The fight between the dietary supplement industry and FDA over the ingredient NAC will heat up in 2022: 2022 Ingredient trends for food, drinks, dietary supplements, and natural products Nutritional Outlook Effect of N Acetylcysteine in Mitochondrial Function, Redox Signaling, and Sirtuin 3 Levels in the Heart During Cardiorenal Syndrome Type 4 Development N acetylcysteine (NAC) is a supplement I frequently recommend to clients most commonly for conditions such as endometriosis or as part of post concussion protocols. Some of you might also recognise NAC L Carnitine vs Acetyl L Carnitine: Which is Better