![]() Light boxes filter out UV rays to deliver bright white light, and their mechanism of action is not thought to be related to ultraviolet light exposure (Lam et al, J Clin Psychiatry 2001). ![]() Production generally occurs with natural sun exposure (particularly in seasons and latitudes with high UV indexes) some might occur from tanning beds, although tanning beds emit primarily UV A ( Woo and Eide, 2010). Vitamin D3 is thought to be more potent than vitamin D2, with D3 and D2 being the two forms of vitamin D contained in supplements. Vitamin D3 (also called 1, 25-dihydroxycholecalciferol or calcitriol) is produced by the body when ultraviolet light (in the form of UV B) interacts with 7-dehydrocholesterol. Vitamin D refers to different forms of a steroid hormone. Sunlight is the main source of human vitamin D. Sources of vitamin D include sunlight (ultraviolet B, or UVB, rays), dietary intake, and supplements. ![]()
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