Tetraselmis Suecica Extract
INCI: TETRASELMIS SUECICA EXTRACT
Reviewed by Daisy · Last updated 14 Aug 2026
A marine microalgae extract with antioxidant properties to help protect skin from environmental stress
Best For Skin Types
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Usage Frequency
Daily
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What Is Tetraselmis Suecica Extract?
Tetraselmis suecica is a green microalga—a single-celled marine organism—that contains high levels of carotenoids and other bioactive compounds. When extracted, these components are used in skincare for their antioxidant and skin-conditioning properties.
The extract functions primarily as an antioxidant and skin conditioner, working to neutralise free radicals and support the skin's natural repair mechanisms.
How It Works
The extract's carotenoids—particularly xanthophylls—are potent antioxidants that scavenge reactive oxygen species (ROS) and free radicals. When skin is exposed to UV radiation, cells produce excess ROS, which can damage collagen, trigger enzymes that break down skin structure, and accelerate visible signs of ageing. By neutralising these harmful molecules, Tetraselmis suecica extract helps reduce this damage.
Research also indicates the extract may activate genes and proteins involved in cellular repair and healing, supporting the skin's ability to recover from oxidative stress.
Clinical Evidence & References
Laboratory studies show Tetraselmis suecica extract has strong antioxidant activity and can reduce oxidative stress in human skin cells exposed to UVB radiation. The extract has demonstrated the ability to reduce free radical damage and suppress the activity of enzymes that degrade collagen in UV-irradiated fibroblasts.
Early evidence also suggests the extract can activate repair genes in skin cells and tissues. However, most evidence to date comes from cell and tissue studies rather than clinical trials on human skin, so more research is needed to confirm efficacy in real-world use.
How to Use
Tetraselmis suecica extract is typically used as part of a broader skincare formula rather than as a standalone ingredient. It works well in serums, moisturisers, and sun care products. As with any antioxidant, it pairs effectively with complementary protective ingredients like vitamin C or vitamin E, and should ideally be used as part of a consistent routine for best results.
Safety & Precautions
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