Vitamin amino acids. Most vitamins are not single molecules, but groups of related molecules called vitamers. For example, vitamin E consists of four tocopherols and four tocotrienols. The thirteen vitamins required by human metabolism are: vitamin A (retinols and carotenoids), vitamin B (thiamine), vitamin B (riboflavin), vitamin B (niacin), vitamin B (pantothenic acid), vitamin B (pyridoxine), vitamin B (biotin), vitamin B (folic acid or folate), vitamin B (cobalamins), vitamin C (ascorbic acid), vitamin D (calciferols), vitamin E (tocopherols and tocotrienols), and vitamin K (quinones). Vitamins have diverse biochemical functions. Some forms of vitamin A function as regulators of cell and tissue
Vitamin C megadosage what the recommended dose of Vitamin C is, if there is indeed such a dose, that can produce an anti-tumor response." The American Cancer Society has stated, "Although high doses of vitamin C have been suggested as a cancer treatment, the available evidence from clinical trials has not shown any benefit." One clinical trial used high intravenous doses of vitamin C (66 mg/kg/hour over 24 hours, for a total dose of around 110 grams) after severe burn injury, but despite being described as promising, it has not been replicated by independent institutions and thus is not a widely accepted treatment.