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

PROLINE

Safety grade: A

Proline is an amino acid, which are the building blocks of proteins found naturally in your body and skin. It helps maintain skin firmness and supports healthy hair structure.

Proline is used in cosmetics to condition and moisturize both skin and hair by helping to maintain their natural protein structure and improve hydration and elasticity.

Graded using: COSING, FDA.

Last verified: May 26, 2026