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Now ask those who say D3 is bad for you to provide medical links for their reason, and then make up your own decision.
My own experience with D3: Before starting on D3 5 years ago, I suffered a TERRIBLE chest cold every year. And frequently twice a year. In the fall and aagin in the spring. These chest colds were so bad that they lasted for months, and I even lost my voice in some cases. Now since going on 10,000 IU Vitamin D3 daily, no more chest colds. If I feel a sniffle coming on, I boost D3 to 20,000 IU for a week, and sniffle is gone.
Wife is also on D3, and she hasn't had a cold in 5 years, either.
I have been researching health issues for years, and I can't think of a single doctor that has ever said not to takje D3. There is a lot of controversy on how much to take, so I follow the doctors above on this issue. 70 to 80 ng/ml blood reading is ideal.