Vitamin D3 (cholecalciferol) is a fat-soluble vitamin synthesized in the skin. Although sunlight exposure results in some vitamin D production, recent research shows that not enough vitamin D is produced this way, especially with most people now staying out of the sun or applying sun-block which dramatically reduces vitamin D production. Vitamin D supplementation is important to maintain healthy blood levels of calcium by increasing calcium absorption & reducing urinary calcium loss.
Aids in calcium absorption
Maintaining healthy bones and teeth
Other indications include protecting against insomnia, multiple sclerosis, lupus, fibromyalgia and reduces insulin resistance