CALCIUM SULFIDE is graded C (Moderate) by Expert·ING, based on COSING, FDA regulatory data. It is restricted under EU COSING — AnnexIII-SAFETY-.
CALCIUM SULFIDE
Safety grade: C
Calcium sulfide is a chemical compound that works by breaking down the protein structure of hair, allowing it to be easily wiped or washed away from the skin. It's the active ingredient in many traditional hair removal products.
This ingredient is used in depilatory products to chemically dissolve hair at the skin's surface, providing a quick and painless method of temporary hair removal.
Graded using: COSING, FDA.
- EU COSING — Restricted
- Health Canada — Restricted
Last verified: May 26, 2026
Safer alternatives to CALCIUM SULFIDE
- AMMONIUM THIOLACTATE — Grade A. Chemically dissolves hair via reducing agents, similar depilatory mechanism.
- MERCAPTOPROPIONIC ACID — Grade A. Reducing agent that breaks hair disulfide bonds for chemical hair removal.
Other Depilatory ingredients
- THIOGLYCERIN — Grade A
- POTASSIUM THIOGLYCOLATE — Grade C**
- COPERNICIA CERIFERA WAX — Grade A
- THIOLACTIC ACID — Grade A
- CALCIUM THIOGLYCOLATE — Grade C**
- THIOGLYCOLIC ACID — Grade D**
- COLOPHONIUM — Grade A