Vitamin D is essential for promoting calcium absorption in the gut and maintaining adequate serum calcium and phosphate concentrations to enable normal mineralization of bone and prevent hypocalcemic tetany. It is also needed for bone growth and bone remodeling by osteoblasts and osteoclasts. Without sufficient vitamin D, bones can become thin, brittle, or misshapen. Vitamin D has other roles in human health, including modulation of neuromuscular, immune function and reduction of inflammation. Evidence has been offered that they are metabolized differently. Vitamin D3 could be more than three times as effective as vitamin D2 in raising serum 25(OH)D concentrations and maintaining those levels for a longer time, and its metabolites have superior affinity for vitamin D binding proteins in plasma. Very few foods in nature contain vitamin D. Obtaining sufficient vitamin D from natural food sources alone can be difficult. For many people, consuming vitamin D fortified foods and being exposed to sunlight are essential for maintaining a healthy vitamin D status. In some groups, dietary supplements might be required to meet the daily need for vitamin D.Chew D Max 1000 is available in a delicious tasting natural berry flavor. Also perfect for those who have difficulty swallowing or simply prefer a chewable supplement, it contains no artificial flavors, preservatives, or food coloring.