Liquid B-12 B-Complex 8 fl. oz. by NOW is a dietary supplement that provides the important B-vitamin necessary for optimum health of the nervous system as well as proper energy production in the body. Vitamin B-12 is also essential for the DNA synthesis which helps develop healthy blood cells. Liquid B-12 B-Complex 8 fl. oz. also contains Vitamin B-6 and folic acid. which promote proper homocysteine levels that help maintain a healthy cardiovascular system.