SH-POLYPEPTIDE-91 is graded A (Safe) by Expert·ING, based on COSING regulatory data.

SH-POLYPEPTIDE-91

Safety grade: A

This ingredient is a protein-based compound that helps strengthen and condition hair and skin. It works by coating and protecting the outer layer, helping to improve texture and reduce frizz or dryness. It's commonly used in shampoos, conditioners, and skincare products to enhance smoothness and resilience.

Graded using: COSING.

Last verified: June 9, 2026