This is a disclosure finding, not a safety finding. "Natural flavor" is a legally defined labeling category under 21 CFR 101.22, not a single substance.
The regulation permits a manufacturer to declare a blend of many individual flavoring constituents collectively under this single term without naming the component substances on the label. A consumer therefore cannot determine from the label what specific substances are present. No claim of harm is made or implied: the components may be entirely benign, and it is not possible to evaluate them from public labeling precisely because they are not disclosed. Two exceptions exist where disclosure IS required: major allergens under FALCPA must be declared separately even when used within a flavor, and FDA guidance (2023) requires sesame to be named specifically.