THIOLACTIC ACID is graded A (Safe) by Expert·ING, based on COSING regulatory data.
THIOLACTIC ACID
Safety grade: A
Thiolactic acid is a chemical compound that contains sulfur and is derived from lactic acid. It's used in beauty and personal care products for multiple purposes, including protecting products from spoilage and helping to relax or straighten hair.
This ingredient works as an antioxidant to prevent product degradation, a reducing agent to alter hair structure for straightening or waving, and a deodorant masking agent to neutralize unwanted odors.
Graded using: COSING.
Last verified: May 26, 2026
Other Antioxidant ingredients
- TOCOPHEROL — Grade A
- TOCOPHERYL ACETATE — Grade A
- BHT — Grade C**
- ASCORBYL PALMITATE — Grade A
- HYDROXYACETOPHENONE — Grade A
- PENTAERYTHRITYL TETRA-DI-T-BUTYL HYDROXYHYDROCINNAMATE — Grade A
- ASCORBIC ACID — Grade A
- CAMELLIA SINENSIS LEAF EXTRACT — Grade A