What are the ingredients in SAMe sourced from? Ceylon Keeslar November 02, 2021 19:23 Updated Follow Ingredient Source SAMe (S-adenosyl-L-methionine) Fermentation of Saccharomyces cerevisiae yeast Related articles Does SAMe contain GMOs? What is the purpose of each ingredient in SAMe? What are the ingredients in Optimal Vitamin C Powder sourced from? Are there any warnings or side effects when using Optimal Liposomal Glutathione? Does Optimal Prenatal contain gluten or grains? Comments 0 comments Article is closed for comments.