This product contains all the essential B vitamins at 100% of the RDA, and also includes several non-B vitamins. Choline serves as a co-enzyme in the metabolism of the B vitamins, which is why it is included. Inositol is closely involved with B6, folic acid, pantothenic acid and PABA and is associated with the metabolic pathways of these B vitamins. Vitamin C is included in the Multi B Extra because it prevents the oxidation of Vitamin B1, Vitamin B2 and Vitamin B5.Ingredients - One Tablet of Cytoplan Multi B Extra provides: Vitamin C 60mg Thiamin (B1) 1.4mg Riboflavin (B2) 1.6mg Niacin (B3) 18mg Vitamin B6 2mg Folacin 200µg Vitamin B12 1µg Biotin 0.15mg Pantothenic Acid 6mg Inositol 25mg Choline 25mg PABA 25mg