Long post, sorry. Melanotan II: what actually has human evidence behind it, and what is extrapolation from animals?
Mechanism is not outcome, and a plausible pathway is the most expensive kind of evidence there is.
Cold storage, light protection, and a date on the vial. Boring, and it removes half the variables.
I would rather have a narrow conclusion and be right than a broad one and be interesting.
Injection site reactions are trivial until they are not, and a fresh needling technique removes half of them.
Where does the human data stop and the extrapolation start?
If it needs three other compounds to notice, you have not tested the first one.
Narrow conclusion, briefly right. Broad conclusion, interestingly wrong. I know which I keep choosing. How long have you been on melanotan II?
I would take the narrow conclusion. Broad ones are more interesting and less true.