Now B-100 Vitamin B-Complex Capsules For Energy Production & Nervous System provides a full complement of B-Vitamins plus Choline and Inositol. The vitamins that make up B complex are thiamine (vitamin B1), riboflavin (vitamin B2), niacin (vitamin B3), pantothenic acid (vitamin B5), pyridoxine (vitamin B6), biotin, folic acid, and the cobalamins (vitamin B12). These vitamins work to support energy production, maintain healthy homocysteine metabolism, and promote the health of the nervous system. B-Vitamins are water soluble, and with the exception of B-12, have limited storage in the body and thus require daily replenishment. The B vitamins play an inter-related role in keeping our brains running properly. Adequate amounts of B vitamins in the body are essential for optimal physiological and neurological functioning. Research shows that the B vitamins can significantly benefit mood and reduce the physiological response to stress. While B-12 is stored in the liver, dietary sources are of animal origin only (meat and dairy) and supplementation with B-12 may be especially important for vegetarians.