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Ingredient guide
macrocystis pyrifera peptide
In short
A peptide fraction from giant kelp that helps skin hold water and feel more supple. It forms a light, supportive film that can reinforce the skin’s surface barrier.
Reviewed against published evidence · editorially independent · no brand pays for placement
Works for
Barrier · Hydration
Best used
Anytime
What it is
Peptide fraction from Macrocystis pyrifera (giant kelp); INCI peptide form distinct from any giant kelp extract entries; alginic acid-adjacent peptide complexes support skin water-retention and barrier glycocalyx assembly; one of the fastest-growing organisms on Earth with high sustainable yield; emerging Pacific Coast premium marine ingredient in clean formulation.
Also found as
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Common questions
It supports surface hydration and helps the skin feel smoother and more comfortable. Its film‑forming action can give a cushioned, moisturised feel.
It suits most skin types, especially those looking for lightweight hydration and a softer feel. It’s generally well tolerated.
You’ll find it in serums, essences, and moisturisers designed to boost hydration. It works well alongside humectants and barrier‑supportive ingredients.
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Personal guidance only · For clinical concerns, see a dermatologist.