How Natural Flavors Are Made: Extraction, Fermentation, and the FDA's Definition

That little phrase "natural flavors" on a snack label sounds like someone crushed a strawberry and called it a day. The reality is more interesting. Under U.S. Food and Drug Administration rules, a natural flavor is any flavoring derived from a plant or animal source and produced using processes like heating, extraction, and fermentation — the same kinds of processes commonly used to make everyday foods. The "natural" label is about where the flavor came from and how it was obtained, not about simplicity, purity, or health. Here is the science behind what's actually in the bag.

Understanding 'Natural Flavor': The FDA's Definition

The Flavor Extract Manufacturers Association, the industry body that evaluates the safe use of flavorings, summarizes the regulator's position plainly: the FDA "defines a natural flavor as a flavor that is derived from a natural source such as strawberries, and is produced using processes such as heating, extraction, and fermentation that are commonly used to produce foods." In other words, the definition has two moving parts — a natural origin and an approved process.

The regulatory home for this distinction is 21 CFR 101.22, where the FDA separates natural flavors from artificial flavors, which are produced through chemical synthesis. A natural flavor is a flavoring derived from a plant or animal source — a spice, fruit, herb, vegetable, edible yeast, or dairy product — whose primary job in food is taste rather than nutrition. That last clause matters: a natural flavor is defined by function, not by nutritional virtue.

One practical consequence for shoppers: the FDA does not require food labels to spell out what is inside a "natural flavor" unless the ingredients include a common allergen such as milk, egg, fish, shellfish, tree nuts, wheat, peanuts, or soy. Beyond allergen triggers, the label can stay a black box.

Scientific Methods for Creating Natural Flavors: Extraction and Distillation

The first family of techniques is physical. Solvent extraction is exactly what it sounds like: a solvent, often water or ethanol, dissolves and pulls flavor compounds out of the source material. Related methods include maceration, percolation, and infusion, which all involve soaking plant material in a solvent so flavor compounds break free from the plant.

Distillation works on a different principle — separation by boiling point. In steam distillation, a typical process for essential oils, steam is directed through plant material, the resulting vapor is collected and condensed, and the oil is separated from the water layer. What remains is the essential oil itself, which is classified as a natural flavor. Peppermint oil is a classic example: potent, concentrated, and entirely legitimate under the definition.

After extraction, the resulting concentrate is purified and blended to create a consistent, powerful flavor that can be used in food products. That blending step is where a trained professional — the flavorist — earns their keep, balancing top notes, body, sweetness perception, mouthfeel, and aftertaste from multiple natural ingredients.

Primary scientific methods for creating natural flavors
Processing Method	Scientific Principle	Example Source Material	Resulting Flavor Type
Solvent extraction (incl. maceration, percolation, infusion)	A solvent dissolves and pulls flavor compounds out of plant or animal material	Plant material soaked in water or ethanol	Flavor extracts and concentrates
Distillation (incl. steam distillation)	Liquids are separated based on their boiling points; vapor is condensed and the oil layer collected	Plant material such as peppermint	Potent essential oils, classified as natural flavors
Fermentation	Microorganisms like yeast transform a substance and create new, complex flavor compounds	Source material metabolized by microorganisms	Complex flavor compounds recognized by the FDA as natural
Enzymatic processes	Specific enzymes drive reactions that develop or alter flavor compounds	Natural source material	Flavor compounds produced under FDA-approved methods
Heating / roasting	Heat develops or alters the flavor profile of a natural source	Natural foods such as nuts or grains	Developed, cooked-type flavor notes

Natural vs. Artificial Flavors: Source, Not Structure

Here is the part that surprises most people: the natural/artificial divide is about origin, not molecular identity. Consider vanillin, the chemical that gives vanilla its classic, creamy flavor. It can be extracted from a vanilla bean — making it a "natural flavor" — or created synthetically — making it an "artificial flavor." As one flavor guide puts it, "Your taste buds can't tell the difference because, chemically, they're identical."

Artificial flavors are built from the ground up: flavor chemists use synthetic materials, which can include petroleum-derived inputs, to construct molecules that are exact chemical copies of ones found in nature. Natural flavors, by contrast, start with the actual plant or animal and use the extraction, distillation, and fermentation methods described above to isolate the same compounds.

Both categories are made by scientists, and natural flavors may even contain more chemicals than their artificial counterparts, since a natural extract is a mixture rather than a single purified molecule. Neither label is a health claim, and neither is automatically "better."

There is also an environmental trade-off worth knowing. The massive global demand for real vanilla has been linked to deforestation where the orchids grow, and cultivating acres of citrus for essential oils takes enormous amounts of water and land. Artificial flavors often start with non-renewable resources like petroleum, which carries its own baggage from drilling and chemical processing — but lab synthesis can sometimes use far less water and land than farming. The choice is not a simple case of good versus bad.