Description MapleLife® Calcium + Vitamin D contains optimal amounts of both calcium and vitamin D to maintain normal calcium and phosphorus levels in the blood, maintain a healthy immune system, and regulate cell growth and differentiation. Vitamin D is a fat-soluble vitamin that aids in the absorption of calcium. It exists in several forms, each with a different level of activity. Cholecalciferol, the source used in this product is the most active form of vitamin D, other forms are relatively inactive in the body. A vitamin D deficiency can lead to thin, brittle bones, and a severe deficiency can cause rickets, a debilitating skeletal disease. Calcium is the most abundant mineral in the body. It is essential for the development and maintenance of strong bones and teeth, as well as to prevent fractures due to osteoporosis.