Vitamin B17 - What Is It?

Any type of searching around on the internet for cancer prevention will bring up results for vitamin B17. This usually puzzles people, because most people have never even heard of this B vitamin.

Sure, everyone has heard about B vitamins-many people even routinely take a Vitamin B Complex tablet every day that consists of the eight essential B vitamins. However, vitamin B17 is certainly not one of those in the Vitamin B Complex; nor is it one about which most people are even aware.

What is this B Vitamin?

Vitamin B17-which has a chemical name of laetrile--is basically the purified form of amygdalin. Amygdalin is a substance that is most prevalent in apricot seeds, though it is also present in some other foods.

It can be ingested either through eating apricot seeds (or, in much smaller amounts, by eating other foods which contain the substance). Or, it can be taken in pill form. Tablets are typically available in either 100mg or 500mg concentrations.

What is Vitamin B17 for?

Laetrile, or vitamin B17, can be used to prevent cancer. In stronger doses, people have reported that it has been quite successful in the treatment of cancer as well; however, this is not its main purpose. It is intended to be used as a cancer prevention measure.

It works by destroying all of the 'bad' cells that are present in your body. Scientists have proven that our bodies are continually making cancerous cells; taking vitamin B17 (laetrile) on a regular basis can work to rid the body of those cancerous cells.

How does it work?

Laetrile has a dangerous component-cyanide-locked away inside. The only way that can get unlocked and come out is if the laetrile comes into contact with a cancerous cell. Cancer cells have an enzyme that unlocks that cyanide, so to speak and the cyanide comes out and destroys the cancer cells. When the cyanide comes out, a neutralizing substance also comes out that prevents the cyanide from harming any nearby healthy cells.

By taking vitamin B17 daily, cancer cells never have a chance to develop because the laetrile destroys them too quickly.

So, it will make a lot of people interested to know that vitamin B17 comes from something completely natural-apricot seeds.

Preventing Cancer - Naturally

Yes,vitamin B-17 is a natural product, as its source is just a regular, everyday, common fruit. Apricot seeds are what make up vitamin B-17, that's it. This vitamin is a purified form of the substance that is found inside apricot seeds. This substance is called amygdalin, and it is what is used to create vitamin B-17.

That makes taking vitamin B-17 to prevent cancer completely natural. When you take these vitamin tablets which are available in either 100mg or 500mg strength, you can be confident in knowing that you are taking a natural product.

Apricot Seeds? Really?

It may seem rather strange, but this is, indeed, where vitamin B17 comes from. There's good reasoning behind this,it wasn't done arbitrarily by some vitamin manufacturer. Apricot seeds contain amygdalin. Amygdalin has cyanide locked away, ready to battle cancer and this cyanide can only be unlocked by a cancer cell because only those cells have the special unlocking enzyme. Once unlocked, the cyanide kills the cancer cell. Nearby cells aren't harmed because a neutralizing agent is released with the cyanide to protect those cells.

Once this was discovered, a biochemist studied the substance and learned how to purify it. Then, in 1952, amygdalin was given its vitamin status based (at least partly) upon recommendation from the co-founder of the National Cancer Institute (NCI). Today, the NCI doesn't readily acknowledge the benefits of vitamin B17, though.

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Vitamin B17-Amygdalin

From Wikipedia, the free encyclopedia

IUPAC name

[(6-O-β-D-glucopyranosyl-β-D-glucopyranosyl)oxy](phenyl)acetonitrile

Amygdalin (from Greek: ἀμυγδάλη amygdálē “almond”), C20H27NO11, is a glycoside initially isolated from the seeds of the tree Prunus dulcis, also known as bitter almonds, by Pierre-Jean Robiquet and A. F. Boutron-Charlard in 1830, and subsequently investigated by Liebig and Wöhler in 1830. Several other related species in the genus of Prunus, including apricot (Prunus armeniaca) and black cherry (Prunus serotina), also contain amygdalin.

Since the early 1950s, a modified form of amygdalin has been promoted under the names laetrile and "Vitamin B17" as a cancer cure, but it is not a vitamin, and studies have found it to be ineffective and potentially toxic as a possible cause of cyanide poisoning. The promotion of laetrile to treat cancer has been described in the scientific literature as a canonical example of quackery, with Irving Lerner of the University of Minnesota describing it as "the slickest, most sophisticated, and certainly the most remunerative cancer quack promotion in medical history."

Chemistry

Amygdalin is extracted from almond or apricot kernel cake by boiling in ethanol; on evaporation of the solution and the addition of diethyl ether, amygdalin is precipitated as white minute crystals. Liebig and Wöhler were already able to find three decomposition products of the newly discovered amygdalin: sugar, benzaldehyde, and prussic acid (hydrogen cyanide). Later research showed that sulfuric acid decomposes it into D-glucose, benzaldehyde, and prussic acid; while hydrochloric acid gives mandelic acid, D-glucose, and ammonia.

The decomposition induced by enzymes may occur in two ways. Maltase partially decomposes it, giving D-glucose and mandelic nitrile glucoside, C6H5CH(CN)O·C6H11O5; this compound is isomeric with sambunigrin, a glucoside found by E.E. Bourquelot and Danjou in the berries of the Common Elder, Sambucus nigra. Emulsin, on the other hand, decomposes it into benzaldehyde, cyanide, and two molecules of glucose; this enzyme occurs in the bitter almond, and consequently the seeds invariably contain free cyanide and benzaldehyde. An "amorphous amygdalin" is said to occur in the cherry laurel (Prunus laurocerasus). Closely related to these glucosides is dhurrin, C14H17O7N, isolated by W. Dunstan and T. A. Henry from the common sorghum or "great millet," Sorghum vulgare; this substance is decomposed by emulsin or hydrochloric acid into D-glucose, cyanide, and 4-hydroxybenzaldehyde.

Natural amygdalin has the R configuration at the chiral benzyl center. Under mild basic conditions, this stereogenic center epimerizes; the S epimer is called neoamygdalin.

Laetrile

 

Laetrile (CAS No. 1332-94-1)

Amygdalin is sometimes confused with laevomandelonitrile, also called laetrile for short; however, amygdalin and laetrile are different chemical compounds. Laetrile, which was patented in the United States, is a semi-synthetic molecule sharing part of the amygdalin structure, while the "laetrile" made in Mexico is usually amygdalin, the natural product obtained from crushed apricot pits, or neoamygdalin.

Laetrile has a melting point of 214 to 216 degrees Celsius. Its Chemical Abstracts Service Registry Number is 1332-94-1 and its International Union of Pure and Applied Chemistry nomenclature name is (2S,3S,4S,5R,6R)-6-[(R)-cyano(phenyl)methoxy]-3,4,5-trihydroxyoxane-2-carboxylic acid. Laetrile's chemical formula is C14H15NO7 and its PubChem number is 5484354. Its molecular weight is 309.2714 grams/mole. Laetrile is also classified as a cyanogenic glycoside.

Though it is sometimes sold as "Vitamin B17", it is not a vitamin. Amygdalin/laetrile was claimed to be a vitamin by chemist Ernst T. Krebs in the hope that if classified as a nutritional supplement it would escape the federal legislation regarding the marketing of drugs. He could also capitalise on the public fad for vitamins at that time.

Toxicity

The metabolism of amygdalin produces hydrogen cyanide, a potent toxin. Beta-glucosidase, one of the enzymes that catalyzes the release of cyanide from amygdalin, is present in the human small intestine and in a variety of common foods. This leads to an unpredictable and potentially lethal toxicity when amygdalin or laetrile is taken orally. Ingestion of purified amygdalin or apricot seeds can cause severe toxicity and death due to cyanide poisoning. Numerous case reports in the medical literature describe serious cyanide poisoning in patients who ingested laetrile as a cancer treatment. Blood cyanide concentrations may be measured as a means of confirming the diagnosis in hospitalized patients or to assist in the forensic investigation of a fatal overdose.

Some laetrile promoters have claimed that the cyanide generated by laetrile is harmlessly detoxified by the mitochondrial enzyme rhodanese. However, these claims are false, as regardless of the level of rhodanese present, the body's available stores of cystine, cysteine, and other sulfates necessary to detoxify cyanide are rapidly depleted in laetrile poisoning.

Cancer treatment

Amygdalin was first isolated in 1830. In 1845 it was used as a cancer treatment in Russia, and in the 1920s in the United States, but it was considered too poisonous. In the 1950s, a purportedly non-toxic, synthetic form was patented for use as a meat preservative, and later marketed as laetrile for cancer treatment.

The U.S. Food and Drug Administration prohibited the interstate shipment of amygdalin and laetrile in 1977. Thereafter, 27 U.S. states legalized the use of amygdalin within those states.

Initial studies at Sloan-Kettering

In 1972, Memorial Sloan-Kettering Cancer Center (MSKCC) board member Benno C. Schmidt, Sr. convinced the hospital to test laetrile so that he could assure others of its ineffectiveness "with some conviction." Kanematsu Sugiura, the scientist who performed the requested tests, found that laetrile inhibited secondary tumors in mice, though it did not destroy the primary tumors. He repeated the experiment several times with the same results. However, three other researchers were unable to confirm Sugiura's results. While these uncontrolled and inconclusive results were considered too preliminary to publish, they were leaked to laetrile advocates, resulting in significant public attention.

To expand on Sugiura's results, MSKCC researchers conducted a controlled experiment in which they injected some mice with laetrile (as Sugiura had done) and others with placebo. Sugiura, who was unaware of which mice had received laetrile, performed the pathologic analysis. In this controlled, blinded follow-up of Sugiura's initial uncontrolled experiment, laetrile showed no more activity than placebo.

Subsequently, laetrile was tested on 14 tumor systems without evidence of effectiveness. Given this collection of results, MSKCC concluded that "laetrile showed no beneficial effects." Mistakes in the MSKCC press release were highlighted by a group of laetrile proponents led by Ralph Moss, former public affairs official of MSKCC who was fired following his appearance at a press conference accusing the hospital of covering up the benefits of laetrile. These mistakes were considered scientifically inconsequential, but Nicholas Wade in Science stated that "even the appearance of a departure from strict objectivity is unfortunate." The results from these studies were published all together.

Subsequent clinical studies

A 2006 systematic review by the Cochrane Collaboration concluded: "The claim that laetrile has beneficial effects for cancer patients is not supported by data from controlled clinical trials. This systematic review has clearly identified the need for randomised or controlled clinical trials assessing the effectiveness of [l]aetrile or amygdalin for cancer treatment." Given the lack of evidence, laetrile has not been approved by the U.S. Food and Drug Administration.

The U.S. National Institutes of Health evaluated the evidence separately and concluded that clinical trials of amgydalin showed little or no effect against cancer. For example, a 1982 trial of 175 patients found that tumor size had increased in all but one patient. The authors reported that "the hazards of amygdalin therapy were evidenced in several patients by symptoms of cyanide toxicity or by blood cyanide levels approaching the lethal range."

The study concluded "Patients exposed to this agent should be instructed about the danger of cyanide poisoning, and their blood cyanide levels should be carefully monitored. Amygdalin (Laetrile) is a toxic drug that is not effective as a cancer treatment".

Advocacy and legality

Although laetrile is widely considered quackery in the medical community, advocates for laetrile dispute this label, asserting that there is a conspiracy between the U.S. Food and Drug Administration, the pharmaceutical industry and the medical community, including the American Medical Association and the American Cancer Society, to exploit the American people, and especially cancer patients. Some North American cancer patients have traveled to Mexico for treatment with the substance, allegedly under the auspices of Dr. Ernesto Contreras. One of these patients was actor Steve McQueen, who died in Mexico following cancer treatment with laetrile and surgery to remove a stomach tumour while undergoing treatment for mesothelioma.

Laetrile advocates in the United States include Dean Burk (now deceased), a former chief chemist of the National Cancer Institute cytochemistry laboratory, and national arm wrestling champion Jason Vale, who claimed that his kidney and pancreatic cancers were cured by eating apricot seeds. Vale was convicted in 2003 for, among other things, marketing laetrile. The court also found that Vale, who had made at least $500,000 from his illegal sales of laetrile, had fraudulently marketed the substance.

The US Food and Drug Administration continues to seek jail sentences for vendors marketing laetrile for cancer treatment, calling it a "highly toxic product that has not shown any effect on treating cancer."

http://en.wikipedia.org/wiki/Amygdalin