Topical
Also known as: topical route · transdermal · applied to skin
Applied to the surface of the skin — the route studied for cosmetic peptides such as GHK-Cu, Argireline and Matrixyl.
Topical delivery means applying a compound to the skin’s surface, where it must penetrate the barrier to reach its target. It is the route of most interest for cosmetic-science peptides.
GHK-Cu, Argireline and Matrixyl are all studied topically for skin quality; some carry fatty-acid tails specifically to aid skin penetration. This is reference terminology only; products are supplied for research purposes only.
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RELATED TERMS
GHK-Cu
A copper-binding tripeptide (Gly-His-Lys) studied for collagen synthesis, skin remodelling and hair-follicle support.
Argireline
Acetyl hexapeptide-8 — the best-known cosmetic "neuro-cosmetic" peptide, studied for the appearance of expression lines.
Matrixyl
Palmitoyl pentapeptide — a topical peptide studied for stimulating collagen and extracellular-matrix synthesis in skin.
Bioavailability
The fraction of an administered dose that actually reaches circulation intact — low for oral peptides, higher for injection.
Research Use Only (RUO)
A designation that a compound is supplied strictly for laboratory research and is not intended for human or veterinary use.
Educational content, not medical advice. All products supplied for research purposes only — not for human consumption.