You can have too much of a good thing, including vitamins and minerals. Supplements can bolster deficient diets, but taking too many can produce side effects. If you’re eating a balanced diet and don’t have any health problems, you may not need any additional nutrients—especially not mega-doses—despite what supplement companies say. What the body doesn’t use it usually flushes away.
Taking too much vitamin C may cause kidney stones, nausea, gastritis and severe diarrhea, according to the Mayo Clinic. Take too much selenium, say the National Institutes of Health, and you could feel sluggish, nauseous and irritable. And remember, just because something is labeled “natural” or “organic” doesn’t mean it can’t interact with medications to affect blood pressure, diabetes or other conditions. Always check with your doctor before adding supplements to your diet.
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