Adverse effects from the use of dietary supplements should be reported to MedWatch: You, your health care provider, or anyone may report a serious adverse event or illness directly to FDA if you believe it is related to the use of any dietary supplement product, by calling FDA at 1-800-FDA-1088, by fax at 1-800-FDA-0178 or reporting on-line at: MedWatch
Chaparral (a traditional American Indian medicine) - Liver disease, possibly irreversible
Comfrey - Obstruction of blood flow to liver, possibly leading to death
Slimming/dieter's teas - nausea, diarrhea, vomiting, stomach cramps, chronic constipation, fainting, possibly death.
Ephedra (also known as Ma huang, Chinese Ephedra and epitonin) - Ranges from high blood pressure, irregular heartbeat, nerve damage, injury, insomnia, tremors, and headaches to seizures, heart attack, stroke, and death.
Lobelia (also known as Indian tobacco) - Liver disease, possibly leading to death.
Germander - Range from breathing problems at low doses to sweating, rapid heartbeat, low blood pressure, and possibly coma and death at higher doses.
Magnolia-Stephania preparation - Kidney disease, possibly leading to permanent kidney failure.
Willow bark - Reye syndrome, a potentially fatal disease associated with aspirin intake in children with chickenpox or flu symptoms; allergic reaction in adults. (Willow bark is marketed as an aspirin-free product, although it actually contains an ingredient that converts to the same active ingredient in aspirin.)
Wormwood - Neurological symptoms, characterized by numbness of legs and arms, loss of intellect, delirium, and paralysis.
Vitamin A (in doses of 25,000 or more International Units a day) - Birth defects, bone abnormalities, and severe liver disease.
Vitamin B6 (in doses above 100 milligrams a day) - Balance difficulties, nerve injury causing changes in touch sensation.
Niacin (in slow-released doses of 500 mg or more a day or immediate-release doses of 750 mg or more a day) - Range from stomach pain, vomiting, bloating, nausea, cramping, and diarrhea to liver disease, muscle disease, eye damage, and heart injury.
Selenium (in doses of about 800 micrograms to 1,000 mcg a day) - Tissue damage.
Germanium (a nonessential mineral) - Kidney damage, possibly death.
L-tryptophan (an amino acid) - Eosinophilia myalgia syndrome, a potentially fatal blood disorder that can cause high fever, muscle and joint pain, weakness, skin rash, and swelling of the arms and legs. (source: FDA Consumer magazine (September-October 1998))