Compare · Head-to-head
Melanotan I vs Melanotan II.
Evidence, risk, regulatory flags, cost, and vendor coverage compared side by side. We don’t sell peptides — we help you choose between them.
Which should you research first?
Start with Melanotan I, then use the table to confirm fit.
Melanotan I is the cleaner first read based on the current evidence, risk, and regulatory data stored for this pair. The right answer can still change if your goal, sport testing status, vendor constraints, or monitoring tolerance makes the other option a better fit.
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01· Subject
Melanotan I
FDA-approved MC1R agonist (SCENESSE implant) for erythropoietic protoporphyria. Prescription only.
01 · At a glance
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Primary fit | skin & hair research where you want a clear starting point | skin & hair and sexual health & libido comparisons |
| Evidence | Tier A | Tier C |
| Risk | medium | high |
| Experience level | advanced | advanced |
| Budget tier | premium | budget |
| Administration route | subcutaneous implant | subcutaneous |
02 · Use case & timing
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Goal fit | Skin & Hair | Skin & Hair, Sexual Health & Libido |
| What users compare it for | Phototoxicity reduction in EPP (evidence-backed). Cosmetic tanning is not the approved use. | Pigmentation changes (tanning); sexual arousal effects. NOT a controlled therapeutic product. |
| Onset timeline | Controlled-release kinetics; plasma concentrations up to ~96 hours in most subjects. | Pigmentation changes can occur quickly; adverse events can be acute. |
| Main tradeoff | Evidence is stronger than most compounds in this category, but route, side effects, and vendor fit still matter. | Potential upside comes with much more safety and screening caution than lower-risk alternatives. |
03 · Safety & restrictions
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Adverse effects | Hypersensitivity, implant site reactions, pigment changes, monitoring for pigmented lesions. | FDA cites serious adverse events: melanoma, posterior reversible encephalopathy syndrome, sympathomimetic toxidrome, priapism. Immunogenicity/impurity concerns. |
| Contraindications | Hypersensitivity to afamelanotide (per label). | High risk across the board; unlicensed and unapproved. |
| Interaction notes | No drug interaction studies were conducted (per label). | Unknown; risk may increase with UV exposure behaviors and stimulant-like exposures. |
| Regulatory status | Prescription-approved | Not approved |
| FDA flag | No current flag noted | FDA compounding caution |
| WADA status | Status unclear | Status unclear |
04 · Age & monitoring
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Supported age ranges | No age guidance yet | No age guidance yet |
| Life-stage note | Not yet documented | Not yet documented |
| Monitoring burden | Not specified | Not specified |
| Follow-up cadence | Not yet documented | Not yet documented |
05 · Cost & sourcing
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Typical cycle cost | No reliable estimate yet | $80.00 |
| Estimated monthly cost | No reliable estimate yet | $53.33 |
| Cost confidence | No estimate | High confidence |
06 · Before you buy
| Decision factor | Melanotan I | Melanotan II |
|---|---|---|
| Tracked vendor listings | 2 listings | 3 listings |
| Sourcing note | Tracked product pages are available, which makes it easier to review the listing before you click out. | Product format varies by listing, so double-check route, concentration, and presentation. |
| Stack-friendly? | Better as a standalone decision | Usually stack-friendly |
Sources and review notes
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks - U.S. Food and Drug Administration - accessed 2026-05-15
Used for FDA compounding-risk context and peptide safety flags.
- The Prohibited List - World Anti-Doping Agency - accessed 2026-05-15
Used for athlete-facing WADA risk and peptide-class restrictions.
- Peptide therapeutics: current status and future directions - PubMed / Nature Reviews Drug Discovery - accessed 2026-05-15
Used for broad peptide-therapeutics background and evidence framing.
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