Now B-100 Vitamin B-Complex Capsules contains all of the B vitamins, as well as Choline and Inositol. B complex vitamins include thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), pyridoxine (vitamin B6), biotin, folic acid, and cobalamins (vitamin B12). These vitamins help to produce energy, regulate homocysteine metabolism, and improve nervous system health. B-vitamins are water soluble and, with the exception of B-12, have limited store capacity in the body, necessitating daily replenishment. The B vitamins play an interconnected role in keeping our brains functioning properly. Adequate levels of B vitamins in the body are required for proper physiological and neurological function. According to research, B vitamins can improve mood and lessen physiological responses to stress. While B-12 is stored in the liver, dietary supplies are limited to animal products (meat and dairy), so B-12 supplementation may be especially useful for vegetarians.