Garlic is an excellent source of minerals and vitamins that are essential for optimum health. The bulbs are one of the richest sources of potassium, iron, calcium, magnesium, manganese, zinc, and selenium. Selenium is a heart-healthy mineral and is an essential cofactor for antioxidant enzymes within the body. The human body uses manganese as a co-factor for the antioxidant enzyme, superoxide dismutase. Iron is essential for red blood cell formation.