Traditional ginger ale is made from a microbial starter culture (yeast or ginger bug), sugar, fresh ginger root, other flavourings and water. Ginger bug can be derived from ginger beer plant containing Saccharomyces florentinus and Lactobacillus hilgardii or fresh ginger root containing Lactobacillus bacteria and wild yeast. The carbonation comes from the yeast fermentation as opposed to carbonating the finished product.