system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What does it mean when a smoothie or other food product lists "natural flavors" on the ingredients list?
gpt
In the United States, "natural flavor" means that, to provide a flavor, a concentrated extract of the usual ingredient has been added. Let's say you've got strawberry candy--instead of adding strawberry, you can add an extract of some of the chemicals in strawberries that provide the characteristic flavor; that's a "natural flavor." The label "other natural flavor" means that the flavor added is not just from the thing the product is labelled as--in addition to strawberry extract, you'd be adding another natural extract (not from strawberry) that enhances or simulates the strawberry flavor.

These terms are regulated by the Food and Drug Administration. Note that the term "natural" here only indicates the ingredient was derived from a natural source, rather than being synthesized.