Nov 3rd 2025
You May Not Be Taking Enough Vitamin D
. . . or getting the most benefit from that vitamin D you're takingYou may have heard that vitamin D is important and checked your multi to make sure it includes vitamin D. If it’s our multi, and you’re taking 2 tablets a day, you’re getting 800 IU of the highest quality vitamin D3 available. Noting that this is more than the Recommended Daily Allowance for most people, you may assume you’re getting enough.Or maybe you spend a lot of time in the sun during the summer months soaking up those vitamin-D producing UV rays. Again, you may assume your vitamin D blood levels are more than adequate.In both cases you may be wrong.Vitamin D experts recommend that you maintain a blood level of vitamin D in the upper-normal range, which would be 50 ng/mL or more on the 25(OH)D test. But in a 2006 study, Bischoff-Ferrari and colleagues found that 700-1,000 IU of vitamin D taken for eight weeks resulted in less than half of average healthy adults achieving 30 ng/mL. This is the low edge of the norma…
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