THIMEROSAL is graded F** (Banned) by Expert·ING, based on COSING regulatory data. It is restricted under Health Canada (Prohibited).
THIMEROSAL
Safety grade: F**
This preservative is permitted in EU cosmetics with a maximum concentration limit and usage restrictions under EU Cosmetics Regulation (EC) No 1223/2009. To be sold legally in the EU or UK, a product must meet these conditions.
This preservative prevents the growth of microorganisms like bacteria and fungi, keeping cosmetic products fresh and safe to use throughout their shelf life.
Graded using: COSING.
- Health Canada — Prohibited
- Sephora Clean — Prohibited
- EU COSING — Restricted use
Last verified: June 9, 2026
Safer alternatives to THIMEROSAL
- POTASSIUM SORBATE — Grade B. Broad-spectrum preservative that prevents bacterial and fungal growth.
- PHENOXYETHANOL — Grade B**. Synthetic preservative that inhibits microbial growth in cosmetic products.
- SODIUM BENZOATE — Grade C. Antimicrobial preservative that extends product shelf life by preventing spoilage.
- CHLORPHENESIN — Grade B. Antimicrobial preservative effective against bacteria and fungi in formulations.
Other Preservative ingredients
- BENZYL ALCOHOL — Grade C**
- BENZOIC ACID — Grade C**
- METHYLISOTHIAZOLINONE — Grade C
- METHYLPARABEN — Grade C
- SALICYLIC ACID — Grade C**