Vitamin B 12 is available only in animal foods (meat and dairy products) or yeast extracts (such as brewer's yeast). Vitamin B 12 deficiency is defined by low levels of stored B 12 in the body that can result in anemia, a lower-than-normal number of red blood cells. Vitamin B 12 deficiency can develop for the following reasons:
Interest in using very high doses of vitamin C as a cancer treatment began as long ago as the 1970s when it was discovered that some properties of the vitamin may make it toxic to cancer cells. Initial studies in humans had promising results, but these studies were later found to be flawed. Subsequent well-designed, randomized, controlled