There may be some problems with getting D3 from the sun. 1) as we age we become less able convert sunlight to D3. 2) in cold weather it won't work through glass, so you can't get it by sitting in a sun room. 3) You should only sit in the sun until your skin turns slightly red. If you tan easy, you will need more and more time in the sun. The darker you get, the more time you will need to spend in the sun. And the more time you spend in the sun, the darker you will get.
My skin doesn't make enough D3 so I'm now taking 1,000 IU per day. I started with 600 IU and worked my way up. On my next blood test I'll see how it's going.
Good warning, Senior. I have always believed that large doses can be bad. My two vitamin books recommend a certain amount based on age. Large doses are not recommended.
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