Chances are, you’ve seen boxes of the flu remedy with the unpronounceable name (Oscillococcinum) propped up by the pharmacy register during cold and flu season. Or maybe you’ve rubbed arnica gel into a bump or bruise your child brought home from the playground. If so, you’ve dabbled in the world of homeopathy, microdosed natural remedies that work on the principle of “like cures like,” or the law of similars. Confused yet? Exactly how homeopathy works retains an air of mystery, yet the alternative-healing modality is widely used around the world (especially in Europe and India), has a small but growing body of scientific evidence that backs up its effectiveness, and is gaining in popularity in the United States (with sales growing more than 10 percent a year, on average, since 2000, according to Nutrition Business Journal).