I live in the Northeast. My levels were 29 a couple of winters ago. My doctor put me on 50,000IU once a week and had me continue to take 5,000IU a day on top of that. After 8 weeks when the prescription was finished, she had advised me to continue with the 5,000/day, but I kept forgetting. A month and a half later I had my levels tested again (this was the beginning of spring in the Northeast, so very little UV exposure) my levels had only gone up to 32.
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Fast forward to this past spring, I started religiously taking 8,000IU/day of D3 on my own. I may have skipped a day here or there, but I was tested after a couple of months and my levels had gone to 52. About once a week, instead of my regular D3 pills, I also took some Vit D3 multi-vitamins containing Vit K, magnesium, and some other vitamins/minerals that I can't remember off-hand....they help your body better absorb the Vit D. The multi was pricey, though, which is why I didn't take it every day....(I buy them from Purity Products...it's Dr. Cannell's Vit D multi). But you could certainly supplement them separately or be sure to eat foods rich in them.
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BTW, I was (and still am) nursing.
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Vitamin D scientists say that to maintain existing levels, you should take 1,000IU per day per 25 lbs of body weight. So, if your levels are low, you will need to take more than the maintenance level. My maintenance level is 5,000IU/day, so I took 3,000 more. During this past summer, I was in the sun a lot during peak hours, so I haven't supplemented much at all. I have just begun supplementing again at my maintenance level and will test again soon to see where I'm at. My doc likes to have me tested every 3 mths.
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Check out the Vitamin D Council's blog or the Vitamin D Foundation's website for lots of information.
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Good luck!