Are there any risks in taking the supplement St. John’s wort?

St. John's wort is widely known as an herbal medicine for treating depression but, as with other supplements, it can have side effects. The most common reported are gastrointestinal symptoms, dizziness, confusion, tiredness and sedation. It should not be taken by women on contraceptive medication because of problems that can be caused in the liver. Those diagnosed with schizophrenia should avoid taking St. John's wort since it has been found to cause psychosis in these patients. St. John's wort interferes with birth control pills by decreasing their effectiveness. It also does that with cyclosporin used to prevent rejection of transplants. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.