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Odds Are You Need Additional Vitamin D, and Cod Liver Oil is Not Sufficient

According to the world?s foremost medical expert on calcium and vitamin D, Professor Heaney (also see bio below), of all the nutrients associated with chronic disease, none have the potential payoff of vitamin D. Dr. Heaney says that 25-hydroxyvitamin D (calcidiol) levels below 32 ng/ml constitute vitamin D deficiency. In 2003 he discovered that normal humans utilize about 10 times the RDA of 400 IU a day. So we need about 4,000 IU, not 400, of vitamin D a day, which suggests that vitamin D...