Vitamin D3 helps the human body to absorb calcium. Calcium is for strong bones. It is the natural form of the vitamin the human body forms and is taken when the body has a deficiency that prevents it from maintaining its calcium levels and encourages normal bone growth. When you are choosing your Vitamin D3 supplement to be sure of its purity and potency. You don’t have to look any further, our Vitamin D3 supplements have met the strictest standards and are prepared and blended in an FDA registered facility and adhere to Good Manufacturing Practice (GMP) methods.