美国梅奥诊所：可以摄入过量的维生素C吗？

来自Katherine Zeratsky, R.D., L.D. 的回答。 Vitamin C (ascorbic acid) is an essential nutrient. Still, it's possible to have too much vitamin C. Vitamin C is a water-soluble vitamin that supports normal growth and development. Vitamin C also helps your body absorb iron. Because your body doesn't produce or store vitamin C, it's important to include vitamin C in your diet. For most people, a large orange, 1 cup (about 165 grams) of sliced strawberries, chopped red pepper or broccoli provide enough vitamin C for the day. Any extra vitamin C will simply be flushed out of your body in your urine. For adults, the recommended dietary reference intake 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 may cause: •Diarrhea •Nausea •Vomiting •Heartburn •Abdominal bloating and cramps •Headache •Insomnia •Kidney stones Remember, for most people, a healthy diet provides an adequate amount of vitamin C. 中文翻译： 本文地址：http://www.wjbb.com/know/604 原文出处：http://www.mayoclinic.org/healthy-living/nutrition-and-healthy-eating/expert-answers/vitamin-c/faq-20058030