What are the ingredients in NAC sourced from? Ceylon Keeslar September 23, 2022 19:14 Updated Follow Ingredient Source N-Acetyl-L-Cysteine Fermented Plant Substrate Related articles Does NAC contain corn, yeast, gluten or grains? What is the purpose of each ingredient in NAC? Magnesium Products Comparison Chart What are the ingredients in HistaminX sourced from? Comments 0 comments Article is closed for comments.