Side Effects of Herbs and Supplements


These warning and precautions apply to ALL herbal substances used for medicinal purposes. The uses of herbs described on this website are based on tradition, scientific theories, or limited research. They have not been thoroughly tested in humans, and safety and effectiveness have not been proven and are not guaranteed. Some of these conditions are potentially serious, and should be evaluated by a qualified healthcare provider.

Note that the FDA has does not review herbs for safety or effectiveness.

Before Using Herbs for Medicine

Consult with your doctor before using herbal remedies if you use any medication or drugs including prescription and over-the-counter or non-prescription drugs.

Treating infants and children under 2 years old with any herbal preparation is hazardous.

During Treatment

Adverse reactions are possible with any herb. Seek emergency medical treatment for convulsions, blood in urine, decreased urine flow, swelling of hands and feet, or coma.

Surgery: If you are scheduling surgery, tell your doctor, dentist, or other medical professionals about any herbal treatments you are using.

Consult with your doctor if you use herbal remedies for any medical problem that doesn’t improve in 2 weeks.

After Treatment

Did your herbal remedy work? If so, share your experience with others. If it didn’t work then that is also important information to share. Use the form below to tell us about your favorite herb. Please note that all addresses are held confidential.

Return to the herb list.