CASTOR ISOSTEARATE ●
TL;DR. This ingredient is primarily an emollient and pigment-wetting agent, adding slip, cushion, gloss, and improved dispersion in lip, color, and skin-care formulas.
What does CASTOR ISOSTEARATE do in a cosmetic formula?
This ingredient is primarily an emollient and pigment-wetting agent, adding slip, cushion, gloss, and improved dispersion in lip, color, and skin-care formulas.
Is CASTOR ISOSTEARATE clean?
From a clean-beauty perspective, it is generally well tolerated and not a common restricted-list concern. Sensitivity is uncommon, though richer ester materials can feel heavy on very congestion-prone skin depending on the full formula.
Is CASTOR ISOSTEARATE sustainable?
It is typically made from plant-derived fatty materials and a branched C18 fatty acid, so sourcing quality depends on the agricultural feedstock and supplier traceability. It is expected to be biodegradable and has low volatility, with limited environmental persistence concerns compared with silicone or fluorinated film-formers.
Is CASTOR ISOSTEARATE COSMOS-approved?
It can be permitted under COSMOS-natural when made from approved natural feedstocks through allowed esterification chemistry, but certification depends on the exact manufacturing route and documentation. Its Green Chemistry profile is favorable when renewable inputs are used, with good biodegradability and no need for highly persistent chemistry.
How does CASTOR ISOSTEARATE work chemically?
The molecule is a bulky lipophilic ester built from long fatty chains, which explains its cushiony skin feel, pigment-wetting behavior, and strong oil-phase compatibility. It is typically used around 1 to 20% in emulsions, balms, and color cosmetics, and it is stable in anhydrous systems and across normal cosmetic pH ranges when the overall formula is properly protected from oxidation.
Last updated 2026-05-13