TETRAPEPTIDE-136 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

TETRAPEPTIDE-136

Safety grade: A

A lab-created protein fragment that works to strengthen and support your skin's structure. It helps improve skin firmness and elasticity by boosting the skin's natural support system. You'll typically find it in anti-aging serums and moisturizers designed to reduce fine lines and keep skin looking lifted.

Graded using: COSING.

Last verified: June 9, 2026