Tag Archives | St. John’s wort

AHA Warning: Some Supplements can Worsen Heart Failure

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Posted 11 August 2016

In a new scientific statement citing Natural Medicines, the American Heart Association (AHA) warns against the use of many supplements in people with heart failure. St. John’s wort, grapefruit juice, ginsenghawthorn, danshen, black cohosh, and green tea are among those discussed for their potential to cause significant interactions with commonly used heart failure medications. Other natural medicines, including aconitegossypol, licorice, and yohimbine are noted for their potential to cause harmful cardiovascular effects, including high blood pressure and decreased heart rate. Ephedra, a banned substance in the US, is also warned against as it raises blood pressure, can stimulate the heart, and make chest pain and irregular heartbeat worse.

For more details on specific drug interactions associated with these supplements, please review our scientific monographs on each product, or try our interaction checker.Read the rest

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New York Attorney General targets herbal marketers

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Posted 09 February 2015

New York Attorney General Eric T. Schneiderman has sent letters ordering GNC, Target, Walmart, and Walgreens to stop selling store-brand herbal products that could not be verified to contain the labeled substance(s), or which were found to contain ingredients not listed on their labels. The products included echinacea, ginseng, and St. John’s wort. The letters were sent because DNA tests performed as part of the Attorney General’s ongoing investigation found that only 21% of the products contained ingredients listed on their labels. Quackwatch has more details plus links to the warning letters. The investigation was triggered by a New York Times report about a Canadian study which found widespread discrepancies between the ingredients listed on the labels of 44 popular products and those found in the products.

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