Healthy Heart Pack BULGARIA 4LIFE Vitamin C contributes to the normal formation of collagen for the proper function of blood vessels. Vitamin B6, and vitamin B12 favor the normal formation of red blood cells. Vitamin C contributes to iron absorption. Vitamin A contributes to the normal metabolism of iron. Selenium, zinc and vitamin E help to protect cells against oxidative stress. Zinc contributes to fatty acids metabolism. Vitamin B6, B9 (folic acid), and vitamin B12 facilitate homocysteine metabolism. Copper, selenium, zinc, folic acid, and vitamins A, B6, B12, and C are beneficial to the normal function of the immune system.