shelcal 500 Calcium Tablets for Stronger Bones and Muscles, shelcal tablets are among the best calcium and vitamin D3 tablets, as they work to effectively enhance calcium absorption in the body due to their vitamin D content, which helps repair bones. Taking two shelcal tablets is equivalent to 4 cups of milk daily, as it is composed of calcium from an organic source, which contributes to improving bone density, strengthening muscles, and teeth for adult men and women, and improving muscles and bones as you get older.