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

THEANINE

L-Theanine

Safety grade: A

L-Theanine is an amino acid naturally found in tea leaves that helps skin retain moisture and stay soft. It's known for its calming properties and is often used to soothe and relax the skin.

This ingredient is used in cosmetics to hydrate the skin, improve its texture, and provide a soothing effect that leaves skin feeling smooth and conditioned.

Graded using: COSING, FDA.

Last verified: May 26, 2026