evidence: - "Vitamin B17" 1 tab TID. [...] There are several theories explaining how cyanide could specifically target cancer cells, while leaving non-cancer cells unharmed. It has been proposed that cancer cells exhibit higher beta-glucuronidase activity, thus making them more susceptible to the uptake and hydrolysis of amygdalin to cytotoxic cyanide (1). Another theory states that cancer develops as a result of specific vitamin deficiencies, and the addition of Vitamin B17 (Laetrile) can restore health to the body (1). Granted, these theories do have an experimental basis, however, the clinical evidence supporting the use of Laetrile as an anti-cancer agent is lacking. [...] There have been no randomized controlled trials or quasi-RCTs to evaluate the effectiveness or safety of laetrile. Production and distribution of Laetrile has been banned in the United States, as supported by distinct public statements from organizations including the American Cancer Society and National Cancer Institute (1,6). In the 1970s, the mainstream nature of the controversy was such that even "Doonesbury", a popular syndicated daily comic strip, made reference to the dangers of Laetrile and how its ongoing availability and marketing is nothing more than a "money grab" (7). Despite this, Laetrile continues to be available in Mexico, marketed in products such as Vitamin B17 to a contemporary market of vulnerable and desperate consumers.