Marketed as an aid to improve mood, Saint John’s wort can reduce the effectiveness of a variety of prescription medications, including anticoagulants and antidepressants. It also can decrease the effectiveness of cancer drugs by up to 40 percent. — Photo by Reneé Comet
En español | Even “natural” supplements can interact with prescription medications, especially if you have hypertension, diabetes, kidney disease or liver problems. Consult your doctor about any supplements you take.