Key Facts
- →'Natural flavor' is the 4th most common ingredient listed on U.S. food labels
- →A single 'natural flavor' entry can contain dozens of individual chemical compounds
- →Vegans cannot confirm whether a 'natural flavor' is plant-based without contacting the manufacturer
The FDA Definition
Under FDA regulations (21 CFR 101.22), 'natural flavor' means any substance derived from a 'natural' source — including plant, animal, seafood, dairy, or fermentation products. The original source must be natural, but the final compound can be heavily processed and chemically modified. A flavor house can blend dozens of individual chemical compounds into a single 'natural flavor' without disclosing any of them.
Castoreum — The Beaver Example
One of the most well-known natural flavors is castoreum — a secretion from the castor sacs (located near the anal glands) of beavers. It has been approved by the FDA as a natural flavor and has been used historically in vanilla and raspberry-flavored products. While its use has declined due to cost, it remains legally permissible and illustrates why 'natural' does not mean transparent or plant-derived.
Vegan & Allergen Risk
Because the source of a 'natural flavor' is not required to be disclosed on the ingredient label, vegans cannot verify whether a product is truly plant-based. Similarly, people with fish, shellfish, or dairy allergies cannot confirm whether a 'natural flavor' contains their allergen without contacting the manufacturer directly. Note: FALCPA requires labeling of the Big 9 allergens even in flavors, but only for those specific allergens.
The Transparency Deduction
Every use of 'Natural Flavor' on a label deducts 15 points from a product's Transparency Index on our scanner. This reflects the deliberate opacity of the ingredient — not necessarily safety, but the manufacturer's choice to hide specifics behind a catch-all term. A product can use natural flavor and still be healthy, but it cannot be considered fully transparent.