A subfragment of type I procollagen. The biology is neat: when collagen is damaged, its breakdown fragments act as signals — matrikines — telling fibroblasts to synthesise more. Pal-KTTKS presents that damage signal without any actual damage. The palmitoyl chain is the engineering that matters: it makes the hydrophilic pentapeptide lipophilic enough to traverse the stratum corneum, which is precisely the problem argireline has not solved.
Among the better-supported cosmetic peptides. Controlled studies, including some independent of manufacturers, report reductions in wrinkle depth and improvement in skin roughness over 12 weeks. Effects are modest and slow — consistent with a genuine collagen-synthesis mechanism rather than a cosmetic optical trick.
A cosmetic ingredient; no FDA pre-approval required. Appearance claims only.
Excellent topical safety record. Low irritancy relative to retinoids, which is much of its commercial appeal.
Forge Bioenergy does not publish dosing, reconstitution, or administration protocols for any peptide. See our editorial policy for why. If you are considering any substance on this page, that conversation belongs with a licensed physician.
Regulatory status changes. This page reflects our reading of public sources as of July 2026 and should be independently verified before it is relied upon.