Afamelanotide
Scenesse · Melanotan-1 · Melanotan I
Approved for a rare light-sensitivity disorder. Frequently confused with Melanotan II, which is a different molecule and is not approved anywhere.
Studied for skin and hair
22
Registered trials
Thymosin β4
Tβ4 · TB4 full protein
The full protein, distinct from the TB-500 fragment sold online. Real research programme — mostly eye drops and wound healing.
Studied for skin and hair
18
Registered trials
GHK-Cu
Copper peptide
One of the few where the trials roughly match the marketing — skin. The hair-growth claims are not what's being tested.
Studied for skin and hair
2
Registered trials
LL-37
Cathelicidin · hCAP18 fragment
The body’s only cathelicidin antimicrobial peptide. Two registered trials — and published human trials that were never registered.
Trials, but not for skin and hair
2
Registered trials
TB-500
Thymosin Beta-4 fragment
The one human trial under this name is a heart study. Not a single registered trial tests it for the injury recovery it's sold for.
Trials, but not for skin and hair
1
Registered trials
Melanotan II
MT-2
One registered human trial, for vitiligo — not the tanning or libido uses it is sold for.
Trials, but not for skin and hair
1
Registered trials
KPV
Lysine-Proline-Valine · alpha-MSH 11-13
An alpha-MSH fragment marketed for inflammation and gut health. Zero registered human trials.
No registered trial
0
Registered trials
—Read this
Marketed for is not tested for
A compound can be sold for skin and hair and studied for something else entirely — that is the most common pattern on this site, not the exception. A row saying "trials, but not for skin and hair" means registered studies exist and none of them asked this question. It is not a claim that the compound does nothing.