Dutch authorities highlight St. John s wort supplements and tea effects on drug action Dutch authorities are advising consumers to exercise caution when consuming dietary supplements and tea containing St. John s wort, owing to adverse effects observed in combination with medicines.
Advice issued by The National Institute for Public Health and the Environment (RIVM) identifies the reduced effect of chemotherapy or agents against fungal or viral infections as one possible side effect.
Other outcomes observed when consuming herbal preparations or remedies containing St. John s wort include an enhanced effect of antidepressants or sedatives.
“There are indications for genotoxicity and reproductive and developmental toxicity,” RIVM’s
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