Ingredient List Order Rules (21 CFR 101.4)
Descending order of predominance by weight, under each ingredient's common or usual name. The sub-ingredient parentheses, the 2 percent or less provision in its exact wording, and the collective names you may and may not use.
An FDA ingredient statement is a sorted list, and the ingredient list order rules in 21 CFR 101.4 are what sorts it: ingredients are declared by their common or usual name in descending order of predominance by weight. Nearly every defect a reviewer finds is a failure of that one sentence, whether a name that is too general, a compound ingredient never broken out, or a minor ingredient parked where the order does not allow.
The section is short, but it hands off in four directions: to the rest of the FDA labeling rules for placement, to 101.22 for spices, flavors and colors, to 101.100 for what you may leave off, and to the statute for allergens. For the whole label rather than this line, start with FDA food labeling requirements.
The ingredient list order rules in 101.4(a)(1)
Ingredients required to be declared, including in foods that comply with standards of identity, except those exempted by 101.100, shall be listed by common or usual name in descending order of predominance by weight, on either the principal display panel or the information panel in accordance with 101.2. Supplement ingredients already listed in the nutrition label under 101.36 need not be repeated; 101.4(g) covers supplement statements separately.
Order is set by weight and nothing else. Tomato puree at 620 g leads the batch above because 620 is the largest number in the formula, and water at 150 g sits second even though nobody markets a sauce on its water content.
The section never defines the moment you weigh. Its only timing rule is paragraph (c): when water reconstitutes an ingredient that paragraph (b) lets you declare by a class name, that name is positioned by the unreconstituted weight plus the water needed to reach single strength, and any water beyond single strength is declared separately as "water". That only makes sense if you order by what went into the batch, so order from the kettle, not from a finished-product analysis. Placement then follows 101.2, covered in the questions below.
Common or usual name, and the names 101.4 spells out
Paragraph (b) starts from a default: the name of an ingredient shall be a specific name and not a collective or generic name. Many of its exceptions are simply permissions to use a shorter dairy or egg name.
| Cite | Forms covered | May be declared as |
|---|---|---|
| 101.4(b)(3) | Skim milk, concentrated skim milk, reconstituted skim milk, nonfat dry milk | "skim milk" or "nonfat milk" |
| 101.4(b)(4) | Milk, concentrated milk, reconstituted milk, dry whole milk | "milk" |
| 101.4(b)(5) | Bacterial cultures | "cultured" plus the substrate, e.g. "cultured skim milk" |
| 101.4(b)(6) to (b)(9) | Sweetcream buttermilk forms; whey forms; cream and plastic cream; butteroil and anhydrous butterfat | "buttermilk", "whey", "cream", "butterfat" |
| 101.4(b)(10) to (b)(12) | Dried, frozen and liquid whole eggs, whites and yolks | "eggs", "egg whites", "egg yolks" |
| 101.4(b)(20) | Sucrose from cane or beet | "sugar" refers to sucrose and nothing else |
That last row is worth sitting with: for ingredient labeling the word sugar means sucrose, and dextrose, fructose, honey and fruit juice concentrate all carry their own names.
Fats and oils get their own paragraph, 101.4(b)(14). Each is declared by its specific name, such as "beef fat" or "cottonseed oil", in its order of predominance. A blend may be declared as a shortening or a blend of oils, the blank filled with "vegetable", "animal" or "marine", if the individual oils follow in parentheses: "vegetable oil shortening (soybean and cottonseed oil)". Descending order inside those parentheses is required when the combined weight of all fat and oil ingredients equals or exceeds the most predominant non-fat ingredient. Hydrogenation must show in the name.
Two further rules catch producers out. Under 101.4(b)(15), when all the ingredients of a wheat flour are declared, the first is named by its standard term: "flour", "white flour", "wheat flour" or "plain flour"; "whole wheat flour", "graham flour" or "entire wheat flour"; or "durum flour". Under 101.4(d), a "nondairy" food containing a caseinate must follow it with a parenthetical naming the source, such as sodium caseinate (a milk derivative).
Sub-ingredients: when parentheses are required, and the two permitted ways
This is 101.4(b)(2), what producers most often get wrong after buying a prepared component. It applies when an ingredient itself contains two or more ingredients and one of three things is true: it has an established common or usual name; it conforms to a USDA standard under the Meat Inspection or Poultry Products Inspection Acts; or it conforms to a definition and standard of identity under section 401 of the Federal Food, Drug, and Cosmetic Act. It shall then be designated by either of two alternatives. Note the word: either. You choose the format, not whether to disclose.
Alternative (i), the parenthetical. Declare the established common or usual name, followed by a parenthetical listing of all the ingredients contained in it, in descending order of predominance. A bought-in mayonnaise becomes "Mayonnaise (Soybean Oil, Eggs, Distilled Vinegar, Salt)", positioned in the master list by the whole weight of the mayonnaise.
Alternative (ii), the dissolve. Drop the compound name and incorporate the common or usual name of every component into the main statement, each in descending order of predominance in the finished food. The mayonnaise disappears and its oil, eggs, vinegar and salt take the positions their own weights earn.
The two produce genuinely different labels. The dissolve can push a component several places up, and it merges a component appearing twice in your formula into one weight, which usually changes which three ingredients lead the statement.
The 2 percent or less provision, in its exact wording
Paragraph (a)(2) relaxes the order, not the duty to declare. The descending order requirements of (a)(1) do not apply to ingredients present in amounts of 2 percent or less by weight when a listing of those ingredients is placed at the end of the ingredient statement following an appropriate quantifying statement, for example "Contains __ percent or less of ______" or "Less than __ percent of ______." The blank is filled with a threshold level of 2 percent, or if desired 1.5 percent, 1.0 percent, or 0.5 percent. Then the sentence that catches people: no ingredient to which the quantifying phrase applies may be present in an amount greater than the stated threshold.
Against the worked batch that is a clean procedure. Two percent of the 1,000 g batch is 20 g, so anything at or below 20 g may join the tail group: dried basil at 18 g and salt at 12 g qualify, while tomato puree at 620 g, water at 150 g, onions at 120 g and olive oil at 80 g keep strict descending order at the head. Inside the group, salt may precede the heavier basil, because descending order is what the provision suspends.
- It is optional. Ordering all six strictly by weight is equally compliant.
- The group must be at the end. A quantifying statement with named ingredients after it does not satisfy (a)(2).
- Only four thresholds exist. 2 percent, 1.5 percent, 1.0 percent or 0.5 percent. There is no 3 percent group.
- The threshold must be true of every member. An 18 g ingredient in a 1,000 g batch is 1.8 percent, so "Contains 2 Percent or Less of" is accurate and "Less than 1 Percent of" is false.
- Nothing is omitted. Every ingredient in the group is still named in full.
Percentages elsewhere are governed by 101.4(e): a declared ingredient percentage goes in parentheses after the name, as percent by weight rounded to the nearest 1 percent, except that ingredients at 2 percent or less may be grouped using the same quantifying statement. Our ingredient statement formatter takes batch weights, applies the descending sort, finds the threshold break and writes the quantifying statement.
Collective names: where they are allowed and where they are not
Because paragraph (b) starts from specific names, every collective term on a US label has to trace to one of its numbered exceptions.
| Collective term | Cite | How it must be written |
|---|---|---|
| Spices, flavorings, colorings, chemical preservatives | 101.4(b)(1) | Declared according to the provisions of 101.22 |
| Leavening | 101.4(b)(16) | e.g. "leavening (baking soda, monocalcium phosphate, and calcium carbonate)" |
| Yeast nutrients | 101.4(b)(17) | e.g. "yeast nutrients (calcium sulfate and ammonium phosphate)" |
| Dough conditioners | 101.4(b)(18) | e.g. "dough conditioners (L-cysteine, ammonium sulfate)" |
| Firming agents | 101.4(b)(19) | Positioned by the total weight of all firming agents |
| Fish protein | 101.4(b)(23) | e.g. "fish protein (contains one or more of the following: Pollock, cod, and/or pacific whiting)" |
| Wax and resin on fresh produce | 101.4(b)(22) | Set phrases only, e.g. "coated with food-grade vegetable-, petroleum-, beeswax-, and/or shellac-based wax or resin" |
The four middle entries share one structure: individual agents in parentheses in descending order, except that a manufacturer unable to adhere to a constant pattern need not keep them in order, and agents only sometimes used may be flagged with "or", "and/or" or "contains one or more of the following:". Everything else keeps its specific name; 101.4 has no collective term for emulsifiers, stabilizers, gums, acidulants or sweeteners.
Colors are asked about most, and the detail is not in 101.4 at all: 101.4(b)(1) routes colorings to 101.22. The split there runs between color additives subject to FDA batch certification, which carry FD&C numbers and are declared by their individual names, and colors exempt from certification, which may be declared collectively. The certified colors used in US foods are FD&C Blue No. 1, Blue No. 2, Green No. 3, Red No. 3, Red No. 40, Yellow No. 5 and Yellow No. 6. Read the current text of 101.22 before settling wording.
Two dates matter to anyone reformulating. FDA's revocation of FD&C Red No. 3 for food use is final: foods must stop using it by 15 January 2027. Separately, on 22 April 2025 HHS and FDA announced a plan to eliminate FD&C Green 3, Red 40, Yellow 5, Yellow 6, Blue 1 and Blue 2 by the end of 2026, a voluntary target rather than a rule.
Incidental additives and the processing-aid exemption
The exemption 101.4(a)(1) points to is 101.100(a)(3): incidental additives present at insignificant levels that do not have any technical or functional effect in that food. Both halves must be true.
Three categories qualify. First, substances with no effect that arrived as an ingredient of another ingredient where they did have one: the anticaking agent in a purchased seasoning blend that does nothing in your sauce. Second, processing aids, split three ways: substances removed in some manner before the food is packaged in finished form; substances converted into constituents normally present that do not significantly increase the amount naturally found there; and substances added for a technical effect in processing but present in the finished food at insignificant levels with no effect in it. Third, substances migrating from equipment or packaging that are not food additives under section 201(s) of the act.
The functional-effect half decides most real cases: a release agent still keeping the finished product from sticking inside its wrapper has a function, so it is an ingredient and takes its place in the order.
Sulfites are carved out with a number. Under 101.100(a)(4), any sulfiting agent, meaning sulfur dioxide, sodium sulfite, sodium bisulfite, potassium bisulfite, sodium metabisulfite or potassium metabisulfite, added to a food or any of its ingredients and having no technical effect counts as insignificant only if no detectable amount is in the finished food. Detectable is 10 parts per million or more.
How allergens attach to the ingredient list
Nothing in 21 CFR 101.4 creates an allergen duty. That comes from the statute: the Food Allergen Labeling and Consumer Protection Act of 2004 wrote allergen disclosure into section 403(w) of the Federal Food, Drug, and Cosmetic Act, and the FASTER Act added sesame as the ninth major allergen effective 1 January 2023. FDA's allergen labeling questions and answers guidance, Edition 5, finalized 6 January 2025, is nonbinding guidance, not a rule.
Treat the two as independent. 101.4 and 101.100 decide whether an ingredient is named and where it sits; section 403(w) decides whether a major allergen food source is disclosed, either in parentheses beside the ingredient or in a separate "Contains" statement. Three interactions are worth checking on every label:
- The 2 percent group. Moving an ingredient into the tail changes its position, not its allergen status: soy lecithin there still requires a soy declaration.
- Collective names. "Spices", "natural flavor" and "leavening" can each carry a source that must be disclosed, and the collective term does not disclose it.
- The dissolve. Alternative (ii) removes a familiar compound name, so confirm the allergen sources are still visible afterwards.
The two disclosure routes, the sesame rules and what advisory "may contain" statements accomplish are covered in FALCPA and the FASTER Act. Once your list is sorted and grouped, run it through our allergen detector to catch any of the nine major allergens your ingredient names imply but your Contains statement never mentions.
Frequently asked questions
Does the 2 percent rule let me leave small ingredients off the label?
No. 101.4(a)(2) suspends the descending order requirement and does nothing else. Each ingredient is still declared by its common or usual name, in the group at the end, behind a quantifying statement. The only route to omitting an ingredient is an exemption in 101.100.
Can I just write "spices" instead of naming them?
101.4(b)(1) allows spices, flavorings, colorings and chemical preservatives to be declared according to 101.22 rather than by specific name, so a collective spice declaration has a basis, and the conditions and exact wording live in that separate section. The permission is narrow: it does not extend to emulsifiers, stabilizers, gums or sweeteners.
Is water an ingredient, and where does it go?
Water added to the formula is an ingredient and takes its place by weight, which is why water at 150 g sits second in the worked batch. The special case is 101.4(c), which positions a reconstituted class-name ingredient by its unreconstituted weight plus the water needed to reach single strength, with any water beyond that declared separately as "water".
Which threshold percentages may I use in the quantifying statement?
Four, and only four: 2 percent, 1.5 percent, 1.0 percent or 0.5 percent. No ingredient covered by the phrase may exceed the stated threshold, so the figure must be true of the heaviest member. An 18 g ingredient in a 1,000 g batch is 1.8 percent, so 2 percent is the only honest choice.
Where on the package does the ingredient list have to appear?
On either the principal display panel or the information panel, per 101.4(a)(1) read with 101.2. The information panel is the panel immediately contiguous and to the right of the principal display panel, with alternatives when that space is unusable, such as folded flaps or can ends. Type may not be smaller than one-sixteenth inch in height, and information panel content must appear in one place with no other material interrupting it.
