How We Assess Manufacturers
Every manufacturer in the Inventory Ready directory goes through the same six-gate evaluation framework. No exceptions, no shortcuts, no pay-for-better-scores.
The Six Gates
Each gate represents a principle we apply to every manufacturer assessment. A manufacturer doesn't “pass” or “fail” individual gates. The gates shape how we gather, evaluate, and present information.
1. Evidence
Claims must be backed by documentation, not marketing copy. We look for FDA registration numbers, certification documents, third-party audit reports, and publicly available compliance records. If a manufacturer claims a certification but we can't find supporting documentation, we note it as “self-reported.”
What disqualifies: Manufacturers who refuse to provide any verifiable documentation or whose claims directly contradict public records.
2. Freshness
Information must be reviewed and dated within the last 12 months. The supplement manufacturing landscape changes. Facilities expand, certifications lapse, ownership transfers. Every listing shows a “last reviewed” date so you know how current our assessment is.
What disqualifies: We remove listings where we can no longer confirm basic operational status (active facility, current registrations).
3. Provenance
Sources are cited for every key claim. Each vendor listing includes a sources section that links to the documentation backing our assessment. You can check our work.
What disqualifies: Claims we cannot trace to any source are either removed or clearly labeled as unverifiable.
4. Challenge
Inconsistencies are flagged, not hidden. If a manufacturer's website claims one thing but public records show another, we note the discrepancy. If online reviews consistently mention issues, we acknowledge them. We're not advocates for the manufacturers we list.
What disqualifies: Patterns of misrepresentation where public claims consistently contradict verifiable records.
5. Disclosure
Material connections are stated on every listing. If a manufacturer has any business relationship with Inventory Ready beyond a free directory listing, it's disclosed directly on their profile. Revenue details are on our How We Get Paid page.
What disqualifies: Nothing. Disclosure is about us, not the manufacturer. But undisclosed conflicts on our end would violate our own method.
6. Abstention
When we can't assess something, we say so explicitly. Every listing includes a “What We Couldn't Verify” section. We don't fill gaps with assumptions or omit inconvenient limitations.
What disqualifies: Nothing. Abstention means we acknowledge our limits rather than pretending we don't have them.
A Note on Our Process
Our research workflow uses AI tools for data collection and analysis. All findings are checked against primary sources, and every assessment is reviewed and finalized by a human editor. AI assists the process. It does not make the judgments.
Assessment Tiers
Every manufacturer on Inventory Ready falls into one of four tiers based on the depth of our assessment. These tiers describe how thoroughly we have reviewed a listing, not how good the manufacturer is.
Listed
Basic directory entry compiled from publicly available sources. Company information, location, stated capabilities, and self-reported certifications. No independent verification attempted.
Records Reviewed
Public records checked against independent databases. FDA registration confirmed, state business filings reviewed, and publicly accessible certification directories searched.
Compliance Signals Reviewed
Deeper review of compliance indicators. Third-party certification databases checked (NSF, USP, SQF public directories). FDA warning letter history reviewed. Discrepancies between manufacturer claims and public records documented.
IR Vetted Partner
Manufacturer has engaged directly with Inventory Ready. Profile information confirmed or corrected by the company. References from brand clients collected and documented. This tier requires active manufacturer participation.
Currently, all 130 manufacturers are at the Listed or Records Reviewed tier. No manufacturer has reached IR Vetted Partner status because we have not yet begun outreach. This will change as manufacturers claim and review their profiles.
Certification Verification
When a manufacturer claims a certification, we check it against public databases when possible. Not all certifications have public registries. Here is what each status means:
| Status | What It Means | Example |
|---|---|---|
| Confirmed | Found in an independent public database with matching facility or company name | NSF GMP registration found in NSF public directory |
| Self-reported | Claimed by the manufacturer but not independently confirmed. This does not mean the claim is false. It means we could not find it in a public database. | Organic certification claimed on website, no USDA NOP record found |
| Searched, not found | We searched the relevant public database and did not find a matching record. Documented with search date and database checked. | “Not found in NSF public directory as of March 19, 2026” |
Current coverage: Of 300 total certification claims across 130 manufacturers, 25 (8.3%) are independently confirmed and 275 (91.7%) remain self-reported. We are transparent about how much we have confirmed and how much remains unverified.
Trust Is Built, Not Claimed
Our approach draws from the trust equation developed by David Maister, Charles Green, and Robert Galford in The Trusted Advisor:
Trust = (Credibility + Reliability + Intimacy) / Self-Orientation
Applied to our directory: Credibility means cited sources and confirmed certifications. Reliability means consistent method applied equally to every listing. Intimacy means understanding what a supplement brand founder actually needs to decide. And the denominator, Self-Orientation, is minimized by disclosing every financial relationship and publishing what we cannot assess.
The single most powerful trust signal is publishing your limitations. Anyone can claim expertise. Fewer organizations will tell you what they do not know.
What We Check by Category
Different service categories have different publicly checkable attributes. Here is what we can realistically assess for each:
Contract Manufacturers
What we check: FDA registration, cGMP status, third-party certifications (NSF, SQF, organic), facility location, stated capabilities and dosage forms, minimum order quantities
What we cannot check: Actual manufacturing quality, batch-to-batch consistency, ingredient sourcing practices, facility conditions, financial stability
Testing Labs
What we check: ISO 17025 accreditation, Amazon TIC approval, test method capabilities, turnaround times, location
What we cannot check: Accuracy of individual test results, lab personnel qualifications, inter-lab comparison performance
Ingredient Suppliers
What we check: Product catalog, stated certifications, sourcing claims, facility location
What we cannot check: Raw material purity, supply chain integrity, lot-to-lot variation, pricing
Packaging and Labeling
What we check: Service capabilities, FDA compliance claims, client references when publicly available, facility location
What we cannot check: Print quality, material durability, lead time reliability, pricing structures
What We Don't Do
- We are not a certification body. Our assessments are not certifications and should not be treated as such.
- We are not auditors. We do not conduct on-site inspections or audit manufacturing processes.
- We do not provide legal or regulatory advice. Our content is educational.
- We do not guarantee manufacturer quality, safety, or compliance. Our assessments are based on publicly available information and have inherent limitations.
- We do not use the word "verified" to describe our assessments. We use "assessed," a deliberate choice explained in our Terms of Service.
Dietary supplement manufacturers must comply with 21 CFR Part 111 (Current Good Manufacturing Practice for dietary supplements). This includes requirements for personnel, facilities, equipment, production, laboratory operations, and record-keeping.
See Our Method in Action
Browse assessed manufacturers and see how our six-gate framework applies to real listings.