"So why the concern over natural flavors anyway. Because they're not natural. The more natural a food claims to be, the less it usually is. A truly natural food, rarely calls itself "natural," it just calls itself "lemon" or "cinnamon." Moreover, the chemical called "flavor" is virtually identical whether natural or artificial. Banana flavor for example is created by distilling the flavor molecules from a banana using a chemical solvent, while artificial banana flavor is created by mixing chemicals, that result is the identical chemical output."
Link to full article: http://www.huffingtonpost.com/the-sweet-beet/natural-herbal-tea_b_836251.html