Megavitamin therapy is the use of large doses of

vitamin A vitamin is an organic molecule (or a set of molecules closely related chemically, i.e. vitamers) that is an essential micronutrient that an organism needs in small quantities for the proper functioning of its metabolism. Essential nutrie ...

s, often many times greater than the recommended dietary allowance (RDA) in the attempt to prevent or treat

disease A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not immediately due to any external injury. Diseases are often known to be medical conditions that a ...

s. Megavitamin therapy is typically used in alternative medicine by practitioners who call their approach

orthomolecular medicine Orthomolecular medicine is a form of alternative medicine that aims to maintain human health through nutritional supplementation. The concept builds on the idea of an optimal nutritional environment in the body and suggests that diseases reflect ...

. 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. Critics have described some aspects of orthomolecular medicine as

food faddism A fad diet is a diet that becomes popular for a short time, similar to fads in fashion, without being a standard dietary recommendation, and often making unreasonable claims for fast weight loss or health improvements. There is no single defin ...

or even

quackery Quackery, often synonymous with health fraud, is the promotion of fraudulent or ignorant medical practices. A quack is a "fraudulent or ignorant pretender to medical skill" or "a person who pretends, professionally or publicly, to have skill, ...

. A short summary is i
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.

Multivitamin vs megavitamin

Megavitamin therapy must be distinguished from the usual "vitamin supplementation" approach of traditional multivitamin pills. Megavitamin doses are far higher than the levels of vitamins ordinarily available through western diets. A study of 161,000 individuals (post-menopausal women) provided, in the words of the authors, "convincing evidence that multivitamin use has little or no influence on the risk of common cancers, cardiovascular disease, or total mortality in postmenopausal women".

History

In the 1930s and 1940s, some scientific and clinical evidence suggested that there might be beneficial uses of vitamins C, E, and niacin in large doses. Beginning in the 1930s in

Canada Canada is a country in North America. Its ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, covering over , making it the world's second-largest country by tot ...

, a megadose vitamin E therapy for cardiovascular and circulatory complaints was developed by

Evan Shute Evan Vere Shute (21 October 1905 – 1978) F.R.C.S.C. was a Canadian obstetrician, poet and writer best known for advocating vitamin E therapy to treat cardiovascular disease and many other diseases. His studies were not controlled and his resu ...

and colleagues, named the "Shute protocol". Tentative experiments in the 1930s by Claus W. Jungeblut with larger doses of vitamin C led to Frederick Klenner's development of megadose intravenous vitamin C treatments for polio and other viruses in the 1940s. William Kaufman published articles in the 1940s that detailed his treatment of arthritis with frequent, high doses of niacinamide. Rudolf Altschul and

Abram Hoffer Abram Hoffer (November 11, 1917 – May 27, 2009) was a Canadian biochemist, physician, and psychiatrist known for his "adrenochrome hypothesis" of schizoaffective disorders. According to Hoffer, megavitamin therapy and other nutritional interven ...

applied large doses of the immediate release form of

niacin Niacin, also known as nicotinic acid, is an organic compound and a form of vitamin B3, an essential human nutrient. It can be manufactured by plants and animals from the amino acid tryptophan. Niacin is obtained in the diet from a variet ...

(Vitamin B₃) to treat

hypercholesterolemia Hypercholesterolemia, also called high cholesterol, is the presence of high levels of cholesterol in the blood. It is a form of hyperlipidemia (high levels of lipids in the blood), hyperlipoproteinemia (high levels of lipoproteins in the blood), ...

. In a 1956 publication entitled ''Biochemical Individuality'',

Roger J. Williams Roger John Williams (August 14, 1893 – February 20, 1988), was an American biochemist. He is known for is work on vitamins and human nutrition. He had leading roles in the discovery of folic acid, pantothenic acid, vitamin B6, lipoic acid ...

introduced concepts for individualized megavitamins and nutrients. Megavitamin therapies were also publicly advocated by Linus Pauling in the late 1960s.

Usage as therapy

Although megavitamin therapies still largely remain outside of the structure of evidence-based medicine, they are increasingly used by patients, with or without the approval of their treating physicians, often after recommendations by practitioners of orthomolecular and

naturopathic medicine Naturopathy, or naturopathic medicine, is a form of alternative medicine. A wide array of pseudoscientific practices branded as "natural", "non-invasive", or promoting "self-healing" are employed by its practitioners, who are known as natur ...

. The proposed efficacy of various megavitamin therapies to reduce cancer risk has been contradicted by results of one clinical trial.

Vitamin C

The US Recommended Dietary Allowance for

vitamin C Vitamin C (also known as ascorbic acid and ascorbate) is a water-soluble vitamin found in citrus and other fruits and vegetables, also sold as a dietary supplement and as a topical 'serum' ingredient to treat melasma (dark pigment spots) ...

for adult women is 76 mg/day and for adult men 90 mg/day. Although Linus Pauling was known for highly respectable research in chemistry and biochemistry, he was also known for promoting the consumption of vitamin C in large doses. Although he claimed and stood firm in his claim that consuming over 1,000 mg is helpful for one’s immune system when fighting a head cold, the results of empirical research do not align with this view. A meta-analysis concluded that supplementary vitamin C significantly lowered serum

uric acid Uric acid is a heterocyclic compound of carbon, nitrogen, oxygen, and hydrogen with the formula C5H4N4O3. It forms ions and salts known as urates and acid urates, such as ammonium acid urate. Uric acid is a product of the metabolic breakdown ...

, considered a risk factor for

gout Gout ( ) is a form of inflammatory arthritis characterized by recurrent attacks of a red, tender, hot and swollen joint, caused by deposition of monosodium urate monohydrate crystals. Pain typically comes on rapidly, reaching maximal intens ...

. One population study reported an inverse correlation between dietary vitamin C and risk of gout. A review of clinical trials in the treatment of colds with small and large doses of Vitamin C has established that there is no evidence that it decreases the incidence of common colds. After 33 years of research, it is still not established whether vitamin C can be used as a treatment for cancer.

Vitamin E

The US Recommended Dietary Allowance for

vitamin E Vitamin E is a group of eight fat soluble compounds that include four tocopherols and four tocotrienols. Vitamin E deficiency, which is rare and usually due to an underlying problem with digesting dietary fat rather than from a diet low in vi ...

for adult women and men is 15 mg/day. 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. In the US, the popularity for vitamin E as a dietary supplement–popular doses 400, 800 and 1000 IU/day–peaked around 2000. Declines in usage were attributed to publications of studies that showed either no benefits or negative consequences from vitamin E supplements. One meta-analysis showed no association between vitamin E supplementation and cardiovascular events (nonfatal stroke or myocardial infarction) or cardiovascular mortality. Another meta-analysis concluded that high-dosage vitamin E increased all-cause mortality.

Niacin

The US Recommended Dietary Allowance for

for adult women is 14 mg/day and for adult men 16 mg/day. Niacin is available as a prescription product, either immediate release (500 mg tablets; prescribed up to 3,000 mg/day) or extended release (500 and 1,000 mg tablets; prescribed up to 2,000 mg/day). In the US, niacin is also available as a dietary supplement at 500 to 1,000 mg/tablet. Niacin has sometimes been used in combination with other

lipid-lowering medication Lipid-lowering agents, also sometimes referred to as hypolipidemic agents, cholesterol-lowering drugs, or antihyperlipidemic agents are a diverse group of pharmaceuticals that are used to lower the level of lipids and lipoproteins such as cholestero ...

s.Niacin tablet label
Updated March 14, 2013. Page accessed Feb 11, 2016 Systematic reviews found no effect of niacin on cardiovascular disease or death, in spite of raising

high-density lipoprotein High-density lipoprotein (HDL) is one of the five major groups of lipoproteins. Lipoproteins are complex particles composed of multiple proteins which transport all fat molecules (lipids) around the body within the water outside cells. They are t ...

(HDL) cholesterol. Reported side effects include an increased risk of

diabetes Diabetes, also known as diabetes mellitus, is a group of metabolic disorders characterized by a high blood sugar level ( hyperglycemia) over a prolonged period of time. Symptoms often include frequent urination, increased thirst and increased ...

References

External links

Orthomolecular Therapy
at

Quackwatch Quackwatch is a United States-based website, self-described as a "network of people" founded by Stephen Barrett, which aims to "combat health-related frauds, myths, fads, fallacies, and misconduct" and to focus on "quackery-related information th ...

{{DEFAULTSORT:Megavitamin Therapy Orthomolecular medicine Vitamins Medical treatments Therapy

Multivitamin vs megavitamin

History

Usage as therapy

Vitamin C

Vitamin E

Niacin

See also

References

External links