Vitamin B-12 Is Necessary For The Production Of Energy From Fats And Proteins And Is Well Known For Its Critical Role In Dna Synthesis As Well As In Homocysteine Metabolism.* Methylcobalamin Is The Co-Enzyme Form Of Vitamin B-12 That Has Been Found To Be Especially Critical In The Maintenance Of A Healthy Nervous System.* Dietary Sources Are Almost Exclusively Of Animal Origin (Meat And Dairy) And Supplementation With B-12 May Be Especially Important For Strict Vegetarians. Now® Methyl B-12 Is Vegetarian/Vegan (Non-Animal Derived).