What are the active ingredients in Active B12 with L-5-MTHF lozenge derived from? Ceylon Keeslar October 19, 2020 13:40 Updated Follow Vitamin B12 as adenosylcobalamin is from fermentation. Vitamin B12 as methylcobalamin and folate are synthetic. Related articles Does Active B12 with L-5MTHF lozenge contain gluten, soy, or grains? Who is Active B12 with L-5MTHF lozenge intended for? What is Active Magnesium Chewable derived from? Is Active B12 with L-5MTHF lozenge free from GMOs? Other Ingredients and Their Purpose Comments 0 comments Article is closed for comments.