evidence: Despite the lack of evidence for the effectiveness of so-called alternative cancer treatments, these still continue to be used by patients desperate for a cure. Amygdalin and its synthetic counterpart laetrile are examples of alternative cancer treatments promoted online. However, overwhelming evidence from almost a century of research indicates that both are ineffective against cancer and can instead cause cyanide poisoning. Rather than prolonging life, research shows that switching from conventional cancer treatments to alternative treatments actually reduces the patient’s odds of survival.