Ingredient guide
Giant Kelp Peptide
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 to be featured
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.
What the evidence says
LimitedPeptidesapplied to skin
Early, encouraging evidence in relation to smoother-looking skin. A genuinely active research area.
Studied as palmitoyl-KTTKS.
Much of the evidence is small, split-face and manufacturer-sponsored.
See 2 sources
Palmitoyl-KTTKS is dermally stable and skin-permeable; relates to the type-I collagen precursor sequence.
skin permeation, dermal stability · palmitoyl-KTTKS
Int J Cosmet Sci, 2014Split-face trials report wrinkle/roughness improvement; evidence base modest and mostly manufacturer-led.
wrinkles, roughness
Cosmetics, 2017
Also found as
Related
Where to find it
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Search the Lens for giant kelp peptideCommon questions
What does Giant Kelp Peptide do for skin?
It supports surface hydration and helps the skin feel smoother and more comfortable. Its film‑forming action can give a cushioned, moisturised feel.
Who is Giant Kelp Peptide suitable for?
It suits most skin types, especially those looking for lightweight hydration and a softer feel. It’s generally well tolerated.
How is Giant Kelp Peptide used in skincare?
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, not medical advice.