Pin to Board Add to Existing Board You are not currently logged in. Log in or create an account to save and view pinboards. Create New Board Office of Dietary Supplements – Vitamin B12 Vitamin B12 overview for health professionals. Research health effects, dosing, sources, deficiency symptoms, side effects, and interactions here. Source: Office of Dietary Supplements – Vitamin B12 Write for NutriScape! Cancel replyYou must be logged in to post a comment.