Stearic Acid ●
TL;DR. This ingredient is primarily a structuring agent and viscosity builder in creams, lotions, sticks, and cleansing bars. It also supports emulsions, adds opacity, and helps create a firmer, richer texture.
What does Stearic Acid do in a cosmetic formula?
This ingredient is primarily a structuring agent and viscosity builder in creams, lotions, sticks, and cleansing bars. It also supports emulsions, adds opacity, and helps create a firmer, richer texture.
Is Stearic Acid clean?
This ingredient is generally well-tolerated, not a common allergen, and has little clean-standard friction. In richer formulas it can feel heavy for some acne-prone users, but that is a formulation fit issue rather than a broad safety concern.
Is Stearic Acid sustainable?
This material is usually sourced from plant oils, often palm, soy, or rapeseed, and can also come from animal fats. It is readily biodegradable, with the main sustainability question being traceable sourcing, especially when palm-derived.
Is Stearic Acid COSMOS-approved?
It is permitted under COSMOS-natural and COSMOS-organic when made from allowed natural feedstocks and compliant processing. It fits Green Chemistry well when renewably sourced because it is biodegradable, chemically simple, and usually made through established fat-splitting and purification processes.
How does Stearic Acid work chemically?
The molecule is a saturated C18 fatty acid with a polar carboxyl head and a long hydrophobic chain, which explains its thickening, structuring, and emulsion-support behavior. Typical use is about 1 to 5% in creams and lotions, with higher levels in bars or sticks, and it is more oxidation-stable than unsaturated fatty acids.
Last updated 2026-05-13