Researchers in Dublin, Ireland directed a study in which 98% of the members with obstructive sleep apnea were observed to be vitamin D deficient. Source: http://www.vitaminddeficiencysymptomsguide.com/

Vitamin D represents fat-solvent secosteroids group which is in charge of improving intestinal absorption of calcium, iron, magnesium, phosphate, and zinc. In this group, the most important vitamins for human beings are vitamin D3 (cholecalciferol) and vitamin D2 (ergocalciferol). Cholecalciferol and ergocalciferol can be provided by the diet or by the supplements. Only few food items contain Vitamin D. The major source of Vitamin D in humans is synthesis of Vitamin D in skin.

In the event that you disregard the sun, experience the ill effects of milk sensitivities, or stick to a strict veggie lover diet, you might be at danger for vitamin D insufficiency. Known as the sunshine vitamin, vitamin D is created by the body because of skin being presented to daylight. It is likewise happens actually in a couple of nourishments – including some fish, fish liver oils, and egg yolks – and in sustained dairy and grain items.

Vitamin D Sources