What are the ingredients in Hydroxo B12 sourced from? Ceylon Keeslar October 07, 2021 19:15 Updated Follow Ingredient Source Vitamin B12 (as hydroxocobalamin) Synthetic Related articles What are the ingredients in Hydrox-Adeno B12 sourced from? Is Hydroxo B12 free from GMOs? What are the ingredients in Adeno B12 sourced from? What is the purpose of each ingredient in Hydroxo B12? Who is Hydroxo B12 intended for? Comments 0 comments Article is closed for comments.