-D3, or cholecalciferol, in Doctor's Best Vegan D3 helps regulate phosphorus, calcium, and promotes bone, teeth, and heart health. Vitamin D3 is naturally produced in the skin through UV rays and can be obtained from limited food sources. Sun protection and climate can affect Vitamin D3 levels. This nutrient supports immune function, cardiovascular health and bone strength, and influences chemical messengers in the immune system.
