21 CFR Part 111 cGMP: master manufacturing and batch records

For US supplement manufacturers, there is one regulation that governs how products must actually be made: 21 CFR Part 111. It is the current good manufacturing practice rule for dietary supplements, and it is where FDA inspections focus. At its heart are two documents that many manufacturers underestimate — the master manufacturing record and the batch production record.

What 21 CFR Part 111 is

Part 111 sets out the current good manufacturing practice (cGMP) requirements for dietary supplements: how they must be manufactured, packaged, labeled, and held. It covers personnel, facilities, equipment, production and process controls, quality control, records, and more.

Unlike the question of which ingredients or claims are allowed, Part 111 is about the integrity of the process — ensuring that what you intended to make is what you actually made, consistently, batch after batch.

The master manufacturing record

A cornerstone of Part 111 is the master manufacturing record (MMR) — the master recipe and method for a product. The MMR specifies the complete composition, the procedures, the controls, and the specifications for making one batch of a defined size. It is the definitive document that says exactly how the product is to be produced.

Every batch of a product is made to its MMR. If the MMR is wrong, incomplete, or out of date, every batch made from it inherits the problem.

The batch production record

Where the MMR is the plan, the batch production record (BPR) is the proof. For each batch actually produced, the BPR records what was done — the ingredients and amounts used, the steps followed, the checks performed, the results — demonstrating that the batch was made according to the MMR.

Together they form the spine of cGMP documentation: the MMR defines the standard, the BPR evidences that each batch met it. An inspector will ask for both.

Why these records trip manufacturers up

The MMR has to be complete, accurate, and current — and it has to stay consistent with the actual formula. When the formula lives in one place (a spreadsheet, someone's knowledge) and the MMR is a separately maintained document, they drift. A dose changes in the formula but not the MMR; an ingredient is swapped but the master record still names the old one.

That drift is exactly what cGMP is designed to prevent, and exactly what manual, disconnected documentation tends to produce.

Identity, specifications, and testing

Part 111 also requires establishing specifications and verifying them — including confirming the identity of incoming ingredients and testing to ensure the product meets its specifications. The specifications behind this are, again, downstream of the formula: they describe what the product and its components should be.

Because Part 111 is detailed and enforced through inspection, confirm the current requirements and how they apply to your operation rather than relying on a general summary.

The version-control connection

Underlying all of this is version control. A product evolves; its MMR must evolve with it, with a clear record of which version is current and what changed. Without that, you cannot reliably reproduce a batch, answer an audit, or even be sure which recipe is authoritative. cGMP is, in large part, a discipline of controlled, traceable documentation.

Generating the records from the formula

The robust approach is to derive the manufacturing records from the structured formula, under version control, so the MMR reflects the current product by construction and each batch record is built against the right master. When the formula is the single source of truth, the master record and the specifications it carries stay consistent with what is actually being made — and a full history is preserved.

The takeaway

21 CFR Part 111 governs how US supplements must be made, and its master manufacturing record and batch production record are the documents at its core. Their reliability depends on staying consistent with the formula and under proper version control. Deriving them from a single, structured source of truth is what turns cGMP documentation from a drift-prone chore into a controlled, audit-ready process.

Lemoniq holds every product under version control with a full audit trail, so the master record and specifications behind your cGMP documentation stay consistent with the current formula and reproducible batch to batch. We solve this exact problem. See how it works