Peptides for skin, hair and tanning
The cosmetic end of the category — and, unusually, one where topical formulations have real controlled human data behind them.
Ranked by strength of evidence
- SGHK-Cu
Topical GHK-Cu improves skin appearance (wrinkles, density, firmness)
Human studies on the topical form — the strongest cosmetic evidence here.
Read the evidence → - SMelanotan II
Causes skin tanning with little or no UV exposure
It demonstrably works. Whether it is safe is a separate claim, graded separately.
Read the evidence → - A
The honest read
This is the one category where you can buy a cosmetic peptide over the counter and have real human data behind it — but note that the evidence attaches to the topical formulations, not to injecting the same molecule.
Looking at a different goal? Browse all use cases, or get every peptide’s grade on one page.