There is an increasing awareness how a large percentage of the population is vitamin D deficient and the ill health effects caused by inadequate Vitamin D levels. If someones blood work comes back as below 30ng/ml I usually dose them with at least 10,000IU/day for 3 weeks then cut down to 5000IU/day for a couple of weeks then wait a week of no supplementation and retest. I usually hear comments about vitamin D toxicity, but as BU researcher Michael Holick has stated – “doctors have never seen a vitamin D toxicity – it is all theory”. Read the rest of this entry