.@​bryan_johnson on Melanotan, the viral peptide that darkens your skin: "A few people have done it and I think they haven't come back." "The color isn't prek

.@​bryan_johnson on Melanotan, the viral peptide that darkens your skin: "A few people have done it and I think they haven't come back." "The color isn't preknown, it just emerges." "It's not like you put your finger on a chart and say, 'I want this color with this dose.'" [▻](https://video.twi…