While enough vitamin D is great, too much ain't. Taking more than 10,000 IU per day, for example, might make you absorb too much D and too much calcium, causing kidney damage. (Dialysis anyone? We thought not.) And although enough D helps bones, older women who took gigantic 550,000 IU doses every fall or winter for three to five years in one study had more fractures and more falls than those who got no extra D. Same goes for blood vessels: Too much not only nixes benefits, it stiffens your arteries.
Why can excess D double-cross you? Big doses seem to steal calcium from your bones and spew it into your bloodstream, interfering with muscle function and putting your arteries and kidneys in peril.
While enough vitamin D is great, too much ain't. Taking more than
10,000 IU per day, for example, might make you absorb too much D
and too much calcium, causing kidney damage. (Dialysis anyone? We
thought not.) And although enough D helps...
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Dr. Michael Roizen answered:While enough vitamin D is great, too much ain't. Taking more than 10,000 IU per day, for example, might make you absorb too much D and too much calcium, causing kidney damage. (Dialysis anyone? We thought not.) And although enough D helps bones, older women who took gigantic 550,000 IU doses every fall or winter for three to five years in one study had more fractures and more falls than those who got no extra D. Same goes for blood vessels: Too much not only nixes benefits, it stiffens your arteries.
