Webber Naturals Calcium Vitamin-D3 650mg Tablets contains calcium and vitamin D3. Calcium is one of the most essential minerals in the human body, playing many roles in the maintenance of good health. Most importantly, calcium is known as a bone-strengthening mineral. It works synergistically with other nutrients, particularly vitamin D, to strengthen bones and teeth. Vitamin D3 facilitates calcium absorption and helps in the maintenance of healthy teeth and bones. Adequate calcium and vitamin D intake throughout life, along with a healthy diet and physical activity, may reduce the risk of developing osteoporosis. The chelated forms of calcium (i.e., carbonate, citrate, fumarate, malate, and succinate) enter the body's cells more efficiently, making it more readily absorbed and metabolized. Ultra calcium vitamin D3 from Webber Naturals is an easily absorbed supplement that not only helps in the development and maintenance of healthy bones and teeth, but also helps with immune function.