Macrocystis pyrifera extract, derived from giant brown algae, is a marine‑sourced asset extensively valued in skincare formulations. Rich in vitamins (A, B complex, and notably potent vitamin E), essential fatty acids (oleic and linoleic acids), minerals, and silica, it delivers antioxidant protection, supports barrier repair, and fortifies the skin’s hydration by reducing transepidermal water loss (TEWL). Clinical research, including both preclinical and human studies, confirms its capacity to increase collagen type I production, enhance stratum corneum barrier integrity, reduce skin redness, and augment moisture retention — especially in post‑procedure or inflammation‑induced barrier disruption contexts.
In haircare, Macrocystis pyrifera extract offers a nourishing and soothing profile, supplying trace minerals, iodine, amino acids, and antioxidants that support scalp health, regulate sebum, energize follicles, and promote shine and manageability. Its composition helps reinforce the scalp’s protective layer and mitigate oxidative stress — benefits leveraged in conditioners, shampoos, masks, and root‑treatment formulas.

Quick Insights
Ingredient Rating:
GREAT
Type of Ingredient:
Hydrator, Texture Enhancer, Conditioner, Antioxidant, Soother, Anti-Inflammatory Agent and Barrier Support
Intended Function:
To improve skin barrier strength, retain moisture, soothe inflammation, supply antioxidant defense, and enhance skin and scalp conditioning.
Common Applications:
Employed in creams, serums, masks, lotions, shampoos, conditioners, and post‑procedure recovery treatments to deliver hydration, barrier repair, anti‑aging, and soothing effects.
Target Audience:
Cosmetic brand owners and formulators seeking marine‑derived, scientifically validated actives to craft premium skincare and haircare lines, particularly those focusing on barrier restoration, anti‑aging, and recovery from aesthetic procedures.
Also Known As:
Sea Kelp Extract, Giant Kelp Extract, Macrocystis Pyrifera Extract, Extract of Macrocystis Pyrifera.
Safety Analysis
Regulatory Verdict: The independent Cosmetic Ingredient Review (CIR) panel deems Macrocystis pyrifera extract safe within typical usage levels (around 0.1–1%), commonly found in cosmetic formulations.
Contamination Concerns: While EWG notes potential contamination risk due to environmental sourcing, hazard ratings for cancer, allergies, and developmental toxicity remain low, with data limitations — highlighting the importance of sourcing from clean, tested suppliers.

References
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