Vitamin B17 is also known as laetrile or amygdalin. It used to be used as a treatment for cancer but was banned in the US by the FDA in the mid-1980s because it was found not to be all that effective in treating cancer.
One article (1) looked at vitamin B17 and its ability to treat or prevent cancer. It was noted that some alternative medical clinics are using vitamin B17 as a way to prevent cancer. The claims that it can prevent cancer have been largely anecdotal and there haven’t been any good research studies indicating that it is effective against cancer.
It also noted that vitamin B17 boosts the immune system and that it acts against cancer cells by acting along with antioxidants, which scavenge for oxygen free radicals that can ultimately cause cancer by damaging the DNA of cells. It noted that the anti-cancer benefits of vitamin B17 have been studied with mixed results. As it is banned in the US, those patients who want to take it to prevent or treat cancer must go overseas to obtain the drug.
Source: 1.Vitamin B17 Controversy: Poison or Cancer Treatment? https://draxe.com/vitamin-b17/. Accessed 8/4/16.
Dr. Adem Gunes