E920 refers to L-Cysteine Hydrochloride, a form of Cysteine, which is an amino acid from hair that can come from animals or humans or be synthesized from coal tar. L-Cysteine Hydrochloride is used to treat adverse reactions to acetaminophen. Please check with the manufacturer to find out the source of E920. When you see an “E-number” like E920, it refers to an ingredient that has been approved by the European Union for use as a food additive.
