Peptides 101: what they are, what they can do
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Peptides are short amino-acid chains. In skincare and haircare they act as messengers or carriers. Some help improve the look of fine lines and firmness; oral collagen is a food supplement with mixed evidence. We only cover legal topical and oral products.
What a peptide is
Amino acids are the building blocks of proteins like collagen and elastin. A peptide is a short chain of those amino acids. In cosmetics, brands use specific sequences (copper tripeptide-1, palmitoyl pentapeptide-4, acetyl hexapeptide-8) designed to signal or carry.
Injectable versions are not covered here. We only cover topical and oral products sold legally as cosmetics or food supplements. Injectable or “research” peptides are not approved for personal use and carry real risks.
Where they show up
- Skincare serums and creams — copper peptides, Matrixyl, Argireline and multi-peptide blends. See skincare peptides.
- Hair and scalp serums — leave-on formulas that help hair look thicker. Evidence is early. See hair peptides.
- Oral collagen powders — food supplements. Independent reviews are mixed. See oral and collagen.
How we rate them
Every guide carries an evidence badge: strong, some, weak or mostly hype. We favour human trials over lab or animal data, and we say when a study is small or brand-funded. Our method.
Start with these
FAQ
Are peptides the same as proteins?
Peptides are short chains of amino acids; proteins are long ones. In cosmetics, “peptide” usually means a short, designed fragment.
Do I need a prescription?
No for the products we cover. Topical peptide serums are cosmetics; collagen powders are food supplements. Injectables are a different (and restricted) category and we do not cover them.
Will peptides replace retinol?
No. Retinol has much stronger evidence for the look of fine lines. Peptides are a gentler add-on.