POTASSIUM HYDROGEN SULFITE is graded B (Low Concern) by Expert·ING, based on EU COSING Annex V regulatory data. It is restricted under EU COSING (Restricted use).

POTASSIUM HYDROGEN SULFITE

Inorganic sulphites and hydrogensulphites (5)

Safety grade: B

This preservative is permitted in EU cosmetics up to a maximum concentration under EU Cosmetics Regulation (EC) No 1223/2009. To be sold legally in the EU or UK, a product must stay within this limit.

Graded using: EU COSING Annex V.

• EU COSING — Restricted use

Last verified: June 9, 2026