Supplementing tanning bed sessions with regular sun exposure secured him a solid char that helped contour his hard-earned muscles. Along with visits to the tanning bed, the peptide, called Melanotan-II, gave him the roasted-marrow tan he still has today. Users claim the peptide gives them a leaner appearance, obscures blemishes, evens out their skin tone, and makes their teeth look whiter. Others opt for MT1, a related peptide that also promotes skin-darkening but doesn’t make you hornier or less hungry. Like most biohacking peptides, MT1 and MT2 are not approved by the FDA, and are illegal to sell for human consumption.