Six supplements may be doing more harm than good. According to Consumer Reports, aconite, bitter orange, and yohimbe are considered the most dangerous.
Aconite is used for inflammation. It can cause low blood pressure, stop breathing, and it can cause heart rhythm problems.
Bitter orange is used for weight loss. It can result in heart attacks or stroke.
Yohimbe is used for body building or depression and can cause rapid heart rate.
Consumer Reports adds, more dangerous supplements include: colloidal silver, it can turn your skin permanently blue; greater celandine, it's used for upset stomachs but can cause liver damage; kava can also cause liver damage, it's banned in several countries.
You'll find more information on supplements here: http://www.consumerreports.org/cro/magazine-archive/2010/september/health/dietary-supplements/overview/index.htm