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Vitamin C supplements among other dietary supplements at a US drug store. Vitamin C has a definitive role in treating scurvy, which is a disease caused by vitamin C deficiency. Beyond that, a role for vitamin C as prevention or treatment for various diseases is disputed, with reviews often reporting conflicting results.
The Pauling's book How to Live Longer and Feel Better, [92] first published in 1986, [93] was a bestseller and advocated taking more than 10 grams per day orally, thus approaching the amounts released by the liver directly into the circulation in other mammals: an adult goat, a typical example of a vitamin C–producing animal, will manufacture ...
Since the first claims of medical breakthroughs with vitamin C by Pauling and others, findings on the health effects of vitamin C have been controversial and contradictory. [33] [34] Pauling's claims have been criticised as overbroad. [35] Later research branched out into nutrients besides niacin and vitamin C, including essential fatty acids. [36]
[10] [11] A systematic review of trials in 2021 found that the claimed benefits of the protocol could not be confirmed. [12] People in sepsis may have micronutrient deficiencies, including low levels of vitamin C. [13] Reviews mention that an intake of 3.0 g/day via intravenous administration may needed to maintain normal plasma concentrations.
Second, the adult tablet contains 1 g of vitamin C, and the directions for use advise taking 1 tablet at the first sign of a cold and repeating the dose every 3 hours as necessary, but no more than three servings a day. Vitamin C in doses higher than 1 g increases oxalate and urate excretion and may cause kidney stones. [11]
In the United States, the Dietary Supplement Health and Education Act of 1994 provides this description: "The Dietary Supplement Health and Education Act of 1994 (DSHEA) defines the term "dietary supplement" to mean a product (other than tobacco) intended to supplement the diet that bears or contains one or more of the following dietary ingredients: a vitamin, a mineral, an herb or other ...
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