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

Take it for veterinary evaluation and give vitamin b12 injection for dogs according to instructions given by the vet
Human intervention in TMAO can reduce the risk of cardiovascular disease in CKD patients (Ravid et al., 2021)
Understanding how each one is studied and what researchers are actually looking at gives you a much clearer picture than the usual surface-level comparisons