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Vitamin C megadosage is a term describing the consumption or injection of vitamin C (ascorbic acid) in doses well beyond the current United States Recommended Dietary Allowance of 90 milligrams per day, and often well beyond the tolerable upper intake level of 2,000 milligrams per day. [1]
There is no evidence to indicate that intravenous ascorbic acid therapy can cure cancer. [33] [32] According to the U.S. Food and Drug Administration (FDA), high-dose vitamin C (such as intravenous ascorbic acid therapy) has not been approved as a treatment for cancer or any other medical condition. [2]
The US Recommended Dietary Allowance for vitamin C for adult women is 76 mg/day and for adult men 90 mg/day. Although Linus Pauling was known for highly respectable research in chemistry and biochemistry, he was also known for promoting the consumption of vitamin C in large doses. [25]
Taking a daily multivitamin can also provide a little additional vitamin C, often about 100 mg per supplement, so an additional high dose vitamin C supplement is not necessary,” says Braslow.
Concerns about possible adverse effects are that intravenous high-dose vitamin C leads to a supraphysiological level of vitamin C followed by oxidative degradation to dehydroascorbic acid and hence to oxalate, increasing the risk of oxalate kidney stones and oxalate nephropathy.
The NIH recommends that most adults consume no more than 100 total micrograms of vitamin D per day. At very high doses, vitamin D may contribute to a range of side effects and complications ...
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