However, too much vitamin D might lead to nausea, vomiting, constipation, and even weakness. And since vitamin D boosts calcium absorption, all the amounts above the upper limit might increase the risks from both these nutrients.
So if you’re wondering if you should take the supplement or not, the answer is probably no. Most adults don’t even need one. However, after age 70, your bones will need more vitamin D, so Dr. Rosen would recommend you take an extra 400 IU on a daily basis.
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