![]() ![]() An upper intake level of 2 g/day is recommended in order to prevent some adults from experiencing diarrhea and gastrointestinal disturbances. There is no scientific evidence that large amounts of vitamin C (up to 10 grams /day in adults) exert any adverse or toxic effects. ![]() Vitamin C supplements are available in many forms, but there is little scientific evidence that any one form is better absorbed or more effective than another. Taking supplements once cold symptoms have already begun has no proven benefits. Overall, regular use of vitamin C supplements shortens the duration of the common cold but does not reduce the risk of becoming ill. ![]() There is a need for large, longer-duration phase II clinical trials that test the efficacy of intravenous vitamin C in cancer progression and overall survival. ![]() (More information)Ĭurrent evidence of the efficacy of intravenous vitamin C in cancer patients is limited to observational studies, uncontrolled interventions, and case reports. Randomized controlled trials have reported no effect of vitamin C supplementation on cancer risk. Most observational studies examining vitamin C intake in relation to cancer incidence have found no association. There are insufficient data to suggest a link between vitamin C status and the risk of developing a given type of cancer. There is some evidence to suggest that vitamin C may be a useful adjunct to conventional medical practice to reduce myocardial injury and arrhythmia following a cardiac procedure or surgery in patients with cardiovascular disease.
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