Horny Thunder Testosterone Goat Weed - Once reputed in early Asia as a natural aphrodisiac and cure for impotence, this extract contains high doses of icarin. Which may be toxic to the liver and kidneys. Korean Ginseng - Another herb unregulated by the FDA has been known to cause anxiety and rapid blood pressure. L-Arginine - Which is also found in male enhancement pills causes diarrhea and possibly gout. Not trying to scare you, but most of these have common side effects, so be prepared if you plan on taking them.