What are the ingredients in Niacin sourced from? Education Team October 13, 2021 00:26 Updated Follow Ingredient Source Niacin (nicotinic acid) Synthetic Related articles Other Ingredients and Their Purpose What is the purpose of each ingredient in Niacin? Does Niacin contain gluten or grains? Where are the ingredients in Phosphatidyl Serine from? What are the ingredients in Niacin Lozenge sourced from? Comments 0 comments Article is closed for comments.