Peptides for Skin: What Actually Reaches the Dermis
Most cosmetic peptide claims fail at the stratum corneum. A few classes have real supporting mechanism.
The skin barrier exists to keep molecules out. Peptide size, charge and formulation determine whether anything meaningful crosses it.
Signal peptides
These fragments mimic collagen breakdown products and prompt fibroblasts to synthesize more matrix. They are the best-supported cosmetic class.
Carrier and neurotransmitter-inhibiting peptides
Carriers deliver trace minerals used in wound repair; others reduce muscle-driven expression lines topically, with modest effect sizes.
Systemic support
Where topical delivery is the limitation, provider-directed systemic protocols can work from the inside — evaluated case by case.
Frequently asked
This article is educational and is not medical advice. Treatment decisions are made by a licensed provider after a clinical evaluation.
