10. Yohimbe

This herbal supplement is sometimes used as an aphrodisiac, and also for chest pain, diabetic complications, depression, and erectile dysfunction. It is also known by the names yohimbine, Corynanthe yohimbi, and Corynanthe johimbi. Although it may actually be effective as a treatment for some of these conditions, it can also be dangerous, even when used in “normal” doses. High blood pressure and rapid heart rate may result, and in higher doses, things can swing drastically in the other direction, and trigger severe low blood pressure, heart problems, and even death.