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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]
0.8 to 1.1 mg/100 g Vitamin D: 15 to 20 μg/100 g Vitamin E: 20 mg/100 g minimum Vitamin K: 15 to 30 μg/100 g Vitamin B1: 0.5 mg/100 g minimum Vitamin B2: 1.6 mg/100 g minimum Vitamin C: 50 mg/100 g minimum Vitamin B6: 0.6 mg/100 g minimum Vitamin B12: 1.6 μg/100 g minimum Folic acid: 200 μg/100 g minimum Niacin: 5 mg/100 g minimum ...
In 2000, the chapter on Vitamin C in the North American Dietary Reference Intake was updated to give the Recommended Dietary Allowance (RDA) as 90 milligrams per day for adult men, 75 mg/day for adult women, and setting a Tolerable upper intake level (UL) for adults of 2,000 mg/day.
Tolerable upper intake levels (UL), to caution against excessive intake of nutrients (like vitamin A and selenium) that can be harmful in large amounts. This is the highest level of sustained daily nutrient consumption that is considered to be safe for, and cause no side effects in, 97.5% of healthy individuals in each life stage and sex group.
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The US Food and Nutrition Board set a tolerable upper intake level (UL) at 1,000 mg (1,500 IU) per day derived from animal models that demonstrated bleeding at high doses. [30] In the US, the popularity for vitamin E as a dietary supplement peaked around 2000, with popular doses of 400, 800 and 1000 IU/day.