"The trouble is most people don't consider it a medication because you don't need a prescription for it" Jamshidi told Business Insider.
Over the past two decades, US poison-control centres have gotten about 275,000 reports - roughly one every 24 minutes - of people who reacted badly to supplements; a third of them were about herbal remedies like St. John's wort.
The FDA defines supplements as products "intended to add further nutritional value to (supplement) the diet". They aren't regulated as drugs - only when a supplement is shown to cause significant harm is it called out as unsafe.
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