Trucal suspension contains Calcium Vitamin D3(cholecalciferol)L-lysine and Magnesium which is used as nutritional supplement. Role of Key ingredients:Calcium ensures the adequate supply of calcium to bones. It may be used to treat conditions caused by low calcium levels such as breaking of bones.Cholecalciferol (Vitamin D3) which is a fat soluble vitamin that helps the body to absorb calcium and phosphorous found in food and supplements. Vitamin D is made by the body when skin is exposed to sunlight. Sunscreen protective clothing limited exposure to sunlight dark skin and age may prevent getting enough vitamin D from the sun thus leading to Vitamin D3 Deficiency.L-lysine is an essential amino acid for normal growth and development.It also helps in the absorption of calcium.Magnesium is necessary for bone mineralization and bone matrix formation. Trucal is a nutritional supplement which can be taken by people who have low levels of calcium in their blood. Use under medical supervision.