STEAROYL LEUCINE is graded A (Safe) by Expert·ING, based on COSING regulatory data.

STEAROYL LEUCINE

Safety grade: A

Stearoyl Leucine is a compound made by combining a fatty acid with an amino acid (a building block of proteins). It helps mix oil and water together in cosmetic formulas while also conditioning and softening hair and skin.

This ingredient works as an emulsifier to blend oil and water-based ingredients, while also providing conditioning and softening benefits to improve the feel and appearance of hair and skin.

Graded using: COSING.

Last verified: May 26, 2026