Popular peptides
The ingredients that show up again and again in serums, eye creams, scalp treatments, and supplement aisles.
Melanotan II
A synthetic melanocortin peptide originally developed for tanning—now notorious for unregulated online sale.
PT-141
A melanocortin receptor agonist approved as Vyleesi for hypoactive sexual desire in women.
AOD-9604
A fragment of human growth hormone studied for fat loss without IGF-1 effects.
DSIP
A neuropeptide isolated in 1977 and studied for sleep architecture and stress response.
hGH Fragment 176-191
The lipolytic piece of growth hormone—marketed for fat loss in research markets.
hCG
A glycoprotein hormone peptide—not a small peptide—used medically for fertility and sometimes TRT adjunct.
Oxytocin
A nine-amino-acid neuropeptide famous for social bonding—also studied as a nasal spray for autism and anxiety.