Fucus Serratus Extract
INCI: FUCUS SERRATUS EXTRACT
Reviewed by Kate · Last updated 14 Aug 2026
A brown seaweed extract that supports skin elasticity and antioxidant defence
Best For Skin Types
All, Mature
Addresses
Effective Concentrations
1%
Usage Frequency
Daily
What Is Fucus Serratus Extract?
Fucus serratus extract is derived from a species of brown seaweed found in coastal waters. Like other brown algae, it contains naturally occurring polyphenols and bioactive compounds that have been investigated for their effects on skin health and resilience.
In skincare formulations, this ingredient functions primarily as a skin protectant, working to support the skin's natural defences against environmental stressors and signs of ageing.
How It Works
Fucus serratus extract appears to work through multiple mechanisms. Its polyphenol compounds act as antioxidants, neutralising free radicals that contribute to premature ageing and skin damage. The extract has also been shown in laboratory studies to stimulate heme oxygenase-1, an enzyme involved in reducing inflammation and protecting cells from oxidative stress.
Additionally, research suggests the extract may promote the activity of fibroblasts—the cells responsible for producing and maintaining collagen—potentially helping to preserve skin thickness and mechanical strength, properties that naturally decline with age.
Clinical Evidence & References
A small clinical study found that a 1% formulation applied twice daily for five weeks resulted in measurable improvements in skin elasticity and a reduction in skin thickness on cheek skin, measured using ultrasound and mechanical testing. The researchers noted that these changes are typically opposite to age-related patterns, suggesting the extract may have anti-ageing properties.
In vitro research has demonstrated antioxidant and anti-inflammatory activity, and some evidence suggests benefit for under-eye dark circles through multiple pathways including antioxidant and collagen-supporting mechanisms. However, more clinical studies in human volunteers are needed to fully establish efficacy at typical cosmetic use concentrations and to confirm benefits across different skin types and concerns.
How to Use
Fucus serratus extract is typically used as a supporting ingredient within formulations rather than as a standalone product. It works well in serums, moisturisers and targeted treatments applied to the face and neck. Use as directed on the product label; most formulations recommend daily application as part of your routine.
Safety & Precautions
Frequently Asked Questions
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