Vitamin D3 plays an important role in maintaining strong bones and teeth. It promotes calcium absorption into the bones and helps maintain normal blood calcium levels. It also has a positive impact on the immune system, the cell renewal process and supports stronger muscles and extra muscle strength. Dietary supplements are food products intended to supplement the normal diet, consisting of concentrated sources of nutrients or other substances that have a nutritional or physiological effect, in single or combined form, and are marketed in a form that allows a specific dosage of each product and should be taken in small unit quantities.