Vitamin D recommendations have undergone many revisions, with most recent research studies suggesting optimal levels to be much higher than previously proposed. Living in Northern versus tropical climates, having fair versus dark skin, using cholesterol-lowering medications, being able to efficiently synthesize Vitamin D from cholesterol in the skin through UVB exposure, and supplementing optimal amounts of Vitamin D3 per day, are all factors that ultimately determine the successful prevention of a host of medical conditions, ranging from osteoporosis to several types of cancer. However some researchers suggest that lower Vitamin D levels are not the cause, but rather the result of these diseases... Full Text