Sundown Naturals Vitamin B-12 High Potency 1000 mcg, 60 Tablets 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.