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Long-term use of zinc in high doses, for example, can cause a copper deficiency; high doses of vitamin A shouldn’t be taken during pregnancy because it can hurt the fetus; and excessive vitamin ...
Here are the vitamins and supplements you should actually take -- and the ones you should avoid: Multivitamins: Skip them -- you get everything you need with a balanced diet.
When you buy a bottle of vitamins from a nutrition store, you’ll probably notice a best-by date on the bottom of the jar. But that inscribed number isn’t a hard-and-fast rule—there is some ...
Some women may need to take iron, vitamin C, or calcium supplements during pregnancy, but only on the advice of a doctor. In the 1999–2000 National Health and Nutrition Examination Survey , 52% of adults in the United States reported taking at least one dietary supplement in the last month and 35% reported regular use of multivitamin ...
“Huge doses of a vital vitamin may not be as good as we once thought, so it’s always best to get your vitamins from food sources and try your best not to go to extremes.” Dr. Hazen agrees.
Europe has regulations that define limits of vitamin (and mineral) dosages for their safe use as dietary supplements. Most vitamins that are sold as dietary supplements are not supposed to exceed a maximum daily dosage referred to as the tolerable upper intake level (UL or Upper Limit).
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