Natural Flavor

The definition comes from US regulation — 21 CFR 101.22 — and it is a statement about where something came from, not about how processed, pure or healthy it is. A natural flavor can be made by distilling, extracting, fermenting or heating, and it can contain dozens of components.

Two things catch people out.

It does not mean it came from the fruit on the front of the pack. A natural strawberry flavor has to be built from natural sources. Those sources do not have to be strawberry. If real strawberry is in there and giving the flavor its character, the label changes — see natural WONF.

It does not mean simple or minimally processed. The solvents, carriers and processing aids sit outside the "flavoring components" and are covered by different rules.

What actually differs from artificial

Cost, availability and how well it holds up.

Natural raw materials cost more, depend on harvests and weather, and many of them are less stable in heat and acid than the synthetic equivalents. A natural citrus flavor in a hot-filled drink is a genuinely harder job than an artificial one — not a more expensive version of the same job.

If a label claim is driving the decision, settle it early. Switching from artificial to natural late in development usually means redoing the dosage, the stability testing, and sometimes the whole flavor.