21 CFR Part 111: What a Supplier's COA Can and Can't Prove

21 CFR Part 111 is the part of Title 21 of the CFR that sets GMP for anyone who manufactures, packages, labels or holds a dietary supplement. That includes foreign firms whose products are imported into the United States. Conventional food falls under Part 117 and finished drugs under Part 211, so a supplement follows Part 111.

The rule has 16 subparts, A to P. Four matter most at receiving:

• Subpart E sets production and process controls, including the specification rules in §111.70 to §111.75.
• Subpart H covers the master manufacturing record (MMR), the written recipe and controls for each formulation and batch size.
• Subpart I covers the batch production record (BPR), the record of what happened each time a batch was made.
• Subpart P covers recordkeeping.

The rule has applied to firms of every size since June 25, 2010.

No. FDA's guidance for small businesses states that the original manufacturer remains responsible for ensuring the packaged product meets specifications and for approving its release, even when contractors perform operations. A distributor that controls the product is responsible for its compliance as well.

A firm that only packages or labels a product it receives is still covered. Section 111.70(f) requires specifications that give sufficient assurance the received product is adequately identified and consistent with the purchase order, and FDA cited that clause in an April 7, 2026 letter to Nature's Elements.

Our recommendation is to settle four points in a written quality agreement before the first batch:

• You write the specifications.
• The agreement names who runs the identity test on each lot.
• It names who holds the MMR and BPR.
• It states how you receive copies for each lot you release.

No. Section 111.75(a)(1)(i) requires the manufacturer to conduct "at least one appropriate test or examination to verify the identity of any component that is a dietary ingredient." A dietary ingredient is the vitamin, mineral, amino acid, herb or similar substance that gives the supplement its purpose. A component is any substance used in making the supplement.

The only way around the test is a petition to FDA under §111.75(a)(1)(ii), and the petition must be granted before you rely on it. FDA restates both points in its May 2026 letter to Meta Labs.

The rule requires the determination before each component is used, so testing a supplier once at approval does not satisfy it. In practice that means every lot received.

A COA still has a job. For other component specifications, §111.75(a)(2)(ii) lets you rely on a supplier's certificate only when all five conditions hold:

1. You first qualified the supplier by confirming its results with your own tests.
2. The COA describes the test methods and the actual results.
3. You keep documentation of how you qualified the supplier.
4. You re-confirm the certificate's reliability periodically.
5. Quality control personnel review and approve the basis for qualification.

The Meta Labs letter describes the certificate route as available for "components other than dietary ingredients." Where a dietary ingredient's purity or strength is critical, our recommendation is to test it yourself on every lot and treat the supplier's certificate as supporting evidence.

A GMP certificate on the supplier's site does not change this. A WHO GMP certificate proves a facility's quality system, not that the lot in your warehouse is the right material.

For each lot, a supplier can give you documents and a sample, and you must hold your own test results and records. The table below sets out each Part 111 requirement, whether supplier paperwork alone can satisfy it, and what the file should contain. Rules are as of October 2026.

A finished-product specification that is never tested against, for the batches your sampling plan covers, counts as a gap.

Five of the six letters cited a missing finished-product specification, five cited missing master manufacturing records and five cited missing batch production records. Component specifications appeared in three letters, and the clause requiring firms to determine whether specifications are met appeared in four.

The six letters are those returned by our October 2026 searches of FDA's warning-letter pages for Part 111 citations, dated November 2024 to May 2026. We did not tally every dietary supplement GMP letter FDA issued in that period, so the counts describe these six only. Each letter was read for the Part 111 sections it cites.

Section 111.70 appears in all six letters, in its finished-product, component or received-product form. Other sections each appeared in at most two letters:

• Quality control procedures, §111.103 (Time Challenger, Western Innovations).
• Returned-product procedures, Subpart N (Nupack, Western Innovations).
• Documentation of material review and disposition, §111.140 (Eniva).
• Laboratory reference-material criteria, §111.315(d) (Meta Labs).
• Received-product specifications, §111.70(f) and §111.75(e) (Nature's Elements).

Ask any ingredient supplier for eight things, each of which you can pass or fail. Our guide to qualifying a nutraceutical raw material supplier covers the wider vendor review. This list covers the Part 111 evidence.

1. Lot-specific COA with named methods. Pass: every test lists the method, the limit and the actual result. Fail: "complies" with no numbers.
2. A written specification that names an identity test. Pass: the identity method is stated. Fail: appearance only.
3. An evaluation sample. Pass: you run your identity test on the sample and the result matches your specification before you place a commercial order. Fail: any unexplained mismatch.
4. Qualification data you confirm yourself. Pass: your own results on the lots you define in your procedure fall within the limits on the supplier's COA. Fail: a COA relied on without your own confirmation.
5. Re-confirmation schedule. Pass: a written interval exists, with a named person who reviews it.
6. Named manufacturing site and origin. Pass: the site on the COA, the quotation and the purchase order match.
7. Change notification in writing. Pass: the supplier agrees to notify you of process, site or source changes before shipping.
8. Lot traceability. Pass: the lot number on the container, the COA and your receiving record are identical.

We send the documents you need to build the file and the sample you need to test. We are an India-based supplier of pharmaceutical APIs and raw materials, including nutraceutical and supplement raw materials, and we support documentation and supply for US importers. Part 111 places the identity test with the manufacturer that uses the ingredient, so you run it on the sample.

Our buying route runs from inquiry to feasibility review, commercial quotation, production and quality control, packaging and dispatch. For supplement buyers the working steps are:

• We support sample and evaluation quantities for qualified business buyers, subject to the specific material and availability. Run your identity test on the sample against your written specification (item 3 on the list above).
• The documents we supply are the COA, specifications and SDS/MSDS (safety data sheet) where applicable, which map to items 1 and 2. Ask for the rest of the list in your inquiry and we will confirm what we can provide for the specific material.
• MOQ (minimum order quantity) and lead time are confirmed material by material at quotation, after we check stock, schedule, quality release and documentation. Standard payment for international commercial orders is generally 100% advance by bank transfer unless alternative terms are agreed in writing.
• Pricing depends on the material and current market conditions, so we quote per request. There is no single price range.

A request moves fastest with the material name and its CAS number (the Chemical Abstracts Service registry number), quantity, destination, grade or purity, the documents you need, payment terms and Incoterms (the standard terms that set who handles shipping and risk). For a wider comparison of sourcing routes, see our guide to nutraceutical ingredient suppliers.