Home › Compare › Melanotan II vs Melanotan I
Melanotan II vs Melanotan I
Side by side, in plain English — what each one is, where they overlap and where they genuinely differ.
Melanotan IIAesthetics
Melanotan IAestheticsAt a glance
| Melanotan II | Melanotan I | |
|---|---|---|
| Category | Aesthetics | Aesthetics |
| Typical route | SubQ | SubQ |
| Shelf life once mixed | ~30 days | ~30 days |
| Commonly reported effects | Skin darkening Reduced sun damage Appetite suppression Libido | Gradual skin tanning Skin damage reduction |
| Reported considerations | Nausea Facial flushing Darkening of moles | Mild nausea Rare facial flushing |
The differences that actually matter
Both are classed as Aesthetics peptides, so they get compared constantly and are often researched for overlapping reasons.
Where they overlap: skin darkening, reduced sun damage.
Reported mainly for Melanotan II: appetite suppression, libido.
What Melanotan II is
Melanotan II is a synthetic peptide designed to mimic the actions of alpha-melanocyte-stimulating hormone (alpha-MSH), a naturally occurring pituitary hormone. It functions primarily as a non-selective agonist of melanocortin receptors (MCRs), particularly MC1, MC3, MC4, and MC5 receptors. By activating the MC1 receptor found on melanocytes, Melanotan II stimulates melanogenesis, the biochemical process responsible for producing melanin pigment in the skin. This leads to an increase in both eumelanin and pheomelani
What Melanotan I is
Melanotan I, also known as Afamelanotide, is a synthetic analog of alpha-Melanocyte Stimulating Hormone (alpha-MSH), a naturally occurring peptide in the body. It primarily acts as an agonist for the melanocortin 1 receptor (MC1R), which is predominantly found on melanocytes, the cells responsible for producing pigment. By binding to and activating MC1R, Melanotan I stimulates the process of melanogenesis, leading to increased production of melanin, the pigment that determines skin, hair, and eye color. This peptid
How to compare them for yourself
Anecdotes online are noisy because nobody is measuring the same thing. The only comparison that means anything is your own: log each entry with a timestamp, keep the vial ledger honest so you know what you actually got through, pick two or three metrics before you start, and look at the trend after several weeks rather than day to day.
Peptide Wizard does that part for you — Melanotan II and Melanotan I are both in the built-in reference library with a 3D vial, and your history, vial ledger and cost per entry stay private on your device.
FAQ
What is the difference between Melanotan II and Melanotan I?
Both are classed as Aesthetics peptides, so they get compared constantly and are often researched for overlapping reasons.
Can you log Melanotan II and Melanotan I in the same period?
Plenty of people record more than one peptide at a time. Peptide Wizard keeps a separate vial ledger and entry history for each, so you can see exactly what overlapped and when — it does not recommend combinations or doses.
Which is better, Melanotan II or Melanotan I?
There isn't a universal answer — reported responses vary a lot between individuals, which is why your own log is more informative than anyone else's anecdote. Track one variable at a time and compare your own metrics over several weeks.
Is this medical advice?
No. This page is educational reference material only. It contains no dosing guidance. Speak to a qualified healthcare professional before making any decisions.
See all peptide comparisons →
Educational reference only. This page contains no dosing guidance and is not medical advice.