# How To Substantiate Sustainability Claims: Third-Party Guide

> The Wellness Quality Institute turns real lab data into defensible, verified sustainability claims. Start your third-party review today.

**Published:** 2026-09-17 | **Updated:** 2026-10-31 | **Author:** mihir
**URL:** https://www.wellnessqualityinstitute.com/articles/sustainability-claims-third-party-review
**Type:** post

**Categories:** Certification

![How To Substantiate Sustainability Claims: Third-Party Guide](https://wellnessquality.sites.aigrowthagent.co/wp-content/uploads/sites/93/2026/09/1789553833349-af6d9df43174-1024x572.webp)

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## Content

*Written by: Scott Steveson, Specialist, Wellness Quality Institute | Last updated: October 18, 2026*

## Key Takeaways

- Third-party review evaluates whether existing laboratory data, methods, and scope support a specific sustainability claim. It is distinct from testing or certification.
- US brands must substantiate environmental claims under FTC Green Guides. Independent review strengthens defensibility and reduces legal exposure.
- Claims must stay within clear boundaries for product, particle-size range, polymer panel, and production period to avoid scope creep.
- “None detected” results are bounded by detection floor, polymer panel, and lot tested. They do not support absolute “plastic-free” language.
- The Wellness Quality Institute’s Plastic-Free Pathway Verification program independently reviews plastic-related lab data so brands can substantiate real progress without overstating results.

[Talk to WQI about Plastic-Free Pathway Verification](https://www.wellnessqualityinstitute.com/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)

## Who This Guide Helps And The Terms It Uses

This guide serves US brand-side sustainability leads, founders, marketing directors, and legal or procurement stakeholders at premium beverage, wellness, or clean-label consumer packaged goods companies that already hold third-party laboratory data or are about to publish a sustainability claim.

Several terms appear throughout and are defined here in plain language:

- **Third-party review:** assessment of evidence by an independent party, with no commercial interest in the outcome and no role in producing the data.
- **Verification:** a finding that a reviewed dataset meets defined criteria within a stated scope. It describes what the data supports within those boundaries.
- **Substantiation:** the documented evidence that supports a specific claim before the claim appears on packaging, a website, or an ad.
- **Scope:** the precise boundaries of what was reviewed, including product, parameters, production period, and method.
- **Detection floor (reporting limit):** the lowest concentration a given analytical method can reliably measure. Anything below this floor appears as “not detected” in the report.
- **Chain of custody:** the documented record of who handled a sample, when, and under what conditions, from collection through analysis.
- **Blanks and contamination controls:** samples of a clean matrix carried through the same analytical process as field samples, used to detect contamination introduced by the laboratory, equipment, or reagents rather than by the product itself.
- **Accreditation:** formal recognition by an independent body that a laboratory meets defined competence requirements for specific methods and matrices.

The US regulatory context shapes how claims must be supported. The [FTC Green Guides](https://www.ftc.gov/legal-library/browse/rules/green-guides) govern environmental marketing claims made to US consumers. Under [16 CFR 260.6(c)](https://www.ftc.gov/legal-library/browse/rules/green-guides), a company keeps its own substantiation obligation regardless of any outside review. A third-party mark does not transfer that duty to the reviewer. Laboratory capability and method limits also constrain what any claim can say. A method that cannot detect particles below 50 micrometers cannot support a claim about particles smaller than that.

[Microplastics Claims: Independent Dataset Review Explained](https://www.wellnessqualityinstitute.com/articles/water-quality-third-party-review/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent) provides additional context on how independent review differs from self-reported results.

## What Third-Party Review Covers In Practice

Three related activities often get blurred and benefit from clear separation:

- **Laboratory testing** produces data, which means a measurement of what was found, in what quantity, using a specific method, on a specific sample.
- **Third-party review** assesses whether that data, its method, and its scope support a specific claim. The reviewer examines the evidence rather than the physical product.
- **Certification** implies a settled, guaranteed state, such as a representation that a product meets a defined standard absolutely. That type of guarantee is not scientifically available for plastic content, because no method can detect every particle size, every polymer type, or every production lot.

The distinction between review and certification affects legal risk. Under [16 CFR 260.6(c) of the FTC Green Guides](https://www.ftc.gov/legal-library/browse/rules/green-guides), a third-party mark or certification does not by itself substantiate every claim a company makes and does not transfer the company’s substantiation obligation to the reviewer. A seal that does not explain the basis for its award is treated by the FTC as an unqualified general environmental benefit claim. The [Green Guides treat that category as deceptive](https://greencalculus.com/standards/ftc-green-guides) because marketers are highly unlikely to substantiate all reasonable interpretations, and the Guides advise marketers to avoid such claims.

## The Standards Map For Plastic-Related Claims

Several frameworks guide environmental claim substantiation, and each plays a different role. None operates as a single mandated path. The table below shows which framework governs which kind of claim so you can see how they apply to plastic-related product statements.

| Framework | Claim Type It Addresses | Status |
| --- | --- | --- |
| [FTC Green Guides (16 CFR Part 260)](https://www.ftc.gov/legal-library/browse/rules/green-guides) | US environmental marketing claims, including “free of,” general environmental benefit, and third-party certification use | Administrative guidance under the FTC Act; [2012 edition operative as of October 2026](https://greencalculus.com/standards/ftc-green-guides); [revision pending](https://greencalculus.com/standards/ftc-green-guides) |
| [ISO 14021:2026](https://www.iso.org/standard/14021) | [Self-declared environmental claims about products, including “free of” and recycled content](https://standards.iteh.ai/catalog/standards/cen/8b219892-f458-419f-93c5-00baab1dbe87/en-iso-14021-2026); [requires claims to be part of a documented environmental statement programme](https://standards.iteh.ai/catalog/standards/cen/8b219892-f458-419f-93c5-00baab1dbe87/en-iso-14021-2026) | [Third edition](https://standards.iteh.ai/catalog/standards/cen/8b219892-f458-419f-93c5-00baab1dbe87/en-iso-14021-2026) published June 2026; [replaces ISO 14021:2016](https://standards.iteh.ai/catalog/standards/cen/8b219892-f458-419f-93c5-00baab1dbe87/en-iso-14021-2026) |
| ISSA 5000 | Report-level sustainability assurance engagements; an overarching standard that can cover all or part of an entity’s sustainability information, but does not by itself verify individual product-packaging claims | [Effective for periods beginning on or after December 15, 2026](https://faronline.se/dokument/isa/issa-/issa5000); [early application permitted](https://faronline.se/dokument/isa/issa-/issa5000) |
| [GRI 2-5](https://www.globalreporting.org/standards/) | [Disclosure of external assurance in sustainability reports; requires description of scope, standard, level, and limitations](https://reporting.academy/en/knowledge-hub/disclosure-guides/gri/gri-evidence-controls-and-assurance/gri-2-5-external-assurance-explained-assurance-policy-scope-level-prov) | [Current under GRI 2: General Disclosures 2021](https://reporting.academy/en/knowledge-hub/disclosure-guides/gri/gri-evidence-controls-and-assurance/gri-2-5-external-assurance-explained-assurance-policy-scope-level-prov) |

For a US brand making a product-level plastic claim, the FTC Green Guides are the primary operative framework. ISO 14021:2026 provides a structured approach to documenting self-declared claims and may be adopted voluntarily. [ISSA 5000 is an overarching sustainability assurance standard](https://greencalculus.com/standards/issa-5000) that can cover all or part of an entity’s sustainability information, but it does not by itself verify individual product-packaging claims. GRI 2-5 applies where a company publishes a sustainability report and has obtained external assurance over it.

[Microplastics Claim Verification: What Lab Data Can Prove](https://www.wellnessqualityinstitute.com/articles/microplastics-claim-verification-data/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent) examines how these frameworks interact with laboratory data in practice.

[Get your product's plastic claim independently reviewed.](https://www.wellnessqualityinstitute.com/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)

## How To Substantiate A Sustainability Claim With Third-Party Review

Whichever framework applies, the substantiation work follows the same five steps, from defining the claim to publishing only language the evidence supports.

1. **Define the exact claim and its boundaries.** Write out the precise claim before assembling any evidence. Specify the product, the parameter, such as microplastic particles above 20 micrometers using Raman spectroscopy, and the production or sampling period the data covers. A clearly bounded claim at the outset becomes far easier to defend later.
2. **Assemble the evidence.** Gather the documentation the claim rests on. Include supplier declarations, invoices, independent laboratory test reports, chain-of-custody records, blank and contamination control data, and any lifecycle assessments relevant to the claim. The evidence package should be complete before review begins.
3. **Confirm the method suits the matrix and the tested range supports the wording.** A method validated for drinking water may not be appropriate for a viscous beverage, and its reporting limit sets the smallest particle the claim can address. A limit of 50 micrometers cannot support a claim about particles smaller than that. Both questions need answers before anyone drafts claim language.
4. **Submit the dataset for independent review against published criteria.** An independent reviewer with no commercial interest in the outcome and no role in the testing assesses the full dataset against defined requirements. The review examines laboratory qualification, method suitability, tested range, polymer panel, reporting limits, blanks, spike recoveries, replicates, chain of custody, data recency, and product scope.
5. **Publish only the approved language with its scope and qualification attached.** The claim that emerges from review is bounded by what the evidence supports. It names the reviewed product, the tested range, the polymer panel, and the production period. It stays with those boundaries rather than extending to other products, other lots, or the company as a whole.

## What Evidence A Reviewer Looks For

A thorough independent review examines each of the following elements and links each one to why it matters for your claim.

![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.**

- **Laboratory qualification and accreditation:** whether the laboratory is recognized by an appropriate accreditation body for the specific method and matrix. General analytical capability does not replace method-specific accreditation.
- **Analytical method and matrix suitability:** whether the method used is appropriate for the product being tested. A method validated for clear water may not perform reliably in a product with high suspended solids or color.
- **Tested parameter or particle-size range:** the specific size range the method can detect. Results are meaningful only within the validated range of the instrument and method used.
- **Reporting limits:** the lowest concentration the method can reliably measure. A “none detected” result carries value only when the reporting limit is low enough to match the claim wording. A high limit weakens the claim.
- **Blanks and contamination controls:** samples of a clean matrix run alongside field samples to detect contamination introduced by the laboratory or equipment. Without clean blanks, a “none detected” result may reflect contamination management rather than the product.
- **Replicates and spike recoveries:** repeated measurements and samples spiked with known quantities of target analytes, used to confirm the method is performing reliably on the specific matrix.
- **Chain of custody:** the documented record of sample handling from collection through analysis. Gaps in chain of custody undermine the integrity of the result.
- **Data recency:** whether the data reflects current production. A result from a prior production period may not represent the product as currently manufactured.
- **Product scope:** whether the tested product matches the product for which the claim will be made, including the specific SKU, formulation, and packaging.

For a deeper examination of what testing can and cannot establish, see [What Microplastics Testing Proves And Where It Stops](https://www.wellnessqualityinstitute.com/articles/what-microplastics-testing-proves/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent).

## Why “None Detected” Has Built-In Limits

“None detected” is one of the most commonly misread results in environmental laboratory science. It does not mean none present. It means none found above that instrument’s detection floor, for the parameters or polymers screened, in the lot tested.

![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.**

Three boundaries define every non-detect result:

- **The detection floor:** a method that begins at 50 micrometers cannot see anything smaller. Particles below that size are invisible to the instrument, even though they may exist in the product.
- **The polymer panel:** a test that screens for eight polymer types cannot report on polymers outside that panel. A non-detect for polyethylene says nothing about a polymer not included in the analysis.
- **The lot tested:** lot-to-lot variability in manufacturing means one clean result does not guarantee the next. A single non-detect result reflects the production it was drawn from rather than every production run before or after.

Consider a neutral hypothetical. A laboratory report shows no microplastics detected above 50 micrometers using infrared spectroscopy, for a specific polymer panel, on a single production lot of a bottled water product. That report supports a narrow claim tied to those exact parameters. It cannot support a claim that the product contains no plastic, no microplastics, or no nanoplastics. The method cannot see below 50 micrometers, cannot screen every polymer, and cannot speak to any lot other than the one tested.

![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.**

This is why [Microplastics Lab Results: What The Data Actually Means](https://www.wellnessqualityinstitute.com/articles/independent-review-lab-results-microplastics/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent) is essential reading for any brand holding a “none detected” report and considering what claim it supports.

## Scope Lock For Defensible Verified Claims

The most common failure in environmental claim substantiation is scope creep. A single reviewed dataset, covering one product and one production period, gets stretched into a product-line claim, a company-wide claim, or a claim about a parameter the method never measured.

Scope lock prevents this outcome. Every verified claim should be explicitly bound to:

- The specific reviewed product or SKU
- The dataset submitted and accepted
- The tested particle-size range
- The polymer panel screened
- The production or sampling period the data covers

A claim that extends beyond any of these boundaries no longer rests on the reviewed evidence. It becomes a new claim that needs its own substantiation.

Public registries also play a role in trust. Expired or withdrawn findings should remain visible in any public registry rather than quietly disappearing. A record that stays visible and clearly marked with its current status builds more trust than one that vanishes. Buyers and journalists who check a claim after expiration deserve to see what was reviewed and when it lapsed.

[How To Conduct An Independent Microplastics Data Review](https://www.wellnessqualityinstitute.com/articles/independent-review-laboratory-microplastics-data/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent) walks through the scope-definition process in detail.

## Claim Language After Independent Review

Claim language after independent review must follow what the reviewed evidence supports. Desired marketing copy comes second.

**Permitted claim language** for products that met the standard under the Wellness Quality Institute’s (WQI’s) Plastic-Free Pathway Verification includes:

- “Reviewed and accepted under WQI’s Plastic-Free Pathway Verification standard”
- “WQI Plastic-Free Pathway Verified” for Standard Met products within registered scope only

**Prohibited claim language** applies regardless of what the data shows:

- “Plastic-free,” “microplastic-free,” “nanoplastic-free,” or “zero plastic” as product claims
- “Certified” or “certification” in connection with WQI verification
- Any health or safety claim
- Any compression of “Plastic-Free Pathway Verified” into “plastic-free verified.” The word “pathway” must always appear.
- Any extension of a single product’s result to a product line or the company as a whole

Approved language paired with a checkable registry reference helps a claim survive buyer diligence. A claim that cannot be independently verified rests entirely on the brand’s own authority, which independent review is designed to supplement.

The following disclaimer applies to all WQI Plastic-Free Pathway Verification claims and must accompany any public reference to the program:

>
*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 approval, government certification, or health or safety certification.*

## Where The Wellness Quality Institute Fits

The Wellness Quality Institute (WQI) operates as an independent verification body that reviews companies’ existing third-party laboratory data on plastic and microplastic content against a defined standard. This structure allows brands to substantiate real progress toward plastic-free standards while avoiding impossible zero-plastic claims.

WQI’s core program, Plastic-Free Pathway Verification, is governed by the standard WQI-CS-01. The program independently reviews a company’s existing laboratory dataset, testing methodology, product scope, and supporting controls against defined criteria focused on particle size and polymer type. These criteria align with the [California State Water Board’s drinking-water microplastics reference framework](https://www.waterboards.ca.gov/drinking_water/certlic/drinkingwater/microplastics.html) as a technical reference point. California did not create, approve, or endorse WQI or its standard, and verification is available to US companies nationally.

Every review produces one of two outcomes. **Standard Met** carries a verification decision, a scope-locked license to use the WQI mark, a public registry listing, and approved claim language. **Standard Not Met** is a private outcome, never described as a failed product, that can be resubmitted with updated information. WQI does not run laboratory tests and does not certify that any product is free of plastic. A single assessment fee covers review, verification decision, and registry listing, with no separate mark-license or registry fee. Independent laboratory testing is arranged and billed separately. Phase 1 focuses on water and suitable simple-liquid products, where testing methods are most defensible.

[Start a Plastic-Free Pathway review.](https://www.wellnessqualityinstitute.com/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)

## Common Challenges And How To Fix Them

Several recurring failures appear in datasets submitted for independent review. Each pattern has a recognizable warning sign and a practical fix.

- **Data that exists but was never assessed for adequacy.** This shows up when a brand holds a laboratory report but cannot answer basic questions about the method or reporting limits. The testing was often commissioned without a defined review purpose. The fix is to confirm before submission that the dataset includes method documentation, blank data, and chain of custody rather than only a results table.
- **A method unsuited to the matrix.** This appears when a laboratory uses a method validated for drinking water on a product with high color, viscosity, or suspended solids. The usual cause is that the laboratory was not asked to confirm method suitability for the specific product. The fix is to specify the product matrix in the laboratory request and ask the laboratory to document method suitability before sampling.
- **Reporting limits too high for the claim wording.** This problem emerges when a “none detected” result is reported at 100 micrometers but the brand wants to claim particles above 20 micrometers. Laboratories often reach this point because they used a default method rather than one suited to the claim. The fix is to define the required reporting limit in the laboratory request before samples are collected. Reanalysis after the fact is only possible if the sample is within holding time and sufficient volume remains.
- **Missing blanks or chain of custody.** This issue appears when the laboratory report contains results but no blank data or sample handling records. The laboratory was usually not instructed to run blanks or document chain of custody. The fix is to require blank data and chain-of-custody documentation as deliverables in the laboratory contract rather than as optional additions.
- **A claim drafted before the scope was defined.** This pattern appears when the marketing team writes packaging copy before anyone reviews the laboratory data. The process started with desired language instead of available evidence. The fix is to define the scope of the reviewed evidence first and then draft claim language that stays inside that scope.

## Frequently Asked Questions

### How Long Does A Review Take, And What Does It Depend On?

The timeline for an independent review depends primarily on the completeness of the submitted dataset. A package that includes full method documentation, blank data, chain-of-custody records, and a clearly defined product scope can move through review substantially faster than one that requires follow-up requests for missing documentation. Brands that assemble their evidence package before submitting, rather than gathering documents in response to reviewer questions, typically experience the shortest timelines. The review itself covers laboratory qualification, method suitability, tested range, polymer panel, reporting limits, blanks, spike recoveries, replicates, chain of custody, data recency, and product scope, so each of these elements needs to be present and legible in the submitted package.

### What Documentation Is Needed For Submission?

A complete submission package typically includes the full laboratory report with all raw data and qualifiers, method documentation identifying the analytical method and its validated range, blank and contamination control data, chain-of-custody records from sample collection through analysis, laboratory accreditation documentation, and a clear description of the product scope, including the specific SKU, matrix, and production or sampling period the data covers. Supplier declarations and invoices may also be relevant depending on the claim. The goal is to give the reviewer everything needed to assess what the data supports without requiring confidential business information to do so.

### Does Independent Review Replace Legal Or Advertising-Claims Review?

Independent review of a dataset against a defined standard does not replace legal counsel, regulatory counsel, or advertising-claims review. Companies remain responsible for ensuring that all product, packaging, and marketing claims are accurate, properly substantiated, and compliant with applicable law, including the FTC Green Guides and any relevant state consumer protection statutes. Independent review establishes what the evidence supports. Legal and advertising-claims counsel determine how that finding may be communicated in a specific regulatory and commercial context.

### What Happens If The Standard Is Not Met?

A Standard Not Met outcome under WQI’s Plastic-Free Pathway Verification remains private. It carries no public claim, no logo rights, and no registry listing. It is never described as a failed product. A Standard Not Met finding frequently reflects insufficient data, an unsupported method, or incomplete scope rather than anything about the product itself. The company may submit corrected or additional information for future review. Participating in the review process creates no public downside risk, so a brand that submits and receives a Standard Not Met outcome is in the same public position as one that never submitted.

### Does A Verification Mark Mean A Product Is Plastic-Free?

The WQI Plastic-Free Pathway Verified mark means that a company’s laboratory dataset was independently reviewed against defined criteria and met those criteria within the registered scope. It does not confirm complete absence of plastic. As the detection-floor, polymer-panel, and lot limits described earlier make clear, no laboratory result can confirm complete absence of plastic. The mark signals verified progress toward plastic-free standards. The word “pathway” in the program name describes direction of travel rather than a destination reached.

### Does California Endorse WQI’s Program?

California has not created a consumer-product plastic standard and does not endorse WQI. WQI aligns its criteria with the California State Water Board’s drinking-water microplastics reference framework because it is the most stringent credible public reference available for microplastics testing. That alignment does not mean California authorized, approved, or endorsed the program. A WQI verification is not a California approval, a government certification, or a health or safety certification. Verification is available to US companies nationally, including companies based outside California.

### How Long Does A Verification Last?

The verification period is 24 months from the sampling date of the most recent accepted dataset. Continued claim use after expiration requires re-verification using current data. This reflects the reality of lot-to-lot variability. A result reflects the production it was drawn from, and a mark that never expires cannot honestly represent a product as it is currently manufactured. Expired registry entries remain publicly visible and marked “Expired,” so the record stays honest over time rather than quietly disappearing.

### How Do You Keep A Claim Inside Its Scope?

The practical discipline is to bind every public claim to the registry entry that supports it. The registry entry records the verified product, the tested range, the polymer panel, the production period, and the current status of the verification. Any claim that goes further than the registry entry, such as covering a different product, a broader parameter range, or a longer time period, sits outside the scope of the reviewed evidence and requires its own substantiation. Providing a registry ID with every public claim, and making that ID checkable, keeps the claim honest as the product, the production, and the verification status change over time.

## Conclusion: Turn Real Lab Data Into Defensible Claims

Substantiation happens at the level of the reviewed evidence rather than the marketing copy. The most common failure is a claim that outruns its scope, which can sound defensible until a retailer, a journalist, or a litigant asks what it rests on. Independent review against published criteria converts existing laboratory data into language a brand can defend because it establishes what the data shows and what the data can honestly support.

Scope lock keeps a claim true over time. A claim bound to the scope described earlier is a claim that holds up when checked. A claim that drifts beyond those boundaries becomes a liability, even when the underlying data is strong.

For US brands that already hold third-party laboratory data, the practical next step is an independent review of the data in hand against defined criteria, establishing what it supports and what language it permits.

[See whether your lab data supports a verified claim.](https://www.wellnessqualityinstitute.com/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)

## Read Next

- [How To Verify Supplier Environmental Claims: A Guide](https://www.wellnessqualityinstitute.com/articles/third-party-claims-validation-suppliers/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)
- [Third-Party Verification for Plastic Reduction Claims](https://www.wellnessqualityinstitute.com/articles/third-party-verification-plastic-reduction/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)
- [Retail Sustainability Claim Verification Programs Explained](https://www.wellnessqualityinstitute.com/articles/retail-sustainability-claim-verification-programs/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)
- [Third-Party Claim Validation Standards for Product Claims](https://www.wellnessqualityinstitute.com/articles/third-party-claim-validation-standards/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)
- [How To Verify A Plastic Reduction Claim: A Six-Step Audit](https://www.wellnessqualityinstitute.com/articles/plastic-reduction-claim-verification-guide/?utm_term=sustainability-claims-third-party-review&utm_campaign=ai_growth_agent)

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## Citations

- [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)
- [Plastic Claim Substantiation: A US Compliance Guide](https://www.wellnessqualityinstitute.com/articles/plastic-claim-substantiation-compliance-guide)
- [Microplastics Verification Standards: A Complete Guide](https://www.wellnessqualityinstitute.com/articles/microplastics-verification-standards-guide)

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