Vitamin C promotes healthy capillaries, gums and teeth, and aids iron absorption. It helps heal wounds and broken bones and, by increasing the absorption of iron from the intestine, it helps treat anemia. Vitamin C plays a role in collagen formation within connective tissue and it contributes to hemoglobin and red-blood-cell production in bone marrow. Vitamin C is perhaps best known for its role as an immune system booster that helps prevent viral and bacterial infections. It is recommended for treatment of the common cold.