Yohimbine (also known by the names of aphrodin, corynine, yohimvetol, or quebrachin) has been used for decades as both a natural remedy for erectile dysfunction and as an aphrodisiac. It is now being marketed as a weight loss supplement and as an ingredient in body building products.
High doses of Yohimbine have been linked to rapid heart rate, high blood pressure, respiratory problems, and anxiety attacks. Cases of renal failure and seizures have recently turned up and are under investigation by the FDA. Serious adverse effects are likely when yohimbine is taken with OTC products containing phenylpropanolamine (common in nasal decongestants and diet pills). Paralysis and death are possible with high doses.
Chaparral
Chaparral is sold in the form of capsules, teas, and concentrated extracts. It has been heavily promoted as a cancer cure, an arthritis treatment, and a method to stop muscle spasms.
Chaparral is extremely toxic. Liver damage (including cases of acute non-viral hepatitis), cirrhosis, and kidney failure have been reported following use of chaparral. At least five cases of severe hepatotoxicity have resulted in liver transplants.
Germander (Teucrium chamaedrys)
Germander is often combined with other herbs and marketed as a weight loss product and obesity treatment. Profusely used in the past as a tonic for chronic conditions and inflammatory diseases, it is now considered unsafe but still recommended by alternative healers. Breathing problems and chest pains have been reported by users of germander. After almost 30 cases of acute nonviral hepatitis were reported in France, the French Ministry of Health banned all products containing this herb.
Lobelia
Lobelia, also known as Indian Tobacco, is often grown in window boxes because of its beautiful deep blue flowers. Native Americans used it to treat asthma and muscle disorders, to induce vomiting and as a purgative. However, as little as a teaspoon of lobelia in dried form can cause irregular heartbeat and breathing difficulties. Higher doses are lethal.