Algae Extract
INCI: Algae
Reviewed by Kate · Last updated 5 Aug 2026
Also known as: Algae, Hydrolyzed Algae Extract, Seaweed Extract, Marine Algae
Comes from algae, very simple, chlorophyll-containing organisms Help thicken formulas
Best For Skin Types
All skin types
Usage Frequency
As directed on product packaging
EWG Safety Score
What Is Algae Extract?
Algae extract comes from algae, which are very simple, chlorophyll-containing organisms in a family that includes more than 20,000 different known species. In cosmetics, algae act as thickening agents, water-binding agents, and antioxidants.
Some algae are also potential skin sensitizers. For example, the phycocyanin present in blue-green algae has been suspected of sensitization on the basis of patch tests.
Other forms of algae, such as Irish moss and carrageenan, contain proteins, vitamin A, sugar, starch, vitamin B1, iron, sodium, phosphorus, magnesium, copper, and calcium. Most of these are beneficial for skin, as emollients, soothing agents, or antioxidants.
New research shows forms of brown algae show promise for improving the appearance of ageing skin. As a plant ingredient, all types of algae are prone to breaking down with routine exposure to air and light. Because of this, avoid anti-ageing products with algae that are packaged in jars.
Algae are a diverse group of aquatic organisms capable of conducting photosynthesis. In skincare, certain algae extracts function as emollients and soothing agents, delivering a variety of nutrients to the skin including vitamins, minerals, and amino acids.
Clinical Evidence & References
Published Research
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Algae extract: Rich source of polysaccharides for skin Mar Drugs, 2015
Frequently Asked Questions
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