Beta-Sitosterol ●
TL;DR. This ingredient functions mainly as a skin-conditioning lipid and barrier-support agent, helping improve slip, cushion, and the feel of creams, balms, and oils.
What does Beta-Sitosterol do in a cosmetic formula?
This ingredient functions mainly as a skin-conditioning lipid and barrier-support agent, helping improve slip, cushion, and the feel of creams, balms, and oils.
Is Beta-Sitosterol clean?
From a clean-beauty perspective, it is generally well-tolerated, low in sensitization concern, and not a common restricted-list ingredient. Its main quality considerations are purity, residual processing solvents, and clear plant-source documentation.
Is Beta-Sitosterol sustainable?
It is typically obtained from vegetable oil refining streams or tall oil side streams, so feedstock traceability matters for soy, rapeseed, corn, or pine-derived sources. It is expected to biodegrade like other natural lipid-like materials and is not associated with high aquatic persistence.
Is Beta-Sitosterol COSMOS-approved?
It is generally permitted under COSMOS-natural and can be used in COSMOS-organic formulas when the raw material meets origin and processing criteria. It fits Green Chemistry principles best when sourced from renewable byproducts and processed with lower-impact solvents and controlled purification.
How does Beta-Sitosterol work chemically?
The molecule is a neutral, unsaponifiable lipid with a tetracyclic steroid nucleus, one secondary hydroxyl group, and one double bond, which makes it oil-dispersible and water-insoluble. It is commonly used at low levels in emulsions and anhydrous products, often around 0.1 to 2%, and is stable across typical cosmetic pH ranges but should be protected from prolonged heat and oxidation like other unsaturated lipids.
Last updated 2026-05-13