“Natural flavors” is one of the most common and least informative ingredients on food labels. By FDA definition, it refers to flavoring substances extracted from plant or animal sources, including fruits, vegetables, herbs, bark, dairy, meat, seafood, eggs, and yeast. The key distinction from artificial flavors is simply where the flavor chemicals originate, not how they’re processed or what the final product looks like chemically.
The FDA’s Legal Definition
Under federal regulation (21 CFR 101.22), a natural flavor is any essential oil, essence, extract, distillate, or product of roasting, heating, or enzyme breakdown that comes from a natural source and whose primary purpose in the food is flavoring rather than nutrition. The list of allowed sources is broad: spices, fruits, fruit juices, vegetables, vegetable juices, edible yeast, herbs, bark, buds, roots, leaves, meat, seafood, poultry, eggs, dairy, and fermentation products.
That’s a wide net. A “natural flavor” in your sparkling water could come from lemon peel oil. A natural flavor in your barbecue chips could come from chicken fat. The label doesn’t have to specify which source, and manufacturers rarely volunteer the information.
How Natural Flavors Are Made
The word “natural” refers to the starting material, not the production process. Once a manufacturer has a natural source like a fruit or herb, they can use industrial techniques to extract, concentrate, and isolate specific flavor compounds. Common methods include steam distillation, solvent extraction, supercritical carbon dioxide extraction, and enzyme-assisted processing. Enzymes can be used as a pretreatment to break down plant cell walls before the actual flavor compounds are pulled out through distillation or solvents.
The result is often a single isolated molecule or a carefully engineered blend of molecules, not a crushed-up strawberry or a squeeze of lemon. A vanilla-flavored product listing “natural flavors” might contain vanillin extracted from real vanilla beans, or it might contain vanillin derived from other plant materials through enzymatic or fermentation processes. Both count as natural under the FDA’s rules.
Natural and Artificial Flavors Are Often Identical
This is the part that surprises most people. In many cases, natural and artificial versions of the same flavor are chemically identical molecules. The only difference is the source. Flavor scientist Arielle Johnson, author of “Flavorama,” puts it plainly: your body can’t tell if something is a natural or artificial flavor. There’s no unique chemical signal for “artificial.” Chemically processed wood pulp, for example, can produce flavor molecules identical to those found in real vanilla.
The distinction matters for labeling and marketing, but it doesn’t reliably indicate a difference in safety, taste, or nutritional value. A natural flavor isn’t inherently healthier or purer than an artificial one.
What Else Is Hiding in the Mixture
A natural flavor listed on a label is rarely just the flavor compound itself. According to the Environmental Working Group, solvents, emulsifiers, flavor modifiers, and preservatives often make up 80 to 90 percent of a natural flavor mixture. These additional chemicals are classified as “incidental additives,” which means manufacturers are not required to disclose them on the label.
Some of these incidental additives are themselves natural, like ethanol used as a solvent. But the FDA also permits synthetic solvents such as propylene glycol in natural flavor mixtures. So a product’s ingredient list might simply say “natural flavors” while the actual mixture contains several undisclosed synthetic carrier chemicals. This is one of the biggest gaps in food labeling transparency.
Allergen Protections Still Apply
If you have food allergies, there’s one important safeguard. The Food Allergen Labeling and Consumer Protection Act (FALCPA) requires that major food allergens be disclosed on the label even when they’re part of a flavoring, coloring, or incidental additive. The law was specifically written to close the loophole where allergens could hide inside vague ingredient categories like “spices” or “natural flavors.” So if a natural flavor contains milk protein, soy, wheat, peanuts, tree nuts, eggs, fish, or shellfish, that allergen must appear on the label.
For less common allergens that fall outside the major eight (now nine, with sesame added), the protections are weaker and depend on FDA rulemaking. If you have a sensitivity to something outside that list, the label may not help you.
Organic Products Have Stricter Rules
Products labeled “organic” or “made with organic” ingredients face tighter restrictions on natural flavors. Under USDA National Organic Program rules, natural flavors in organic foods must be produced without synthetic solvents, synthetic carrier systems, or artificial preservatives. A long list of additives commonly found in conventional natural flavor mixtures are specifically banned in organic products, including propylene glycol, polysorbate 80, BHT, and BHA.
There’s an additional catch: organic products are supposed to use organic-sourced flavors when commercially available. Nonsynthetic natural flavors are only permitted when organic versions can’t be obtained. This makes the “organic” label one of the few tools consumers have for getting a somewhat cleaner version of natural flavors.
Vegan and Vegetarian Concerns
Because the FDA definition of natural flavors includes meat, seafood, poultry, eggs, and dairy, there’s no way to tell from the label alone whether a natural flavor is plant-derived or animal-derived. A growing number of companies voluntarily specify the source of their natural flavors on the label, but they aren’t legally required to do so.
The Vegetarian Resource Group notes that the only reliable way to confirm a natural flavor’s origin is to contact the manufacturer directly. This is becoming more complicated with the rise of precision fermentation, a process where microorganisms are programmed with animal genes to produce specific flavor compounds. These flavors may be marketed as “animal-free” even though they were developed from animal DNA. If this distinction matters to you, asking the company is your only real option.
What About Castoreum?
You may have seen viral claims that vanilla or raspberry flavoring comes from castoreum, a substance derived from beaver glands. Castoreum extract is indeed FDA-approved as a food ingredient and has been used in flavoring for over 80 years with no reported adverse reactions in humans. But its actual use in food today is negligible. It’s expensive and difficult to obtain in commercial quantities, so it shows up almost exclusively in high-end perfumery. The chances of encountering it in your grocery store vanilla ice cream are essentially zero.