The exact definition of natural flavorings & flavors from Title
21, Section 101, part 22 of the Code of Federal Regulations is
"The term natural flavor or natural flavoring means the essential
oil, oleoresin, essence or extractive, protein hydrolysate, distillate,
or any product of roasting, heating or enzymolysis, which contains
the flavoring constituents derived from a spice, fruit or fruit
juice, vegetable or vegetable juice, edible yeast, herb, bark,
bud, root, leaf or similar plant material, meat, seafood, poultry,
eggs, dairy products, or fermentation products thereof, whose
significant function in food is flavoring rather than nutritional."
In other words, natural flavors can be pretty much anything approved
for use in food.