly reported side effects include:
The long-term consequences of using Melanotan II are not fully understood because large-scale clinical studies are lacking. Several areas of potential risk have been identified:
Due to the lack of comprehensive clinical data on Melanotan II, it cannot be stated with certainty that it is a completely safe substance. Its use is at the user’s own risk, and anyone considering it should consult a doctor and regularly monitor their health, especially if they notice concerning skin changes or other side effects.
The following principles can help reduce the risk of adverse effects:
Melanotan II should not be used by anyone who has even one of the following:
If you are unsure whether any of the above applies to you, consulting a doctor before the first use of MT2 is not optional.
Melanotan I and Melanotan II are synthetic peptides developed as analogs of alpha-melanocyte-stimulating hormone (α-MSH), but they differ in several important ways, including their mechanism of action, side effect profile, and intended use.
In short: Melanotan I is the safer option and is approved in the EU. Melanotan II works faster and more strongly, but it is not approved as a drug and carries a higher risk.
Melanotan II (MT2) is a synthetic analog of α-MSH and has been the subject of numerous scientific studies. Below are the key studies on MT2 and their main findings.
Wessells et al. (2000): Wessells and colleagues evaluated the effect of MT2 on erectile function in men with erectile dysfunction. The results showed that MT2 can induce erections through central stimulation of melanocortin receptors, suggesting its potential use in the treatment of erectile dysfunction.
Emanuele et al. (2007): In a pilot study, Emanuele and colleagues assessed the efficacy of MT2 in men with psychogenic erectile dysfunction. The study showed that MT2 may be effective in inducing erections in this patient group, pointing to its therapeutic potential in the treatment of psychogenic sexual dysfunction.
Dorr et al. (1996): Dorr and colleagues evaluated MT2’s ability to induce skin pigmentation in humans. Participants received low doses of MT2 every other day for a defined period. The results showed that MT2 effectively increased skin pigmentation, confirming its potential as a tanning aid.
Langan et al. (2021): In a study published in 2021, Langan and colleagues analyzed MT2 user experiences based on posts from online forums. Users reported both positive effects, such as increased skin pigmentation and improved libido, and negative side effects, including nausea, facial flushing, and spontaneous erections. The study points to the need for further research into the safety and side effect profile of MT2.
This article is for informational purposes only and does not constitute medical advice. The information presented here is based on available research and scientific publications, but it does not replace consultation with a doctor or another qualified specialist. The use of Melanotan II involves risk and should be undertaken with full awareness of the potential side effects and in accordance with applicable law.
Melanotan II has not been approved for medical use by any major regulatory agency, including the FDA (U.S. Food and Drug Administration) or the EMA (European Medicines Agency). In most countries, it is treated as a research compound and cannot be legally sold as a consumer-use product. Despite this, Melanotan II is widely available online, marketed primarily as a product for research purposes.
The author of this article accepts no responsibility for any actions taken based on the information provided here. Any decisions regarding the use of this substance should be made after consulting a doctor and analyzing individual needs and health risks.
Use Biolab discount code N2 and get 7% off sitewide across all Biolab stores.
Enter code N2 at checkout to save 7% on your order. The code is available for regional Biolab stores, including the UK, USA, Canada, European, German, Spanish, French, Italian and Latvian stores.
Comments
Number of comments: 0