Ergosterol
INCI: ERGOSTEROL
Reviewed by Daisy · Last updated 14 Aug 2026
A plant sterol with antioxidant and skin-conditioning properties
Best For Skin Types
All, Dry, Sensitive
Addresses
Usage Frequency
Daily
What Is Ergosterol?
Ergosterol is a sterol (a type of lipid) found naturally in fungi, algae, and marine organisms. It is structurally similar to cholesterol and plays an important role in cell membrane stability. In skincare formulations, ergosterol functions as a skin conditioning agent, helping to maintain the skin's barrier and support its natural lipid profile.
The ingredient is also notable as a precursor to ergocalciferol (vitamin D2), which is synthesised when ergosterol is exposed to UV light. This metabolic pathway is relevant to understanding how certain sterols interact with skin physiology.
How It Works
Ergosterol works through several mechanisms. As a structural sterol, it integrates into cell membranes and liposomal delivery systems, increasing their stability and packing density whilst maintaining appropriate flexibility. This helps support the skin barrier's function in retaining moisture.
When exposed to UV radiation, research suggests ergosterol activates cellular defence pathways that reduce oxidative stress and suppress pro-inflammatory signalling cascades (specifically NF-κB and MAPK pathways). This may help protect skin cells from some of the damage associated with sun exposure.
Clinical Evidence & References
In vitro and animal studies indicate that ergosterol possesses antioxidant and anti-inflammatory properties. Research in UV-irradiated skin cells showed that ergosterol treatment preserved cell viability, reduced reactive oxygen species, and suppressed inflammatory mediators. Topical application in mouse models demonstrated significant attenuation of UVB-induced skin damage.
However, human clinical trial data on ergosterol in skincare formulations remains limited. The evidence is promising but largely derived from laboratory and animal models. Further human studies would help establish its efficacy in real-world skincare use.
Published Research
How to Use
Ergosterol is typically incorporated into serums, moisturisers, and barrier-support products. It works well alongside other barrier-supporting ingredients such as ceramides and fatty acids. As a conditioning sterol, it is generally well-tolerated at cosmetic concentrations and can be used daily as part of a regular skincare routine.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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Equisetum Arvense Juice
A plant-derived conditioning agent traditionally used to support skin resilience
Equisetum Hyemale Extract
A plant extract traditionally valued for supporting skin soothing and resilience
Ergocalciferol
A vitamin D form that conditions skin and may support its natural resilience to UV damage
Erigeron Annuus Flower Oil
A plant oil that conditions and softens the skin barrier
Eruca Sativa Leaf Extract
A plant extract with conditioning properties to support skin hydration and comfort
Erucic Acid
A long-chain fatty acid that helps condition and support skin barrier function
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