Quote:
Originally Posted by Villages PL
Your link, under "industrial production", tells how D3 is produced from sheep's wool. That must be the standard way of producing it. When I called the company that makes my liquid form of D3 they told me it was produced from sheep's wool. I suppose it doesn't matter where it comes from as long as it is chemically the same as what we would produce by exposing ourselves to sunlight. D3 is D3 regardless where it comes from.
Toxicity: I have two vitamin books by different authors and they make recommendations based on age, just as your link does under "dose". For those under 70 it's 600 IU per day and for those over 70 it is 800 IU per day.
My personal opinion is: Going over the recommended dosage could be toxic to certain individuals, depending on their health status. It might build up to a toxic level if the person has a slow metabolism.
After getting my blood tested for D3 (I had to ask for it.) my doctor recommended a large dose. Long story short, I couldn't tolerate a large dose. The symptom I got was pressure building up in my head. I decided to trust the recommendations from my 2 vitamin books. But when I went shopping for 800 IU of D3 I found that it doesn't exist. So I ended up buying it in liquid form. The bottle comes with an eye dropper and each drop provides 200 IU.
My last blood test indicated I was low so I have now increased the number of drops to 5. That's 1,000 IU and I will be retested later this year. The funny thing is I once tried a 1,000 IU tablet and could not tolerate it. After several days it seemed to build up in my system, but the liquid form is not doing that.
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I had blood work done a few months ago and was low in D3 so the doctor recommended I take 2000 IU daily. After reading this thread I am concerned this is too much. I am 58 and according to your information should be taking 600IU. On top of that I have been feeling odd lately but did not associate it with Vitamin D until now.
I will do research and decide if I should keep taking it or lower the dose. Summer is right around the corner here and would prefer to get this vitamin through sunshine.