# How To Substantiate Clean Label Claims Defensibly

> The Wellness Quality Institute turns real lab data into clean label claims regulators and courts can't challenge. Get third-party verified today.

**Published:** 2026-08-19 | **Updated:** 2026-10-31 | **Author:** renatoloureiro
**URL:** https://www.wellnessqualityinstitute.com/articles/avoiding-unsubstantiated-clean-label-claims
**Type:** post

**Categories:** Certification

![How To Substantiate Clean Label Claims Defensibly](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/08/1786912209963-98166a2d7e37-1024x572.webp)

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## Content

*Written by: Scott Steveson, Specialist, Wellness Quality Institute | Last updated: October 25, 2026*

## Key Takeaways

- “Clean label” has no legal definition under U.S. law, so every objective claim needs documented evidence before publication to reduce FTC enforcement and class-action risk.
- Absolute language such as “free,” “zero,” or “100%” calls for absolute proof. Without a named method, detection limit, and tested scope, these claims are likely to fail regulatory or legal scrutiny.
- Claims like “natural,” “clean,” “non-toxic,” and “plastic-free” work best as bounded, verifiable statements. Retire any claim that no current evidence file can support.
- Third-party verification, such as The Wellness Quality Institute’s Plastic-Free Pathway Verification, confirms only the reviewed dataset, method, product, and period, not an absolute state or entire brand.
- The Wellness Quality Institute helps brands substantiate clean-label claims by reviewing existing laboratory data against published standards so marketing language stays specific, accurate, and defensible.

[See how your lab data can back your label claims](https://www.wellnessqualityinstitute.com/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)

## Start With The Definitional Premise

“Clean label” has no legal definition under U.S. law. No federal regulator defines it, and no statute governs its use. The [FDA’s “Use of the Term Natural on Food Labeling” policy](https://www.fda.gov/food/food-labeling-nutrition/use-term-natural-food-labeling) is informal guidance, not a binding rule. The agency has never completed rulemaking to define even “natural,” let alone the broader category of “clean.” The [FTC’s advertising-substantiation requirement](https://www.ftc.gov/business-guidance/resources/advertising-faqs-guide-small-business) fills the gap. Advertisers must hold a reasonable basis for any objective claim before publishing it. An unsubstantiated clean-label claim is therefore exposed to FTC enforcement regardless of whether a formal definition exists.

The thesis of this guide is simple. A claim is only as defensible as the evidence file behind it. What makes a claim defensible is the documented evidence behind it, not the words on the label.

## Know What Regulators Actually Enforce When You Substantiate Clean Label Claims

Regulators and marketers use different vocabularies. Words like “clean,” “natural,” “pure,” and “free-from” carry strong shopper assumptions, but no statute backs those assumptions.

The FDA’s “natural” policy, for example, is informal guidance stating that [nothing artificial or synthetic has been added to a food that would not normally be expected to be there](https://vkaff.com/newsroom/what-are-natural-flavours). The policy [does not address how a food was grown, how it was processed, or whether it carries any nutritional benefit](https://vkaff.com/newsroom/what-are-natural-flavours). It has never been codified through notice-and-comment rulemaking. The FDA’s February 5, 2026 “no artificial colors” action, which [allows companies to claim products contain no artificial colors when they contain no petroleum-based colors](https://fda.gov/news-events/press-announcements/fda-takes-new-approach-no-artificial-colors-claims), was issued as an [enforcement-discretion letter to industry](https://fda.gov/news-events/press-announcements/fda-takes-new-approach-no-artificial-colors-claims), not a rule defining “natural.”

Enforcement risk arrives from three directions at once. The FTC can act against objective claims that lack a reasonable basis. Retailers and procurement teams increasingly require documented substantiation as a condition of placement. Private class-action plaintiffs have also challenged categorical “natural” labeling on products containing synthetic inputs. A [proposed $9 million settlement against Dr. Squatch](https://prnewswire.com/news-releases/if-you-purchased-certain-dr-squatch-products-from-november-1-2018-through-august-29-2026-you-could-be-eligible-for-payment-from-a-class-action-settlement-302863248.html) resolved claims that personal-care products labeled “natural” contained ingredients plaintiffs alleged were synthetic. A [nationwide class action against McCormick](https://openclassactions.com/settlements/mccormick-seasonings-settlement.php) covered nearly nine years of purchases over “Natural” and “All Natural” seasoning claims. A [June 2026 client alert from Benesch](https://beneschlaw.com/insight/going-back-to-the-well-plaintiffs-target-wellness-branding-by-attacking-ingredients) documents active litigation targeting “free-from” and wellness claims based on a single ingredient or processing step that plaintiffs argue contradicts the broader label message.

## Red Flags That Signal An Unsubstantiated Clean Label Claim

The following patterns indicate a claim that is likely to fail scrutiny.

1. **Absolute or totalizing language (“free,” “zero,” “100%,” “never”).** Absolute claims require absolute evidence. In most categories, especially plastic and microplastic claims, that evidence does not exist.
2. **A claim with no named method, limit, or scope behind it.** “Clean” means nothing without a definition of what was measured, by what method, and against what threshold.
3. **“Free-from” language that names one substance while saying nothing about its chemical relatives.** “BPA-free” does not mean free of all bisphenols or plasticizers. A plaintiff can argue the label implies more than it states.
4. **A lab report cited without its detection floor, tested range, or polymer panel.** A result of “none detected” is bounded entirely by what the instrument could see. Citing the result without the floor misrepresents what the data supports.
5. **Self-reported testing presented as independent proof.** A company reviewing its own results carries an obvious interest in the outcome. The market reads self-reported data as marketing, regardless of how rigorous the underlying work was.
6. **A single product’s result stretched across a product line or the whole brand.** One lot, one SKU, one production period. That is the scope the data covers, and nothing wider.
7. **Vague provenance words (“clean,” “pure,” “nontoxic”) with no defined meaning.** These terms have no regulatory definition and no agreed standard. Without a named definition, they are unsubstantiable as objective claims.
8. **Claims that imply a government or state endorsement that does not exist.** No federal agency certifies food or beverage products as “clean,” “natural,” or “plastic-free”. At the federal level, environmental marketing claims fall under the FTC Act and the FTC’s non-binding Green Guides, which address claims such as “free-of” and “nontoxic” but establish no certification. Implying otherwise is a misrepresentation.

## How To Rewrite Risky Claims Into Defensible Statements

The goal is to turn broad promises into specific, checkable statements. Each safer phrasing below focuses on what was tested, by what method, over what range, for which product and period.

### “Natural”

Shoppers often read “natural” as meaning the product contains nothing artificial or synthetic. An ingredient-by-ingredient audit against the FDA’s informal policy (no added color, no artificial flavors, no synthetic substances), with documentation of each ingredient’s source and processing, can support a bounded version. A safer phrasing is “No artificial flavors, colors, or synthetic preservatives added,” because each element can be verified against a named standard.

### “Clean”

Shoppers treat “clean” as a holistic purity signal. Because “clean” has no regulatory definition, no evidence file can support it as a standalone claim. Retire the word and replace it with the specific attributes it was meant to convey, such as “No artificial colors” or “No synthetic preservatives,” and substantiate each one separately.

### “Free-from”

Shoppers read “free-from” as a guarantee of absence. A bounded version needs testing for the named substance using a validated method, with the detection floor, tested range, and lot coverage disclosed. A safer phrasing is “No [substance] detected above [X] using [method] in [product] tested [period].” Claims that name one substance without addressing chemical relatives need extra qualification.

### “Non-toxic”

Shoppers read “non-toxic” as a safety guarantee. No evidence file can currently support an absolute non-toxicity claim for a consumer product. Toxicity depends on dose, context, and population, and no regulatory body has a legal definition of “non-toxic” for food or beverage labeling, even though agencies like the FDA impose safety and non-toxicity requirements on food-contact materials without defining the marketing term “non-toxic.” This claim cannot currently be supported by any evidence file and should be retired rather than softened.

### “Pure”

Shoppers read “pure” as meaning the product contains nothing beyond its stated ingredients. A bounded version relies on contaminant testing against named analytes, using a validated method, with detection limits disclosed, for the specific product and production period. A safer phrasing is “Tested for [named contaminants] using [method]; none detected above [limit] in [product] [period].”

Some claims cannot currently be supported by any evidence file. Retire those claims instead of softening them. A softened version of an unsubstantiable claim remains unsubstantiable.

[Get your claim language reviewed against a published standard](https://www.wellnessqualityinstitute.com/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)

## Understand What A Third-Party Mark Actually Verifies

For the claims that can be supported, a third-party mark offers one way to make the evidence checkable, as long as everyone understands the mark’s scope. A mark verifies a defined scope against a defined standard. That scope is narrower than shoppers usually assume. It covers a specific product, dataset, and period, not a whole brand or an absolute state.

The distance between shopper expectations and the actual scope is where many clean-label claim problems start. A mark that implies more than its scope supports becomes an unsubstantiated claim that now carries a third party’s name.

A public registry entry changes the nature of the claim. Instead of asserting a state (“this product is pure”), a registry-backed claim makes a finding checkable. A buyer, retailer, or journalist can look up exactly what was reviewed, under what standard, for which product, and over which period. The claim becomes verifiable rather than merely asserted.

The Wellness Quality Institute (WQI) operates Plastic-Free Pathway Verification (PFPV) as the substantiation path for plastic and microplastic claims built on existing independent laboratory data. WQI reviews a company’s existing third-party laboratory dataset, testing methodology, product scope, and supporting controls against WQI-CS-01, its defined review standard. WQI does not run laboratory tests. Every review produces one of two outcomes. Standard Met carries a verification decision and a scope-locked license to use the approved mark “WQI Plastic-Free Pathway Verified,” plus a public registry listing and approved claim language. Standard Not Met is a private outcome that can be resubmitted with updated information.

![Scientists in white coats working with samples and microscopes in a laboratory.](https://cdn.aigrowthmarketer.co/1784829434095-0fc8fbcf29fa.webp)**Only a small number of laboratories can genuinely test for microplastics, and capability varies by instrument and method. WQI reviews a company's existing third-party laboratory data against a defined standard — it does not run the tests itself.**

*Because a mark can be read more broadly than its scope, WQI states the limits of verification explicitly. WQI Plastic-Free Pathway Verification does not certify that a product contains zero plastic, microplastics, or nanoplastics. It shows that the company is on a verified pathway toward plastic-free standards. Verification applies only to the reviewed products, submitted datasets, tested ranges, polymer panels, production or sampling periods, and supporting controls. WQI verification is not a government certification or a health or safety certification.*

## Treat Plastic And Microplastic Claims As Clean Label Claims

“Plastic-free,” “microplastic-free,” and “zero plastic” are clean-label claims that follow the same substantiation rules as “natural,” “pure,” or “free-from.” They sit in the hardest category to support.

The technical limit is clear. Detection can establish presence, but it cannot establish complete absence. No laboratory today can confirm the complete absence of plastic across every particle size, polymer type, and production lot. The limit is a hard technical constraint, not a matter of diligence, and it has three causes. No method detects every particle size, no single test screens every polymer type, and a clean result on one production lot does not guarantee the next.

The California State Water Board’s drinking-water microplastics framework provides the most stringent public reference currently available. California defines microplastics as solid polymeric material with particles having at least three dimensions greater than 1 nanometer and less than 5,000 micrometers. Two validated analytical methods exist. Infrared spectroscopy (SWB-MP1-rev1) covers particles from 50 µm to 5,000 µm. Raman spectroscopy (SWB-MP2-rev1) covers particles from 20 µm to 5,000 µm. The 1–20 µm fraction is not validated under either method. The California definition reaches down to 1 nanometer, while the best validated methods begin at 20 or 50 micrometers, which are thousands of times larger. Everything below those floors currently sits beyond reliable commercial measurement.

![Colorful plastic fragments in water inside a laboratory petri dish.](https://cdn.aigrowthmarketer.co/1784829410323-fb401fc7b1e4.webp)**Microplastics are particles smaller than five millimeters. Current methods can count and identify them at the upper end of that range, but reliable measurement falls away as particles get smaller — a limit that shapes every honest claim.**

A result of “none detected” on a lab report means none found above that instrument’s detection floor, for the polymers screened, in the lot tested. It does not mean none present. Two 2018 studies show why that distinction matters. Contamination is widespread enough that absence claims look implausible on their face. A [2018 peer-reviewed study by Kosuth, Mason, and Wattenberg in PLOS ONE](https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0194970) found anthropogenic particles in 81% of 159 tap water samples across five continents. A [separate 2018 study led by Sherri Mason at SUNY Fredonia, published in Frontiers in Chemistry](https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00407/full), found microplastic contamination in 93% of 259 bottled water samples across eleven brands, with [polypropylene, the material used in bottle caps, as the most common polymer identified](https://www.frontiersin.org/journals/chemistry/articles/10.3389/fchem.2018.00407/full). Both findings align with the technical reality. Plastics are effectively present throughout the food and water supply, and current science cannot carry a claim of total absence.

![Fragments of plastic suspended in blue water below the surface.](https://cdn.aigrowthmarketer.co/1784829388732-c6255482b477.webp)**Plastic doesn't disappear — it fragments. These secondary microplastics are the breakdown products of everyday objects, and independent research now detects them across the water supply. Detection, though, establishes presence, not absence.**

That technical constraint is why plastic claims need a bounded, scope-locked form of substantiation instead of an absolute one. WQI reviews a company’s existing independent laboratory data against WQI-CS-01 and issues scope-locked approved claim language with a public registry ID. The verification applies only to the reviewed product, dataset, tested particle-size range, polymer panel, and production period. For broader context on environmental and packaging claims, WQI’s existing coverage includes [How To Prevent Greenwashing On Packaging Claims](https://www.wellnessqualityinstitute.com/articles/avoid-greenwashing-packaging-claims/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent) and [How To Substantiate Plastic-Free Claims Without Greenwashing](https://www.wellnessqualityinstitute.com/articles/plastic-free-claims-without-greenwashing/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent). Those articles address environmental and packaging claims broadly, while this guide focuses on pre-publication substantiation mechanics.

## Build the Evidence File Before Publication

Every claim that goes to print should have a corresponding evidence file. The file does not need to be elaborate. It needs to be complete for the specific claim it supports. Before publication, hold documentation covering each of the following:

- The claim as written, exactly as it will appear on packaging or in marketing materials
- The standard or definition the claim relies on, named and sourced
- The underlying dataset, meaning the actual laboratory data, not a summary
- The analytical method and its detection floor
- The tested range and, for plastic claims, the polymer panel
- The product and production period the data covers
- The laboratory’s accreditation and its relevance to the method used
- Any independent review or verification record, including its scope and expiration

Scope discipline is the governing principle. The evidence file supports exactly the product, period, and range it covers, and nothing wider. That rule matters because evidence is easy to over-extend. A result from one product does not carry to the rest of the line, a result from one lot does not carry to the brand, and a polymer panel says nothing about polymers outside it.

Legal and advertising-claims review remains the company’s responsibility and is not replaced by any third-party review. An independent verification of a dataset is not legal counsel, and it does not substitute for the company’s own obligation to ensure all claims are accurate and properly substantiated.

## Frequently Asked Questions

### Is “Clean Label” a Legal Term?

No. As covered above, no U.S. regulator defines “clean label” and no statute governs its use, so the FTC’s reasonable-basis requirement is what actually applies. A “clean label” claim is only as defensible as the specific, documented evidence behind it.

### Can a Company Be Sued Over a Clean-Label Claim?

Yes. Private class actions under state consumer-protection law remain a live exposure even where federal law is silent. Categorical “natural” labeling on products containing synthetic inputs has been the subject of nationwide settlements. Active litigation targets “free-from” and wellness claims based on a single ingredient or processing step that plaintiffs argue contradicts the broader label message. The absence of a federal definition does not insulate a brand from state-law claims.

### What Does “None Detected” Mean on a Lab Report?

It means none were found above the instrument’s detection floor for the polymers screened in the lot tested, which is a bounded result rather than proof of absence. A method validated above 50 micrometers cannot see anything smaller. A polymer panel covering eight polymer types says nothing about polymers outside the panel. A result from one production lot says nothing about the next. See the method discussion above for why those bounds matter.

### Can Any Product Currently Be Called Plastic-Free?

No laboratory today can confirm complete absence of plastic across every particle size, polymer type, and production lot. As the method ranges above show, the gap between the 1-nanometer definition and the 20/50-micrometer method floors is why an absolute “plastic-free” claim cannot be substantiated. Plastics are effectively present throughout the food and water supply, and current science cannot carry a claim of total absence.

### What Does a Third-Party Verification Actually Cover?

Third-party verification covers a defined scope against a defined standard, such as a specific dataset, method, product, and period, rather than a whole brand or an absolute state. It covers the reviewed product, dataset, tested range, polymer panel, and period, which is the scope described above, and nothing wider. It does not certify that a product contains zero plastic, microplastics, or nanoplastics. Every Standard Met outcome produces a public registry entry that makes the exact scope independently checkable.

### How Long Does a Verification Last?

WQI’s verification period is 24 months from the sampling date of the most recent accepted dataset. Continued claim use after that period requires re-verification using current data. Expired registry entries remain publicly visible and marked “Expired,” so the record stays honest over time rather than quietly disappearing.

### Does Verification Replace Legal Review?

No. Companies remain responsible for ensuring all product, packaging, and marketing claims are accurate and properly substantiated. WQI verification is an independent review of a dataset against a defined standard. It is not legal, regulatory, or advertising-claims counsel, and it does not replace those functions.

## Conclusion: Turn Real Lab Data Into A Claim You Can Support

The practical path through clean-label claim substantiation stays the same across categories. Rewrite absolute claims into bounded, descriptive ones. Retire the claims no evidence file can currently support. Hold documented evidence behind every word before it goes to print. For plastic and microplastic claims specifically, that approach means understanding what “none detected” actually means, what the validated method ranges are, and why current technology cannot substantiate an absolute claim of absence.

Real laboratory data, independently reviewed against a published standard, separates a claim a company asserts from a claim a company can defend. The Wellness Quality Institute exists to bridge that gap by reviewing existing independent laboratory data against WQI-CS-01 so brands can communicate genuine progress toward plastic-free standards without overclaiming what the science can support.

[Talk with WQI about substantiating your next round of label claims](https://www.wellnessqualityinstitute.com/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)

## What to Read Next

- [How To Substantiate Plastic-Free Claims Without Greenwashing](https://www.wellnessqualityinstitute.com/articles/plastic-free-claims-without-greenwashing/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)
- [How to Verify Plastic-Related Claims Using Lab Data](https://www.wellnessqualityinstitute.com/articles/verify-plastic-free-claims-lab/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)
- [Plastic Claim Substantiation: The Evidence Checklist](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-checklist/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)
- [Turn Lab Data into Defensible Plastic-Free Claims](https://www.wellnessqualityinstitute.com/articles/standard-evaluating-plastic-reduction-claims/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)
- [How To Verify Existing Lab Data on Plastic Content Claims](https://www.wellnessqualityinstitute.com/articles/verify-laboratory-data-plastic-content/?utm_term=avoiding-unsubstantiated-clean-label-claims&utm_campaign=ai_growth_agent)

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    - **Name:** Is Clean Label a Legal Term?
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    **Question:**

    - **Name:** Can a Company Be Sued Over a Clean-Label Claim?
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      - **Text:** Yes. Private class actions under state consumer-protection law remain a live exposure even where federal law is silent. Categorical natural labeling on products containing synthetic inputs has been the subject of nationwide settlements. Active litigation targets free-from and wellness claims based on a single ingredient or processing step that plaintiffs argue contradicts the broader label message. The absence of a federal definition does not insulate a brand from state-law claims.
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      - **Text:** It means none were found above the instruments detection floor for the polymers screened in the lot tested, which is a bounded result rather than proof of absence. A method validated above 50 micrometers cannot see anything smaller. A polymer panel covering eight polymer types says nothing about polymers outside the panel. A result from one production lot says nothing about the next. See the method discussion above for why those bounds matter.
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    - **Name:** Can Any Product Currently Be Called Plastic-Free?
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      - **Text:** No laboratory today can confirm complete absence of plastic across every particle size, polymer type, and production lot. As the method ranges above show, the gap between the 1-nanometer definition and the 20/50-micrometer method floors is why an absolute plastic-free claim cannot be substantiated. Plastics are effectively present throughout the food and water supply, and current science cannot carry a claim of total absence.
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    - **Name:** What Does a Third-Party Verification Actually Cover?
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      - **Text:** Third-party verification covers a defined scope against a defined standard, such as a specific dataset, method, product, and period, rather than a whole brand or an absolute state. It covers the reviewed product, dataset, tested range, polymer panel, and period, which is the scope described above, and nothing wider. It does not certify that a product contains zero plastic, microplastics, or nanoplastics. Every Standard Met outcome produces a public registry entry that makes the exact scope independently checkable.
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    - **Name:** How Long Does a Verification Last?
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      - **Text:** WQIs verification period is 24 months from the sampling date of the most recent accepted dataset. Continued claim use after that period requires re-verification using current data. Expired registry entries remain publicly visible and marked Expired, so the record stays honest over time rather than quietly disappearing.
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    - **Name:** Does Verification Replace Legal Review?
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      - **Text:** No. Companies remain responsible for ensuring all product, packaging, and marketing claims are accurate and properly substantiated. WQI verification is an independent review of a dataset against a defined standard. It is not legal, regulatory, or advertising-claims counsel, and it does not replace those functions.

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## Citations

- [Credible Plastic-Free Claim Language: A Practical Playbook](https://www.wellnessqualityinstitute.com/articles/credible-plastic-free-claim-language)
- [Retail Supplier Plastic Reduction Compliance & Proof](https://www.wellnessqualityinstitute.com/articles/retail-supplier-plastic-compliance-guide)
- [How To Verify Plastic Contamination In Protein Powder](https://www.wellnessqualityinstitute.com/articles/verify-protein-powder-plastic-contamination)
- [Plastic Claim Substantiation: Evidence Before You Claim](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-evidence-requirements)
- [How To Make Plastic Reduction Claims That Hold Up](https://www.wellnessqualityinstitute.com/articles/substantiate-clean-label-plastic-reduction)

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