what are the side effects of too much vit c?
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['Diarrhea.', 'Nausea.', 'Vomiting.', 'Heartburn.', 'Abdominal cramps.', 'Headache.', 'Insomnia.']
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However, supplementing with excessively high levels of B12 has been linked to some negative side effects. Several studies have shown that megadoses of the vitamin can lead to outbreaks of acne and rosacea, a skin condition that causes redness and pus-filled bumps on the face.
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In some people, vitamin C might cause nausea, vomiting, heartburn, stomach cramps, headache, and other side effects. The chance of getting these side effects increases the more vitamin C you take.
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Too much vitamin A can cause liver damage, as can high doses of niacin. (Be aware that energy drinks and shots often contain high doses of niacin, and a case of acute hepatitis due to excessive intake of niacin from energy drinks has been reported.)
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Vitamin C is generally considered safe because your body gets rid of what it does not use. But at high doses (more than 2,000 mg daily) it can cause diarrhea, gas, or stomach upset. If you experience these side effects, lower the dose of vitamin C.
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['Rash.', 'Diarrhea.', 'Nausea.', 'Vomiting.', 'Headache.', 'Tendon or nerve damage.']
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Signs of too much zinc include nausea, vomiting, loss of appetite, stomach cramps, diarrhea, and headaches. When people take too much zinc for a long time, they sometimes have problems such as low copper levels, lower immunity, and low levels of HDL cholesterol (the "good" cholesterol).
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['nausea.', 'constipation.', 'pain.', 'fatigue.', 'frequent infections.', 'weight loss.', 'muscle weakness.', 'increased thirst.']
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['excessive thirst.', 'skin conditions.', 'blurry vision.', 'abdominal cramps.', 'nausea.', 'vomiting.', 'increased urination.', 'diarrhea.']
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Many multivitamin products also contain minerals such as calcium, iron, magnesium, potassium, and zinc. Minerals (especially taken in large doses) can cause side effects such as tooth staining, increased urination, stomach bleeding, uneven heart rate, confusion, and muscle weakness or limp feeling.
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In fact, too much vitamin B6 can cause nerve problems, too much vitamin C can cause kidney stones, and too much folic acid may mask vitamin B12 deficiency.
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The main consequence of vitamin D toxicity is a buildup of calcium in your blood (hypercalcemia), which can cause nausea and vomiting, weakness, and frequent urination. Vitamin D toxicity might progress to bone pain and kidney problems, such as the formation of calcium stones.
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There are no known toxic side effects of taking too much lutein or zeaxanthin. In some cases, people who eat large amounts of carrots or yellow and green citrus fruits can develop a harmless yellowing of the skin called carotenemia.
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For adults, the recommended daily amount for vitamin C is 65 to 90 milligrams (mg) a day, and the upper limit is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, megadoses of vitamin C supplements might cause: Diarrhea.
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Other symptoms of taking too much niacin include severe skin flushing combined with dizziness, rapid heartbeat, itching, nausea and vomiting, abdominal pain, diarrhoea and gout. According to the Mayo Clinic, it is not possible to overdose by eating too many niacin-rich foods.
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['Diarrhea.', 'Nausea.', 'Stomach pain or upset.', 'Vomiting.', 'Contact dermatitis.', 'Stevens-Johnson syndrome.', 'Hypersensitivity reactions.', 'Skin irritation or redness.']
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['Nausea and vomiting.', 'Diarrhea.', 'Rash.', 'Headache.', 'Fatigue.', 'Lower blood cell counts.']