Guide
cGMP vs. GMP Certified vs. NSF Certified for Sport vs. USP Verified: what do they mean?
By Jake, founder · Published · Updated
"cGMP" is the federal regulation every US dietary supplement manufacturer must follow, and there is no certificate for it. "GMP Certified" or "GMP Registered" (NSF/ANSI 455-2, the UL/NPA program, Eurofins) is a voluntary third-party audit of one facility against that regulation and more. NSF Certified for Sport and USP Verified test the finished product.
Four different things wearing similar-sounding names
These four labels get used interchangeably in supplement marketing, but they're not the same kind of claim. One is a law. Two are facility audits by a private company. Two are product-level tests. Knowing which is which matters because each is evidence of a different, narrower thing than "this product is safe" or "this company follows the rules."
| Label | What it is | Evidence of | Not evidence of |
|---|---|---|---|
| cGMP | 21 CFR Part 111: a federal regulation, not a certificate. | A legal requirement every US dietary supplement manufacturer must follow; FDA verifies it through inspection. | There is no third-party "cGMP certificate" to check. A company describing itself as cGMP compliant is making a legal claim about itself, not showing a document from a certifier. |
| "GMP Certified" / "GMP Registered" | A voluntary third-party audit of one facility against a private standard, for example NSF/ANSI 455-2, the UL/NPA program, or Eurofins' dietary supplement GMP program. | That an accredited certifier audited that specific facility's systems (quality management, production, documentation) on the date shown on the certificate. | Not a test of any individual product or lot, and not evidence for a facility the certificate doesn't name. A brand can use several manufacturers, only some of which may be certified. |
| NSF Certified for Sport | A product-level certification layered on top of facility GMP certification. | NSF states the product was tested against "290 substances banned by major athletic organizations," that label contents match what's in the product, and that the manufacturing facility is GMP Certified and audited annually or bi-annually. | Not a general safety or efficacy certification: its scope is banned-substance screening and label accuracy for that specific product. |
| USP Verified | A product mark from USP, combining a facility audit with product testing. | USP states the process includes a facility audit against USP General Chapter <2750> and FDA cGMPs, review of quality control and manufacturing records, lab testing of samples against USP-NF standards, and ongoing off-the-shelf testing. | USP states the mark means what's on the label is what's in the bottle and that it's made under cGMPs. It does not claim to evaluate the product's efficacy for a health outcome. |
Each cell is drawn from that certifier's own current program page, fetched for this article; see Sources. Certification scope and requirements change; verify the current program terms with the certifier before relying on a specific product's mark.
cGMP: the regulation, not a badge
21 CFR Part 111 sets the current good manufacturing practice rules every firm that manufactures, packages, labels, or holds a dietary supplement in the US is required to follow. It applies by law, not by enrollment: there's no certificate to display and no renewal date, because FDA verifies compliance through inspection rather than issuing a credential. "cGMP compliant" on a label is a claim the company is making about itself.
"GMP Certified": a private audit of one facility
Several organizations run voluntary, paid, third-party audit programs that check whether a specific facility's systems actually implement Part 111 (and, in most of these programs, more than Part 111 requires). NSF/ANSI 455-2 is described by PJR, one of the accredited bodies certifying to it, as built "on FDA GMP requirements, ensuring your operations align with U.S. regulations," verified through "an on-site review of your facilities, processes, and documentation." UL, partnered with the Natural Products Association, offers a comparable program helping manufacturers "demonstrate conformance to ISO standards, the Code of Federal Regulations (CFR) and regional requirements through GMP certification." Eurofins' program covers "21 CFR 111/117 and NSF/ANSI 455-2-2024," auditing six areas (quality system, facilities and equipment, material and supplier management, production system, packaging system, and laboratory system) as a process certification of the facility, not of individual products.
The common thread: all three certify a facility's systems, on the date of the audit, by an outside party. None of them is a test of a specific product or lot. That's what a Certificate of Analysis is for, and it's a separate document from a facility's GMP certificate.
NSF Certified for Sport and USP Verified: the product itself
Both of these go a step further and test the finished product, not only the facility that made it. NSF Certified for Sport screens the product against what NSF describes as more than 290 substances banned by major sporting organizations, confirms the label matches what's actually in the product, and requires the manufacturing facility already hold GMP certification. The athlete-focused certification is built on top of the facility one, not instead of it.
USP's Dietary Supplement Verification Program combines a facility audit, against USP General Chapter <2750> and FDA cGMPs, with laboratory testing of product samples against USP-NF quality standards, plus ongoing off-the-shelf testing after the initial verification. USP states its mark means "what's on the label is what's in the bottle," which is a claim about accurate labeling and manufacturing practice, not a claim about whether the product treats or prevents anything.
What this means for a document review
None of these four labels stands in for the others, and a reviewer checking a brand's paperwork is usually asking for a specific one of them: a cGMP certificate for the facility, or a Certificate of Analysis for the product, not a marketing claim that sounds like either. Filing the right document under the right name is the difference; see how to organize compliance documents by lot for where a cGMP certificate and a COA each belong. The free check shows which of these documents you already have on file for each SKU.
- cGMP compliance is required by law and verified by FDA inspection, not a certificate.
- A facility-level "GMP Certified" mark names one facility and one audit date; it doesn't cover a different manufacturer or an untested lot.
- NSF Certified for Sport and USP Verified both test the finished product, for different things: banned substances and label accuracy, versus label accuracy and USP quality standards.
Related: what your contract manufacturer is responsible for, how to read a Certificate of Analysis, and the FDA Part 111 requirements library.
Sources
- 21 CFR 111.1, Who is subject to this part? (Cornell Law mirror of eCFR) accessed 2026-08-17
- PJR, NSF/ANSI 455-2: Dietary Supplements GMP Certification (accredited certification body's program page; nsf.org's own page blocked automated access) accessed 2026-08-17
- UL Solutions, Supplier Quality Audits and Certifications accessed 2026-08-17
- Eurofins, Dietary and Food Supplements GMP Certification accessed 2026-08-17
- NSF Certified for Sport, What Our Mark Means accessed 2026-08-17
- USP, Dietary Supplements Verification Program accessed 2026-08-17
Frequently asked questions
- Is "cGMP compliant" the same as "GMP Certified"?
- No. cGMP compliance is a legal requirement under 21 CFR Part 111 that every US manufacturer must meet, verified by FDA inspection rather than by a certificate. "GMP Certified" or "GMP Registered" means a private certifier (NSF, UL/NPA, Eurofins, or others) separately audited that specific facility against a standard and issued a certificate with a date on it.
- Does a GMP-certified facility mean every product from it is tested?
- No. Facility GMP certification (for example NSF/ANSI 455-2) audits the facility's systems (quality management, production processes, documentation) on the date of the audit. It is not a per-product or per-lot test result; that is what a Certificate of Analysis is for.
- What does NSF Certified for Sport add that plain GMP certification doesn't?
- NSF Certified for Sport tests the finished product against a list the certifier describes as over 290 substances banned by major sporting organizations, confirms label contents match what's in the product, and requires the manufacturing facility already be GMP Certified. It's a product-level certification layered on top of a facility-level one.
- What does USP Verified confirm that GMP certification doesn't?
- USP Verified combines a facility audit against USP General Chapter <2750> and FDA cGMPs with laboratory testing of product samples against USP-NF quality standards and ongoing off-the-shelf testing, to confirm the label matches the bottle and the product breaks down as expected. It is a product mark, not only a facility one.
- Do I need any of these to sell on Amazon or to a retailer?
- This article doesn't answer that for a specific SKU. Check the retailer's or Amazon's own current requirements, since none of these certifications is a substitute for what a document review or TIC verification separately asks for.