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Too much vitamin C can be bad for people, according to WebMD. Overdosing on vitamin C can lead to stomach cramps, nausea and diarrhea. It commonly results from taking too many supplements. More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements

A person can take too much vitamin C under certain circumstances. Vitamin C is water soluble, which means that the body flushes out the vitamin C it doesn't need; however, people who take megadoses of vitamin C can exper... More »

www.reference.com Health Nutrition & Diets Nutritional Amounts & Limits

Too much vitamin C, a water-soluble vitamin, is not usually harmful; however, large doses of supplements containing it sometimes lead to gastric upset, headaches and insomnia, according to Mayo Clinic. The recommended da... More »

www.reference.com Health Nutrition & Diets Nutritional Amounts & Limits
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Side effects from a standard dosage of vitamin C can include heartburn, stomach cramps, nausea, vomiting, headache and others, according to WebMD. High daily doses of vitamin C may cause numerous side effects, including ... More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements

Vitamin C may help those with immune systems weakened by stress; may reduce the risk of stroke; reduces complications from colds and flu; and improves skin health, explains WebMD. These benefits to the body were discover... More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements

High vitamin B-12 values are most often found in people who have some form of leukemia and in those who have liver disease, according to WebMD. In rare cases, high vitamin B-12 levels may be found in people who are obese... More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements

Increased intake of vitamin D is recommended in cases of vitamin D deficiency, according to WebMD. Deficiency of vitamin D occurs in people who avoid sunlight and have dark skin or in people who do not consume enough vit... More »

www.reference.com Health Medications & Vitamins Vitamins & Supplements