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"Vitamin B17" is not a B vitamin (because none of its components act as coenzymes). Chemically, it is a compound of two sugar molecules, benzaldehyde and cyanide, called amygdalin; They're also called Nitrilosides; Derived from almonds; Amygdalin is not present in brewer's yeast; Most states in the United States do not recognize it as a cancer drug (25 do). The American Cancer Society is warning patients who are listening to rumors on the Internet that decades of clinical studies have shown that the compound has no evidence to support cancer. Taking this "supplement" can only increase the risk of cyanide poisoning and even death. Amygdaloside substances are not toxic by themselves, but when they are metabolized by β-glucosidase, they produce toxic hydrocyanic acid.
Experiments show that amygdalin is chemically inactive and has little effect on healthy tissues, only invading and destroying cancer cells. The active ingredient in amygdalin, a naturally occurring cyanide, is a human metabolite that can only function in cancer cells. In healthy liver, kidney, spleen, and leukocytes, the presence of β-glucosidase acts on amygdalin to produce cyanide and benzaldehyde, which synergistically enhance toxicity. Highly toxic. Some people think it can control and prevent cancer.