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Calcium and Vitamin D. Calcium and vitamin D are two of the most important nutrients for bone and muscle health. Calcium can be found in dairy products, leafy green vegetables, almonds and calcium-fortified foods and juices.Vitamin D helps the body absorb calcium, so many fortified products with calcium also have added vitamin D. This vitamin also boosts muscle strength and helps prevent muscle weakness.alcium can be found in dairy products, leafy green vegetables, almonds and calcium-fortified foods and juices. Vitamin D helps the body absorb calcium, so many fortified products with calcium also have added vitamin D. This vitamin also boosts muscle strength and helps prevent muscle weakness.
An adequate calcium intake and adequate amounts of vitamin D are important foundations for maintaining bone density and strength. However, vitamin D and calcium alone are not sufficient treatment for osteoporosis and are given in conjunction with other treatments.Vitamin D is important in several respects:1  Vitamin D helps the absorption of calcium from the intestines. 2  A lack of vitamin D causes calcium-depleted bone (osteomalacia), which further weakens the bones and increases the risk of fractures.. An adequate calcium intake and adequate amounts of vitamin D are important foundations for maintaining bone density and strength. However, vitamin D and calcium alone are not sufficient treatment for osteoporosis and are given in conjunction with other treatments. Vitamin D is important in several respects: