Wormwood is sometimes recommended today for the treatment of digestive conditions such as intestinal parasites, dyspepsia , esophageal reflux , and irritable bowel syndrome . However, there is no meaningful evidence to indicate that it is effective for any of these conditions. Only double-blind , placebo-controlled studies can show a treatment effective, and only one has been performed using wormwood. (For information on why such studies are essential, see Why Does This Database Rely on Double-blind Studies? )