B Complex provides a full complement of B-vitamins plus choline and inositol--two molecules that regulate homocysteine for a healthy heart and produce the important neurotransmitter acetylcholine involved in memory and learning. B-Vitamins are water soluble, and with the exception of B-12, have limited storage in the body and thus require daily replenishment. While B-12 is stored in the liver, dietary sources are of animal origin only (meat and dairy), so supplementation with B-12 is especially important for vegetarians and vegans.