Mexico's $2.8B Functional Food Market: The NOM-051 Claim Restrictions That Make 'No Added Sugar' and 'High Protein' Illegal as Front-of-Pack Labels

Your protein bar says "High Protein" and "No Added Sugar" on the front. In Mexico, the second claim can be illegal, and the first one has to leave the front panel the moment your label carries a single warning seal. That is the short version of the NOM-051 health claims functional food Mexico labeling restrictions, and it catches US functional food brands at the worst possible moment: after the label is printed and the container is booked.

Mexico's functional food market was worth $2.8B in 2024 according to IMARC, growing at 5.8% a year toward $4.9B by 2033. Other research firms put the number anywhere between $1.7B and $7B depending on what they count as "functional." Whatever the definition, the buyers are the same middle-class consumers in CDMX, Monterrey and Guadalajara who buy protein, low-sugar, gut-health and energy products, the exact categories US DTC brands built their businesses on. More than 65 million of them shop online.

Here is what the rule actually says, which claims survive it, what the seal thresholds are (they are not what most US founders assume), what it costs to fix, and what enforcement has looked like since 2021.

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The rule lives in section 6.3 of NOM-051, and it has three parts

Section 6.3 of NOM-051 decides what the front panel can say for any product in Mexico's $2.8B functional food market that carries 1 or more of the 5 warning seals, and it has been in force since the 2020 modification was published in the Diario Oficial de la Federación on March 27, 2020. Most US founders meet NOM-051-SCFI/SSA1-2010 through the black octagons: EXCESO CALORÍAS, EXCESO AZÚCARES, EXCESO GRASAS SATURADAS, EXCESO GRASAS TRANS, EXCESO SODIO. Our complete NOM-051 labeling guide covers the seals themselves. This post is about what the seals do to everything else on the label.

Section 6.3 ("Declaraciones nutrimentales y saludables") says that when a product carries any of the seals, or either of the two front legends ("CONTIENE EDULCORANTES, NO RECOMENDABLE EN NIÑOS" under 7.1.3, "CONTIENE CAFEÍNA, EVITAR EN NIÑOS" under 7.1.4), three rules apply:

• a) No health claims at all. Nothing that links the product to a health outcome: "supports immunity," "gut health," "for energy and focus." Gone.
• b) No nutrient claim directly related to the seal you carry. If the label shows EXCESO AZÚCARES, you cannot say "No Added Sugar," "Low Sugar" or "Reduced Sugar." If it shows EXCESO GRASAS SATURADAS, "Low Fat" is out.
• c) Every other nutrient claim moves to the information surface, meaning any panel other than the principal display panel, in a font no taller than the minimum height that NOM-030 sets for the net content. "High Protein," "20g Protein," "Source of Fiber" are not banned. They are exiled to the back or side, in small type.

Two details make this harder than it reads. First, the trigger is not "a sugar seal for a sugar claim." A single EXCESO CALORÍAS seal is enough to push "High Protein" off the front. Second, the sweetener legend counts as a trigger. A zero-sugar electrolyte powder sweetened with sucralose or stevia carries "CONTIENE EDULCORANTES" on the front, so it loses its health claims and its "Sugar Free" moves to the back, even though it never triggered a seal.

Section 6.2 f) closes the obvious loophole: any claim about the absence or non-addition of a nutrient ("No Added Sugar," "Zero Sodium") is treated as a nutrient claim and follows the same rules.

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Which US claims survive, which move to the back, and which are prohibited

Of the 9 claims below, only 2, or 22%, keep their place on the front once a seal or legend appears, and both are non-nutrient claims. The table uses the actual mechanism in section 6.3 rather than a blanket "prohibited."

The descriptor thresholds ("low," "free," "reduced," "high") do not live in NOM-051. They live in NOM-086-SSA1-1994, which defines, for example, "sin azúcar" as under 0.5 g of sugar per serving and "bajo en sodio" as 140 mg or less per serving. A claim that meets NOM-086 can still be moved off the front by NOM-051. The two standards stack.

One more restriction that has nothing to do with nutrients: section 4.1.5 bans cartoon characters, celebrities, athletes, mascots and interactive elements aimed at children on any product with a seal or the sweetener legend. That rule, not a claim, is what triggered the largest enforcement action to date (more on that below).

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NOM-051 health claims functional food Mexico labeling restrictions on Amazon and MercadoLibre listings

Ecommerce is the fastest entry point into a $2.8B market, and it does not exempt you from any of this. Food and beverage is one of the faster-growing categories on both Amazon Mexico and MercadoLibre, and the healthy snacks market intelligence report shows the category is underpenetrated by US brands relative to demand.

NOM-051 regulates the label on the package, and the package is what arrives at the buyer's door regardless of channel. Amazon Mexico's seller requirements for food and supplements call for product images and information in Spanish, with a photo of the full ingredient list for supplements. In practice your listing images show the same front panel that section 6.3 governs. If your hero image is the US label with "High Protein" next to two black octagons, the listing is advertising a non-compliant label to a regulator that reads listings.

The protein bars market data shows how contested the category is on both marketplaces. You cannot upload your US listing images and fix the label later. Every product image showing front-of-pack claims needs to match the Mexican label before you go live, and the Mexican label needs to pass section 6.3 first. See MercadoLibre for US brands for the listing mechanics.

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The seal thresholds are per 100 g and by percent of energy, not per serving

Every threshold in Table 6 of NOM-051 is expressed per 100 g or 100 mL, and 3 of the 5 are expressed as a share of total energy (10%, 10% and 1%), which is why brands that evaluate their US nutrition facts per serving get the answer wrong. The table below is the one in force today (Phase 2, extended through December 31, 2027 by a joint Secretaría de Economía and COFEPRIS agreement published in the DOF on July 31, 2025, per Arochi & Lindner).

Table 6 thresholds for solids (per 100 g)

Table 6 thresholds for liquids (per 100 mL)

Source: Tabla 6 and the second transitory article of the 2020 modification to NOM-051, Diario Oficial de la Federación, March 27, 2020.

Two rules sit on top of the table. Under Phase 2, only the critical nutrients you added are evaluated: add sugars and Mexico evaluates sugars and calories; add fats and it evaluates saturated fat, trans fat and calories; add sodium and it evaluates sodium only. Under Phase 3, which now starts January 1, 2028, adding any one critical nutrient triggers evaluation of all of them, including the ones that occur naturally. The NOM-051 Phase 3 post covers what that does to nut-based and dairy-based products.

"Free sugars" is the other trap. Section 3.6 of the norm counts sugars from honey, syrups, fruit juices and juice concentrates as free sugars. A granola sweetened with apple juice concentrate is an "added free sugars" product under NOM-051 even if the US label says "No Added Sugar."

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Two worked examples: a protein bar and a "no added sugar" granola

Run the numbers on a 60 g whey protein bar with 250 kcal, 20 g of protein, 6 g of fat (3 g saturated) and 8 g of sugars (6 g of them added), and it carries 2 seals, with saturated fat at 10.8% of energy. Per 100 g that bar has 417 kcal, so EXCESO CALORÍAS. Its 5 g of saturated fat per 100 g supply 45 kcal, or 10.8% of energy, so EXCESO GRASAS SATURADAS. Its 10 g of free sugars supply 40 kcal, or 9.6% of energy, so no sugar seal, by 0.4 points.

With 2 seals on the front, section 6.3 applies in full. No health claims. No "Low Fat." "20g Protein" and "High Protein" can appear only on the information surface, in small type. The front panel is the brand name, the product name, two octagons and whatever design does not make a claim. The same math applies to the plant protein market and the sports nutrition market. A plant-based bar with added coconut oil is not exempt.

Now a granola: 450 kcal per 100 g, 12 g of free sugars per 100 g from apple juice concentrate. Those 12 g supply 48 kcal, or 10.7% of energy, so EXCESO AZÚCARES. Because the seal is the sugar seal, "No Added Sugar" is now a claim directly related to the seal, which section 6.3 b) prohibits anywhere on the label. The claim that defined the product in the US is not moved to the back. It is gone.

One more: "Keto Friendly" and "Net Carbs" have no regulatory standing. Section 6.3 limits nutrient claims to nutrients with reference values (energy, protein, carbohydrates, fats, fiber, sodium, vitamins, minerals). "Net carbs" is not one, and "keto" is not a nutrient. You can use both in a blog post or a social caption. On the label or in a regulated listing field they have no defensible basis. The keto snacks market intelligence report gets into how brands in the category position instead.

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Costs and timeline to get compliant

A full Mexico label compliance project for a typical DTC food brand runs $3,700 to $10,000 and takes 6 to 10 weeks, and none of it is a translation job. It is a re-evaluation of the claim strategy, new label files, and in some cases a reformulation decision.

The sticker overlay, a Mexico-specific label applied over the US label, is the fastest path for a test shipment and works for the T1 courier import model at low volume. At scale you want a Mexico-specific label version, for unit cost and for shelf presentation. Distributors and retailers push back on visible overlays.

The aviso de funcionamiento is a notification, not an approval: you file it and can operate on the acknowledgment. The aviso de funcionamiento explainer covers the filing and the errors that get it bounced.

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Five mistakes US brands make on NOM-051 claim compliance

Of the 5 mistakes below, 3 come from reading the rule as "seals only" and 2 come from reusing US numbers, and each one costs at least 1 label reprint at $0.08 to $0.25 per unit.

Mistake 1: assuming the FDA paperwork transfers

Your FDA Certificate of Free Sale confirms the product is legally sold in the US. It says nothing about whether your claims are permitted in Mexico. As the compliance stack overview lays out, the label has to be right before you import, not after.

Mistake 2: letting the distributor own the label

Distributors know how to sell. They are not label compliance specialists, and under the Ley General de Salud the responsibility for the label sits with the party that puts the product on the market under its brand. A buyer's shelving approval is not a regulatory review. Read Mexico isn't Canada: 5 assumptions that will cost you 6 months before you sign a distribution agreement that leaves this unassigned.

Mistake 3: treating "no Added Sugar" as a loophole

The reasoning goes: "I'm not claiming a nutrient is present. I'm saying nothing was added. The seal is about total sugar. No conflict." Section 6.2 f) says absence and non-addition claims are nutrient claims. Section 6.3 b) says nutrient claims directly related to a declared seal are prohibited. And section 3.6 says juice concentrates are free sugars. The loophole closes from three directions.

Mistake 4: ignoring the reformulation math

Some products cannot carry front-of-pack claims at their current formula. A bar that needs "High Protein" on the front has to clear every seal: under 275 kcal per 100 g, saturated fat under 10% of energy, free sugars under 10% of energy. For some bars that is a recipe adjustment. For others it is a different product. Decide before you book a container. The reformulation requirements post covers the formula changes that kill deals with Mexican retailers.

Mistake 5: evaluating seals with per-serving US numbers

Your US panel is per serving. Table 6 is per 100 g and by percent of energy. A 40 g serving with 3 g of saturated fat looks harmless until you convert it: 7.5 g per 100 g, 67 kcal from saturated fat, which is 10% of energy at 670 kcal per 100 g and well above it at anything lower. Section 4.5.2.4.15 accepts values from laboratory analysis, databases or internationally recognized tables, so the source of the numbers is flexible. The unit of evaluation is not.

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What enforcement looks like: fines of 6,000 to 12,000 UMA and immobilized inventory

The fine for a labeling violation under article 421 of the Ley General de Salud runs from 6,000 to 12,000 UMA, which at the 2026 UMA of MXN 117.31 set by INEGI is MXN 703,860 to MXN 1,407,720, roughly $38,000 to $76,000. Article 421 lists article 212, the labeling article, by name. The fine is rarely the expensive part. The expensive part is the inmovilización, the precautionary immobilization of inventory that COFEPRIS and Profeco apply on the spot.

Every one of those operations targeted the label, and the December 2021 one targeted imports specifically. The pattern since then is joint COFEPRIS and Profeco verification sweeps of supermarket shelves, with the product held first and the paperwork sorted out afterward. The COFEPRIS registration timeline post covers where label problems show up in the launch sequence.

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The sugar tax dimension you also need to model

Mexico's 2026 IEPS rate increase, covered in the Mexico sugar tax post, created a $3.19B opening for reformulated alternatives while raising the cost of sugar-heavy products. NOM-051 claim restrictions do not exist in isolation. The tax hits the same products that lose their front-of-pack claims.

The brands that stay below the Table 6 thresholds keep their claims on the front and avoid the IEPS exposure at the same time. The regulatory incentive and the tax incentive point in the same direction. The functional beverages market intelligence report shows which subcategories are positioned for that, and the prebiotic soda market data covers US brands that used low-sugar positioning to sidestep both.

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What to do before you print a single label

Six steps, in order, and the first one costs $0: run your current nutrition facts against Table 6 per 100 g and by percent of energy, and count your seals.

1. Count your seals. Convert every US number to per 100 g or 100 mL, express sugars, saturated fat and trans fat as a share of energy, and compare against Table 6. Zero seals and no sweetener or caffeine legend means your claim strategy is largely intact. One seal means section 6.3 applies in full.
2. Classify every claim on your US label as health claim, nutrient claim directly related to a seal you carry, or other nutrient claim. The first two categories are gone. The third moves to the back.
3. Decide: reformulate or reposition. For some brands, clearing the thresholds is a minor formula adjustment. For others the product's identity is built on macros that will always trigger seals, and the answer is to compete on ingredients, taste and brand story instead of nutrient claims.
4. File the aviso de funcionamiento if you have not. It is free, it is a notification, and nothing moves without it.
5. Commission the per-100 g analysis and lock the seal determination and the NOM-051-format nutrition table before the designer starts.
6. Brief a designer who has done NOM-051 labels and get a legal review of every declaración you keep. The review runs $500 to $1,500 and takes about a week.

For the competitive picture by channel, the food and beverage market intelligence report has category-level data. The for food brands page covers the full entry framework, and the DIY comparison documents what doing this in-house costs in time.

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One more thing on the word "functional"

The label "functional food" appears on $2.8B worth of products in Mexico and on 0 pages of NOM-051. Alimento funcional has no regulatory definition in the norm. COFEPRIS classifies by composition: a product with added vitamins, minerals, herbs or bioactive compounds above certain levels can be treated as a suplemento alimenticio rather than a food, which changes the regulatory path, the permitted claims and the filings. The supplement classification guide covers the boundary.

This matters for protein powders with added adaptogens, fortified bars and nootropic-positioned snacks. The category you assume you are in and the category COFEPRIS puts you in are not always the same. Find out which one applies before you build a label around it.

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The claim restrictions in section 6.3 are specific, and the enforcement record since 2021 is public. The brands that do well in this market did the label work before the first print run, not after the first verification sweep.

• Read: the complete NOM-051 labeling guide
• Read: reformulation requirements that kill deals
• Read: the Mexico compliance stack in the right order
• Free tool: Mexico Opportunity Scanner

If you want to know where your product sits before you spend on labels or logistics, the free Mexico Test Plan maps the compliance, channel and unit-economics sequence for your specific product.