melanotan health benefits A tan without the sun may sound tempting… but it's important to understand how these injectable tanning peptides actually work. stimulates melanocytes, the cells that produce melanin, leading to darker skin Melanotan II (“Tan Jabs”): Why
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Smoking and alcohol consumption were refuted by the patient, who last consumed alcohol four years ago

Peptides work further upstream, typically by signaling your own body to produce or release something (growth hormone, healing factors, etc.)

Acta Neurol Scand 1985, 72: 129-139
NO signaling through cGMP in renal tissue fibrosis and beyond: key pathway and novel therapeutic target

A randomized, placebo-controlled trial by Bor-Jen Lee et al

saturated molecule / more closely packed / greater surface area (of contact) / not kinked
