Doctors Best - Vitamin D3 (1000IU) 180 softgelsProduct Description Vitamin D is a nutrient that is critical to many bodily functions. It is beneficial for supporting bone health, immune wellness, cardiovascular function and cellular metabolism. Vitamin D is essential for life; it regulates calcium homeostasis in the body, plays a role in most organs and systems of the body and acts as a molecular switch by influencing the expression of multiple genes. Studies have shown that Vitamin D levels are