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Topical peptides for dermal and cosmetic research — GHK-Cu, Argireline, Matrixyl, and the melanocortin agonists Melanotan I and II.
Topical cosmetic peptides fall into three mechanistic groups.
Signal peptides stimulate fibroblast activity and extracellular-matrix synthesis. GHK-Cu, the copper-chelated form of glycyl-histidyl-lysine, activates wound-healing pathways and is incorporated into anti-aging formulations. Matrixyl (palmitoyl pentapeptide-4) is a fragment of type-I collagen that upregulates collagen production in cultured skin cells. AHK-Cu is the alanyl-histidyl-lysine copper complex marketed for hair-follicle research.
Neurotransmitter-inhibiting peptides mimic botulinum toxin's mechanism of action without its systemic risk. Argireline (acetyl hexapeptide-8) is the most widely formulated of the class; it inhibits SNARE-complex assembly to reduce acetylcholine release at the neuromuscular junction in treated skin. Snap-8 is a longer acetyl octapeptide with the same target. Syn-Ake (dipeptide diaminobutyroyl benzylamide diacetate) is a synthetic mimetic of the snake-venom component waglerin-1 and antagonizes the muscle nicotinic acetylcholine receptor.
Melanocortin agonists round out the category. Melanotan I (afamelanotide) is an α-MSH analog FDA-approved as Scenesse for erythropoietic protoporphyria; it stimulates eumelanin production. Melanotan II is a related but non-approved analog frequently associated with off-label tanning and libido effects.
None of the cosmetic signal peptides have FDA drug approval — their use is as ingredients in topical formulations at cosmetic (in-vitro level) concentrations. Research-peptide vendors stock each as a lyophilized powder.