TETRAPEPTIDE-99 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-99

Safety grade: A

A small protein fragment designed to help reduce the appearance of fine lines and wrinkles by supporting skin's natural firmness and elasticity. This ingredient works to strengthen the skin's structure, making it useful in anti-aging creams and serums for a smoother, more youthful-looking complexion.

Graded using: COSING.

Last verified: June 9, 2026