Megavitamin therapy is the use of large doses of vitamins, often many times greater than the recommended dietary allowance (RDA) in the attempt to prevent or treat diseases. Megavitamin therapy is typically used in alternative medicine by practitioners who call their approach orthomolecular medicine. Vitamins are useful in preventing and treating illnesses specifically associated with dietary vitamin shortfalls, but the conclusions of some medical research are that the  claims of disease treatment by advocates of megavitamin therapy are unsubstantiated by the available evidence. This seems to point to doses of any vitamin greatly in excess of nutritional requirements resulting either in toxicity (vitamins A and D) or in the excess simply being metabolised; thus the evidence in favour of vitamin supplementation supports only doses in the normal range.Novella, S: Medical Myths, Lies, and Half-Truths: What We Think We Know May Be Hurting Us, The Great Courses Critics have described some aspects of orthomolecular medicine as food faddism or even quackery. A short summary is in the journal's preface. Research on nutrient supplementation in general suggests that some nutritional supplements might be beneficial, and that others might be harmful; several specific nutritional therapies are associated with an increased likelihood of the condition they are meant to prevent.
Megavitamin therapy is the use of large doses of vitamins, often many times greater than the recommended dietary allowance (RDA) in the attempt to prevent or treat diseases. Megavitamin therapy is typically used in alternative medicine by practitioners who call their approach orthomolecular medicine. Vitamins are useful in preventing and treating illnesses specifically associated with dietary vitamin shortfalls, but the conclusions of medical research are that the broad claims of disease treatment by advocates of megavitamin therapy are unsubstantiated by the available evidence. It is generally accepted that doses of any vitamin greatly in excess of nutritional requirements will result either in toxicity (vitamins A and D) or in the excess simply being metabolised; thus evidence in favour of vitamin supplementation supports only doses in the normal range.Novella, S: Medical Myths, Lies, and Half-Truths: What We Think We Know May Be Hurting Us, The Great Courses Critics have described some aspects of orthomolecular medicine as food faddism or even quackery. A short summary is in the journal's preface. Research on nutrient supplementation in general suggests that some nutritional supplements might be beneficial, and that others might be harmful; several specific nutritional therapies are associated with an increased likelihood of the condition they are meant to prevent.
D
some
A
broad
R
This seems to point to
It is generally accepted that
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resulting
will result
D
the