Vitamin D is an essential vitamin for calcium absorption and deposition into bones. The vitamin is also essential for healthy teeth and bones and important for a healthy immune system. Vitamin D is vital in maintaining blood levels of calcium- which it accomplishes by increasing absorption of calcium from food and reducing urinary calcium loss. Both effects keep calcium in the body and therefore spare the calcium that is stored in the bones. Sona D1000 contains a high potency of vitamin D with 25µg per tablet.