Question 1

What does Stearoyl Glutamic Acid do in a cosmetic formula?

Accepted Answer

This ingredient is primarily an anionic emulsifier and co-emulsifier, used to stabilize oil-in-water emulsions and improve the dispersion of oils, pigments, and lipophilic actives. It can also add a light conditioning feel without heavy residue.

Question 2

Is Stearoyl Glutamic Acid clean?

Accepted Answer

From a clean-beauty perspective, this ingredient is generally well tolerated, not a common allergen, and does not carry major restricted-list friction. Like many anionic materials, it may be less comfortable near the eyes or on very reactive skin at higher use levels.

Question 3

Is Stearoyl Glutamic Acid sustainable?

Accepted Answer

This material is commonly made from a fatty acid fraction paired with an amino acid, often using plant-derived or fermentation-derived inputs. It is expected to be readily biodegradable, with the main sourcing question being traceability of the fatty feedstock when palm-derived inputs are used.

Question 4

Is Stearoyl Glutamic Acid COSMOS-approved?

Accepted Answer

It is generally permitted under COSMOS-natural and COSMOS-organic when made from approved natural-origin feedstocks and compliant processing. Its profile fits Green Chemistry reasonably well because it can use renewable inputs, has good biodegradability, and performs at low levels in formulas.

Question 5

How does Stearoyl Glutamic Acid work chemically?

Accepted Answer

The molecule is a fatty acyl amino acid structure, combining a long saturated C18 lipid tail with a polar amino acid head group through an amide linkage. It is typically used at low levels, often around 0.1% to 1%, and performs best when the acidic groups are at least partly neutralized so the material can act more effectively at the oil-water interface.