Vitamin D is an Essential Vitamin or Mineral known as the sunlight vitamin, since it is synthesized in the skin when exposed to the sun's radiation. It provides benefits for bone structure support...

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Vitamin D is a fat-soluble nutrient. It is one of the 24 micronutrients critical for human survival. The sun is the major natural source of the nutrient, but vitamin D is also found naturally in fish and eggs. It is also added to dairy products. Supplemental vitamin D is associated with a wide range of benefits, including increased Cognition, immune health, bone health and well-being. Supplementation can also reduce the risks of cancer, heart disease, diabetes and multiple sclerosis. People deficient in vitamin D may also experience increased Testosterone levels after supplementation. The body produces vitamin D from cholesterol, provided there is an adequate amount of UV light from sun exposure. There is only a sufficient amount of UV light coming from the sun when the UV index is 3 or higher, which only occurs year-round near the equator, between the 37th parallels. Most people are not deficient in vitamin D, but they do not have an optimal level of vitamin D either. Due to the many health benefits of vitamin D, supplementation is encouraged if optimal levels are not present in the body.

additional information

"Vitamin D3 is a source of preformed vitamin D. Vitamin D is a group of fat-soluble secosteroids responsible for enhancing intestinal absorption of calcium, iron, magnesium, phosphate and zinc. In humans, the most important compounds in this group are vitamin D3 (also known as cholecalciferol) and vitamin D2 (ergocalciferol). Vitamin Deficiency
Low free sex hormones. Vitamin D deficiency is associated with many conditions, including bone loss, kidney disease, lung disorders, diabetes, stomach and intestine problems, and heart disease. Vitamin D supplementation has been found to help prevent or treat vitamin D deficiency. Low levels of vitamin D have been linked to compromised immunity, mood disorders, anxiety, depression, cognitive performance issues, seasonal affective disorder, Parkinson's disease, Alzheimer's disease, cardiac disease, hypertension, multiple sclerosis, type 1 diabetes, and various cancers. The body produces vitamin D from cholesterol, provided there is an adequate amount of UV light from sun exposure. There is only a sufficient amount of UV light coming from the sun when the UV index is 3 or higher, which only occurs year-round near the equator, between the 37th parallels. Most people are not deficient in vitamin D, but they do not have an optimal level of vitamin D either. Due to the many health benefits of vitamin D, supplementation is encouraged if optimal levels are not present in the body."

LINK - http://examine.com/supplements/Vitamin+D/