Sweet, delicious, stomach soothing, mood lifting and great for allergies too – licorice roots are all that and much more. Studies suggest that glycyrrhizic acid, an important active ingredient in licorice root, may provide significant anti-allergic activity. Not only it may help with allergic rhinitis, but other allergic reactions too. But use it sparingly, licorice is one of herbal ingredients that should be taken only in small doses.