D Vita 1K capsule contains Cholecalciferol 1000 iu (International units). Cholecalciferol (Vitamin D3) 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. Thus Vitamin D3 in D Vita 1K capsule is essential for calcium absorption in the body. Other uses of D Vita 1K capsule are: Building and keeping the bones & teeth strongReducing Fatigue/stress and muscular painsBoosting immunity and increasing resistance against infectionSupplement for patients with diabetic complications and Cardiovascular Diseases as well. Use under medical supervision.