Common reasons Not getting any UV exposureMT-2 produces melanin but you need some UV to 'activate' it and see the tan Degraded peptide from improper storagecheck if solution is clear and properly refrigerated Dose too lowsome people need the full 500mcg to see results Unrealistic expectationsMT-2 won't make you darker than your genetic potential allows Not enough timefull results take 2-4 weeks of consistent loading Poor quality peptide from unreliable sourcealways verify with third-party testing (COA) Key Research [1]"Evaluation of melanotan-II, a superpotent cyclic melanotropic peptide, in a pilot phase-I clinical study" Dorr RT, Lines R, Levine N, Brooks C, Xiang L, Hruby VJ, Hadley ME, 1996 Finding: Pilot phase-I human study: subcutaneous melanotan-II induced measurable skin tanning in healthy male volunteers after only 5 low doses (every other day), with pigmentation increasing in the face, upper body and buttocks

This information may help provide context for provider conversations about which formulation and dose strategy could align with an individual's genetic profile, though genetic variants do not predict exact medication response
Baettig SJ, Filipovic MG, Hebeisen M, Meierhans R, Ganter MT
About half the people who have melanoma have changes in this gene, which helps cancer cells grow
The result: balanced appetite cues and everyday metabolic wellness, all powered by nutritionnot drugs.*
these findings require replication in appropriately-powered randomized designs