From Dr. Hale: St. John’s Wort is a weak SSRI. It also stimulates liver enzymes and may enhance the metabolism of other drugs. German varieties are found to be the most pure in independent testing; other brands may have contaminates and not be very pure. Documented drug-drug interactions have been found; the action of St. John’s Wort on the liver can accentuate the metabolism of many drugs. For example, St. John’s Wort may reduce the efficacy of birth control pill regimens, although this has not been documented.
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