What is the non-food source of vitamin d?

There are two non-food sources of Vitamin D. (1) Vitamin D is created by your skin when it is exposed to ultraviolet UVB radiation present in sunlight. (2) According to the US National Institutes of Health, two forms of Vitamin D are commercially manufactured for use as dietary supplements. These are Vitamin D2 (ergocalciferol) and Vitamin D3 (cholecalciferol). These are included in vitamin supplements in liquid or pill form, and are added to certain foods (vitamin enriched foods). Vitamin D compounds are fat-soluble, which means they accumulate in the body's fatty tissues and remain there for a relatively long time; this also means that you need to be careful not to get too much Vitamin D, since the body has no quick way to get rid of it and it can easily build up to toxic levels if you take too many supplements. The American Academy of Dermatology advises that you should get your Vitamin D from foods or supplements rather than from UVB exposure, since UVB is known to be a primary cause of skin cancers.