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

TRYPTOPHAN

Safety grade: A

Tryptophan is an amino acid, one of the building blocks that make up proteins. It's found naturally in foods like turkey, nuts, and seeds, and is also produced synthetically for use in cosmetics.

Tryptophan is used in hair care products to reduce frizz and static, improve hair conditioning and smoothness, and mask unpleasant odors in formulations.

Graded using: COSING, FDA.

Last verified: May 26, 2026