The peptide revolution: inside the injectables industry Understanding Peptides: Viral 'Barbie drug' for tanning can cause brain swelling and even cancer, experts warn Melanotan peptide might seem like the cool thing to doit makes you look tan., But these unregulated injections come with real risks., They can cause unpredictable skin changes, including darkening of You may have heard about the latest trend tanning nasal sprays and injections. So how does it work and is it safe? Refs: Fjellhaugen Hjuler et al., 2014, Melanoma associated with the use of