Vitamin D3 Tablets are available in easy-to-swallow tablets. This vitamin is a vital nutrient that is needed for proper absorption of calcium and phosphorus. Vitamin D3 helps with the formation of strong bones, teeth, and skin. Vitamin D3 is available in both a liquid and tablet form. Vitamin D3 tablets provide your body with a vitamin D3 source. Vitamin D is important for the health of your bones, immune system, muscles, and skin. It helps regulate blood calcium levels, and the production of hormones like testosterone and estrogen. Vitamin D is also essential for brain development and functioning. Vitamin D3 tablets come in tablet form and are taken orally.