[quote] While no standard recipe exists, the primary ingredients in modern root beer are filtered water, sugar, and artificial sassafras flavoring, which complements other flavors. Common flavorings are vanilla, wintergreen, black cherry bark, licorice root, sarsaparilla root, nutmeg, acacia, anise, molasses, cinnamon, sweet birch, and honey. Soybean protein is sometimes used to create a foamy quality, and caramel coloring is used to make the beverage brown.
[quote] Ingredients in early and traditional root beers include allspice, birch bark, coriander, juniper, ginger, wintergreen, hops, burdock root, dandelion root, spikenard, pipsissewa, guaiacum chips, sarsaparilla, spicewood, wild cherry bark, yellow dock, prickly ash bark, sassafras root, vanilla beans, dog grass, molasses and licorice. Many of these ingredients are still used in traditional and commercially produced root beer today, which is often thickened, foamed or carbonated. Although most mainstream brands are caffeine-free, Barq's does contain caffeine.