21 CFR 101.22: Natural vs Artificial Flavor

By Will Pemble · July 18, 2026 · 5 min read

Under 21 CFR 101.22 the difference is origin, not chemistry. What (a)(3), (i) and (j) each require, and why (j) is not about flavor at all.

TL;DR

Under 21 CFR 101.22, a natural flavor must be derived from a plant or animal source whose function in food is flavoring.
An artificial flavor is any flavoring substance not derived from those natural sources, even if the identical molecule also occurs in nature.
The distinction is about origin, not chemistry: whether a compound is natural or artificial depends on how it was made, not what it is.
The label wording, natural flavor, artificial flavor, or natural and artificial flavor, follows directly from the sources used.
A natural-only formulation excludes synthetic aroma chemicals and favors essential oils, extracts, and fermentation-derived materials.

The difference between a natural flavor and an artificial flavor is one of the most misunderstood ideas in food. It is not about chemistry, safety, or nutrition. Under the FDA's rules in 21 CFR 101.22, it is about origin: where the flavoring came from and how it was made.

A natural flavor is derived from a plant or animal source whose function in food is flavoring. An artificial flavor is a flavoring substance that is not. That is the whole distinction, and everything about labeling follows from it.

The legal definition

The regulation defines a natural flavor as, in the FDA's words, "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."

An artificial flavor is defined by exclusion: any substance whose function is to impart flavor and which is not derived from those natural sources. Read together, the two definitions draw a single line based on source, not molecule.

Origin, not chemistry

The consequence surprises people: a natural flavor and an artificial flavor can be the exact same molecule. Vanillin extracted from a vanilla bean or produced by fermentation is a natural flavor. The identical vanillin molecule made by chemical synthesis is an artificial flavor. Same compound, same taste, same safety profile, different label, because the regulation classifies by how the substance was produced.

This is why "natural" on a flavor label is a statement about sourcing and process, not a claim about health. Both natural and artificial flavors are held to the same food safety standards, whether through a FEMA GRAS determination by the Flavor and Extract Manufacturers Association or another regulatory route.

What the label must say

Because the classification is about source, the flavor declaration on a food label follows directly from the ingredients used:

If every flavoring in the product comes from natural sources, it is labeled "natural flavor."
If any flavoring is not from a natural source, the artificial portion triggers "artificial flavor."
If both are present, the declaration is "natural and artificial flavor."

The precise wording, order, and characterizing-flavor rules are all specified in 21 CFR 101.22. Getting them right is a labeling compliance task, not a marketing choice.

Reading 101.22 by subsection

Most people arrive at this regulation looking for one specific paragraph. Here is what each of the ones that get cited actually governs.

(a)(1) defines artificial flavor. Any substance whose function is to impart flavor and which is not derived from the natural sources listed in (a)(3). The definition works by exclusion, so a substance is artificial because of where it did not come from.

(a)(3) defines natural flavor. The essential oil, oleoresin, essence, extractive, protein hydrolysate, distillate, or product of roasting, heating or enzymolysis containing flavoring constituents from a listed source. Worth noting because it is a common misreading: animal sources count. Meat, seafood, poultry, eggs and dairy products are all named in the definition alongside plant material, so a flavor derived from them is a natural flavor.

(c) says where the statement goes. A declaration of artificial flavoring, artificial coloring or chemical preservative has to appear on the food, its container, or its wrapper, in whatever combination is needed to make it likely to be read.

(i) is the characterizing flavor rule, and it is the paragraph most labeling questions actually land on. If a food is presented as having a primary recognizable flavor, the name of that flavor has to appear next to the name of the food in letters at least half the height of the food name. Which words go with it depends on what is in the product:

(i)(1) covers a characterizing flavor with no artificial flavor simulating it. The food name is accompanied by the common name of the flavor, for example "vanilla".
(i)(1)(i) covers not having enough of the real thing. The flavor name may be preceded by "natural" and must be followed by "flavored", giving constructions like "natural vanilla flavored".
(i)(2) covers an artificial flavor that simulates the characterizing flavor. The flavor name must carry "artificial" or "artificially flavored".
(i)(3) extends all of this beyond the principal display panel. Wherever the flavor name appears conspicuously enough to be seen at purchase, outside the ingredient statement, the prescribed words have to immediately precede or follow it.

(j) is not about flavor. It governs chemical preservatives, requiring a food with an added chemical preservative to declare both the common name of the ingredient and a separate description of its function, such as "preservative", "to retard spoilage" or "a mold inhibitor". If you came looking for 101.22(j), that is the paragraph you want, and it sits in the same section as the flavor rules only because 101.22 covers spices, flavorings, colorings and chemical preservatives together.

What this means for formulation

For a flavorist, "make it natural" is a hard constraint that reshapes the whole palette. A natural-only formula can use essential oils, oleoresins, extracts, distillates, and fermentation-derived materials, but not synthetically produced aroma chemicals, even when a synthetic version of the identical molecule would be cheaper and more consistent.

Enforcing that by hand is error prone, because whether a given material qualifies as natural depends on its source and method of manufacture, not its name on a spec sheet. Ambrose's AI Flavor Formulator handles this directly: in natural-only mode it applies the 21 CFR 101.22 rules to the ingredient palette, excludes synthetic aroma chemicals, favors natural-source materials, and flags each component with a four-state natural check so the natural claim on the finished label is defensible.

Sources

Frequently Asked Questions

What is the legal definition of natural flavor?

Under 21 CFR 101.22, a natural flavor is a flavoring 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.

Is natural flavor healthier than artificial flavor?

Not inherently. The natural and artificial distinction is about the source of the flavoring, not its safety or nutrition. The same flavor molecule can be safe whether it is extracted from a plant or synthesized, and both natural and artificial flavors are subject to the same food safety requirements.

Can a natural flavor and an artificial flavor be the identical molecule?

Yes. A compound extracted from a natural source is a natural flavor, while the identical compound made by chemical synthesis is an artificial flavor. The regulation classifies by origin, so the same molecule can be labeled either way depending on how it was produced.

What must the label say?

The flavor declaration follows the sources used: 'natural flavor' when all flavoring is from natural sources, 'artificial flavor' when it is not, and 'natural and artificial flavor' when both are present, following the naming rules in 21 CFR 101.22.

How does a formulator keep a flavor natural?

By building the formula only from flavoring materials derived from permitted natural sources, such as essential oils, extracts, distillates, and fermentation products, and excluding synthetically produced aroma chemicals. Software can enforce this by filtering the ingredient palette to natural-compliant materials and flagging anything that is synthetic or unverified.

What does 21 CFR 101.22(j) cover?

Chemical preservatives, not flavor. Paragraph (j) requires a food containing an added chemical preservative to declare both the common or usual name of that ingredient and a separate description of its function, such as 'preservative', 'to retard spoilage' or 'a mold inhibitor'. It sits alongside the flavor rules because 21 CFR 101.22 covers spices, flavorings, colorings and chemical preservatives in one section.

What does 21 CFR 101.22(i) require?

Paragraph (i) is the characterizing flavor rule. If a food is presented as having a primary recognizable flavor, the name of that flavor must appear with the name of the food in letters at least half the height of the food name. Under (i)(1) a flavor with nothing artificial simulating it is named plainly, such as 'vanilla'. Under (i)(1)(i) a product without enough of the real thing uses 'natural' before and 'flavored' after. Under (i)(2) an artificial flavor simulating the characterizing flavor must carry 'artificial' or 'artificially flavored'. Under (i)(3) those words follow the flavor name anywhere it appears conspicuously outside the ingredient statement.

Will Pemble

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Last updated July 18, 2026