What's the most vitamin C to take in a day?

The upper limit for all adults is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, large doses of vitamin C supplements might cause: Diarrhea.

mayoclinic.org - Too much vitamin C: Is it harmful? - Mayo Clinic

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Is it possible to take too much vitamin C? Answer From Katherine Zeratsky, R.D., L.D. Vitamin C is an essential nutrient. But you can get too much of it. Vitamin C (ascorbic acid) is a water-soluble vitamin that supports growth and development. It also helps your body absorb iron. Because your body doesn't make or store vitamin C, it's important to include vitamin C in your diet. Most people can get enough vitamin C for the day in their food. An orange or a cup of strawberries, chopped red pepper or broccoli provides enough vitamin C for the day. The recommended daily amount for vitamin C is 75 milligrams (mg) a day for women and 90 mg a day for men. During pregnancy, 120 mg a day are recommended. The upper limit for all adults is 2,000 mg a day. Although too much dietary vitamin C is unlikely to be harmful, large doses of vitamin C supplements might cause:

Diarrhea

Nausea

Vomiting

Heartburn

Stomach (abdominal) cramps

Headache

Remember, for most people, a healthy diet provides enough vitamin C.

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What not to take with vitamin C?

It can interact with drugs like aspirin, acetaminophen, antacids, and blood thinners. Nicotine may reduce the effects of vitamin C. Risks. People who are pregnant or have gout, liver disease, kidney disease, and other chronic diseases should check with a doctor before using high doses of vitamin C supplements.

webmd.com - Vitamin C (Ascorbic Acid): Antioxidant Used for Colds and Other ... - WebMD

Vitamin C ( ascorbic acid ) helps tissue and bone grow and repair themselves. While vitamin C supplements are extremely popular, research has yet to establish solid health benefits.

Why do people take vitamin C?

Studies have shown that vitamin C may reduce the odds of getting a cold, but only in specific groups in extreme circumstances, such as soldiers in subarctic environments, skiers, and marathon runners. Studies have not found solid evidence that vitamin C helps prevent or treat colds in average situations. Vitamin C's antioxidant benefits are also unclear. While some studies of vitamin C supplements have been promising, they have not found solid evidence that vitamin C supplements help with cancer, stroke, asthma, and many other diseases. Some evidence suggests that vitamin C may be helpful in people who have high cholesterol and in preventing cataracts, but more studies are needed to prove these effects. Data on vitamin C and heart disease are mixed. Some studies show an association between low levels of vitamin C and heart disease risk, yet many studies have linked the use of vitamin C supplements with an increased risk of heart disease.

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