Vitamin B 17 is not actually a vitamin at all but is the alternative name for the anti-cancer drug, laetrile. Laetrile is approved by some countries for the treatment of cancer but is banned in other countries because not everyone believes that it actually cures cancer.
The major source of vitamin B 17 is the apricot pit. The vitamin is extracted from the apricot pit and is purified to make an oral anti-cancer agent.
According to one article (1), some scientists are covering up the effectiveness of laetrile (vitamin B 17) in as an effective treatment for cancer. The author of the article indicates that more researchers should take up the cause of this drug to see whether or not it does cure cancer so that it can be used by cancer patients once it has been found to be effective.
Source: 1.Scott, D. Vitamin B17: The Greatest Cover-Up In The History Of Cancer. http://reset.me/story/vitamin-b-17-the-greatest-cover-up-in-the-history-of-cancer/. Accessed 7/10/16.
Dr. Adem Gunes