Reviewed by the PeptideMind Team · Updated July 15, 2026
Melanotan II Dosage Guide, Benefits & Side Effects
Melanotan II drives melanin synthesis for tanning and showed pro-erectile effects in Phase II trials, alongside appetite-suppressing research.
Chemical Makeup
7
Amino Acids
Melanotan II
?
XPosition 1
Asp
DPosition 2
His
HPosition 3
Phe
FPosition 4
Arg
RPosition 5
Trp
WPosition 6
Lys
KPosition 7
As seen on
Melanotan II Dosage Guide for Skin & Sexual HealthMelanotan II Dosage Calculator
Melanotan II triggers your skin to tan and offers some protection from UV rays by activating a pigment-producing pathway. People typically use it daily until they reach the tan they want, then cut back to a couple of times a week to maintain it.
Vial size
10 mg
Bacteriostatic water
3 mL
Dosing
250–500 mcg
Frequency
Daily
Cycle
2–4 weeks
Benefit
Skin & Sexual Health
What is Melanotan II?
Melanotan II is a lab-made peptide related to a natural skin-pigment hormone, but it acts more broadly across several hormone receptors in the body. It was originally created to help prevent skin cancer by darkening skin without needing sun exposure, but researchers also noticed it affects sexual desire, leading to studies on its use for low libido and sexual arousal issues. It's used both in formal research and by people self-administering it for tanning or sexual enhancement effects.
Skin
MT-2
Sexual
Is Melanotan II FDA approved?
Melanotan II is not an FDA-approved drug. It is intended for research purposes only and is not approved for human consumption, diagnostic, or therapeutic use.
Research Use Only
Melanotan II has not been evaluated by the FDA for safety or efficacy in humans.
No Clinical Oversight
Not manufactured under FDA-regulated quality or clinical standards.
Unregulated Sourcing
Purity, dosing, and sourcing are not verified through FDA testing or oversight.
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How Does Melanotan II Work?
It attaches loosely to several related pigment-and-appetite receptors throughout the body rather than just one, switching on the same internal signal in each case. One receptor drives skin darkening, while another, active in the brain, affects sexual arousal and appetite.
Loosely binds several receptors
Attaches to multiple related pigment-and-appetite receptors, not just one.
Darkens skin
One receptor drives skin pigmentation.
Affects arousal & appetite
Another, active in the brain, affects sexual arousal and appetite.
Melanotan II Targeted areas
How to reconstitute Melanotan II
View guideThe materials you'll need and step-by-step instructions for safely mixing Melanotan II with bacteriostatic water.
Materials needed
Your Melanotan II vial (lyophilized)
Alcohol swabs
Bacteriostatic sterile water
3 mL syringes (Luer Lock tip)
25G or 27G needles (Luer Lock). Other gauges may also be acceptable.
Sharps container (optional)
Remove the caps
Sanitize the rubber stoppers
Attach the needle
Draw the bac water
Pull back on the plunger to draw your desired volume of bacteriostatic water. If you overfill, just push the excess back in until you reach the right marker on the syringe.
Insert the needle into the Melanotan II vial
With the bac water in your syringe, insert the needle into the Melanotan II vial at a slight angle to avoid pressure buildup.
Release the water gently
Let the water run gently down the side of the vial. Don't inject it forcefully.
Swirl to dissolve
Avoid shaking. Gently swirl, flip, and roll the vial to dissolve the powder.
Check for full dissolution
Cap, dispose, and store
How to Store Melanotan II
Freeze the dry powder for up to two years, or it can sit at room temperature for a few weeks. Once mixed with liquid, refrigerate and use within two weeks, avoiding repeated freezing and thawing.
Lyophilized Storage
-20°C (stable up to 24 months), or room temperature for up to 3 weeks.
Reconstituted Storage
2–8°C, use within 14 days.
Handling Notes
Avoid repeated freeze-thaw cycles.
What Are the Benefits of Melanotan II?
What research says it may help with, and how it works in the body.
skin health
Triggers the skin's own pigment production to create a tan without needing sun exposure.
More skin pigment acts like natural sun protection against sun damage.
May help with certain skin conditions involving uneven or abnormal pigment.
sexual health
In studies on erectile dysfunction caused by psychological factors, 80% of participants responded positively.
In clinical trials, 73% of women reported feeling arousal within 24 hours.
Increases sexual desire in both men and women by activating a receptor in the brain that governs arousal.
metabolic
Activates a receptor in a brain region that controls hunger, reducing appetite by about 15% in studies.
Increases fat burning by switching on the body's fat-metabolizing processes.
What Are the Side Effects of Melanotan II?
Who should avoid it, warning signs to watch for, and what to know before combining it with other compounds.
Who Should Avoid It
History of melanoma or dysplastic nevi
Pregnancy or breastfeeding
Cardiovascular conditions
Uncontrolled hypertension
Stop Right Away If You Notice
Severe persistent nausea or vomiting
Chest pain or significant blood pressure elevation
Mole changes (size, shape, color) - monitor closely
Prolonged painful erections (priapism)
Severe headaches or vision changes
Allergic reactions (rash, swelling, breathing difficulty)
Milder Signs to Watch For
How Long Should a Melanotan II Cycle Last?
This breaks down how long a typical Melanotan II cycle runs and what research suggests happens at each stage. Research shows that staying on a peptide continuously, without a break, may make it less effective over time.
That's why most research protocols build in a break between cycles, often called a washout period, to let the body reset before starting again.
- Day 1-3
- Possible nausea, flushing, fatigue
- Day 3-7
- Increased spontaneous erections (men), enhanced arousal
- Week 1-2
- Noticeable skin darkening, reduced appetite
- Week 2-4
- Significant tanning, stabilized sexual effects
- Week 0-0
- Maintained tan with less frequent dosing
Cheat Sheets Featuring Melanotan II
See how Melanotan II fits into a broader research stack with these free downloadable cheat sheets. Each one includes reference dose ranges, dosing frequency, and half-life for every peptide it covers. For research purposes only.
Melanotan II Research References
It is a preclinical compound
Melanotan II
Melanotan II is a preclinical compound
0.16mg/kg daily for 10 days increased eumelanin and achieved natural tan without UV exposure.
1999
Single dose of 0.025mg/kg resulted in 73% of premenopausal women reporting arousal within 24 hours.
2004
0.025mg/kg dose achieved 80% response rate with significant improvement in psychogenic ED over 3 months.
2000
Frequently Asked Questions About Melanotan II
Straight answers on reconstitution, dosing, and safety, everything you need to research with confidence. For research reference only.