Sundown Naturals B12 provides you with a high potency source of this essential B Vitamin, which is also known as Cyanocobalamin. B12 supports heart and circulatory health, contributes to a healthy nervous system, and plays a role in energy metabolism. B12 also aids in the normal development and the regeneration of red blood cells. This vegetarian friendly formula allows you to reap all the benefits B12 is known for in an easy, one tablet a day dose.