Question 1

What does Soy Sterols do in a cosmetic formula?

Accepted Answer

This ingredient is primarily a skin-conditioning lipid that supports barrier feel, emollience, and moisture retention in creams, balms, and treatment products. It can also help structure oil phases and improve cushion in richer formulas.

Question 2

Is Soy Sterols clean?

Accepted Answer

Clean-beauty standards generally treat this ingredient as low-friction: it is non-fragrant, low-sensitization, and not a common restricted-list item. Because it is highly refined, residual food-protein allergy concerns are typically minimal, though brands may document refining and GMO status.

Question 3

Is Soy Sterols sustainable?

Accepted Answer

It is commonly recovered from vegetable-oil refining side streams, so it can make use of material already generated in the edible-oil supply chain. It is biodegradable, but sourcing quality depends on crop practices, traceability, and non-GMO or certified supply if those claims matter.

Question 4

Is Soy Sterols COSMOS-approved?

Accepted Answer

It is generally compatible with COSMOS-natural and COSMOS-organic when produced from permitted plant feedstocks using allowed extraction and purification methods. Its fit with Green Chemistry is good because it can come from renewable oilseed streams, uses a lipid fraction rather than a persistent synthetic polymer, and has favorable biodegradation.

Question 5

How does Soy Sterols work chemically?

Accepted Answer

It is a mixture of cholesterol-like C27-C29 unsaponifiable lipids with a rigid four-ring hydrophobic core and one polar hydroxyl group, which lets it reinforce lamellar lipid structures in creams and balms. Typical use is around 0.1-2% in skin-care formulas; it is oil-dispersible rather than water-soluble, stable across normal cosmetic pH ranges, and best protected from prolonged heat and oxidation with appropriate antioxidants.