The government says 2,000 units of vitamin D a day is safe for all adults to take without a doctors supervision. All-trans retinoic acid antagonizes the action of calciferol and its active metabolite, 1,25-dihydroxycholecalciferol, in rats. Vitamin A antagonizes calcium response to vitamin D in man. Vitamin A antagonizes the action of vitamin D in rats. Rohde CM, Manatt M, Clagett-Dame M, DeLuca HF. Get your vitamin D by taking vitamin D or by going into the sun, or by combining both. Get your omega-3s from molecularly distilled fish body oils (Trader Joe's) or by eating wild salmon or sardines. I do not advise cod liver oil if you just have to take it, don't take more than 1 teaspoon per day. Beta-carotene is okay, but pre-formed retinols (vitamin A) interfere with vitamin D's function. Just be sure they don't contain any vitamin A. Your local health food store should also carry 1,000 unit capsules. Two-hundred and fifty of the 1,000 unit capsules cost about $10. Life Extension Foundation sells an inexpensive pharmaceutical grade of vitamin D. However, an easy answer is: 2,000 units a day. We don't know for sure-around 50 ng/mL is the best current guess. The question also assumes we know the ideal vitamin D blood level. You see, the answer is different for everyone.
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