Yes, it's well-known that you can't make a horse drink if he or she doesn't want to, and apparently you can't get a man to stop taking a dangerous supplement — say one that produces cyanide when ingested — even when you tell him that it does so. It's kind of hard to believe, but that's what was reported in BMJ Case Reports.

The Australian man, 67 years old (surely old enough to know better) visited a hospital for a routine procedure — a cystoscopy — requiring general anesthesia. While he...

Apricot seeds are all over the internet - marketed as cancer fighters. But the seeds contain a chemical compound that, when ingested in high quantities (and by high we mean several seeds), can cause cyanide poisoning.