What are the ingredients in NAC sourced from? Ceylon Keeslar October 12, 2021 23:23 Updated Follow Ingredient Source N-Acetyl-L-Cysteine Synthetic Related articles Is NAC free from GMOs? What is the purpose of each ingredient in NAC? Are there any warnings or side effects when using NAC? Product Updates Who is NAC intended for? Comments 0 comments Article is closed for comments.