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Listen now to an extended interview with Dr. Joan Lappe, Professor of Nursing and Medicine and holder of the Criss-Beirne Endowed Chair in Nursing at Creighton University. She discusses the benefits and risks of vitamin D, the difference between vitamin D2 and vitamin D3 and how much vitamin D to take.

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Because I was always unusually tired, my endocrinologist thought I might benefit from a larger dose of Vit. D than the 500 units that I was taking daily in Centrum Silver. He gave me an rx for 50,00 units to be taken:
1 cap every week for 8 wks.
Then every 2 wks for 8 wks.
Then monthly. When I finished the month, I took no more BUT I was indeed less tired than before taking this rx. Hearing Dr. Joan Lappe, I feel I should now continue taking 50,00 units on a monthly basis and it will not hurt me. I probably could take more!
Thank you very much for this interview.