The Food and Drug Administration has four answers about N-acetyl-L-cysteine use as a dietary ingredient in the US: two answers close the door on requests to deem it lawful and the other two are maybes about a rulemaking to make it lawful and about allowing sales to continue in the interim.
NAC Gains Tentative Safety Clearance As US Industry Contests FDA's Attempt To Remove It
FDA answers reach supplement industry sounding like a siren that the agency may take same enforcement step it has with NAC with other ingredients long used in supplements. Answers also might not be enough to convince firms to return NAC-containing supplements to their lineups.
