Wondering what level your D3 should be? Check out this blogger's thoughts... (Mark Sisson).
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A good general rule is 4000 IU per day supplemented. That's what I take during winter time and when I go a few days trapped indoors and without sun (as I was last weekend while at the Book Expo of America in New York). Get your 25(OH)D levels tested before you start supplementation, take the 4k IU daily, and get them tested again after two months. Aim to get your levels up around 50-60 ng/mL, which is where most of the big benefits seem to kick in. If you don't respond well to 4000 IU, feel free to increase the dosage. Given that we can make around 10,000 IU in well under an hour, supplementation up to that level is well tolerated.
Other doctors/experts say 5,000-6,000 a day for an adult without an infection - more otherwise.
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>>Carl<<
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