Promote healthy tissues and blood cells with 21st Century Vitamin B-12. Promote healthy tissues and blood cells with 21st Century Vitamin B-12. This member of the B complex, also known as cyanocobalamin, promotes the grown and maintenance of tissue and is essential for red blood cell formation. No added salt, yeast, preservatives, artificial flavors or colors. Unconditionally guaranteed for purity, freshness and label potency.