21 CFR 111.205 requires dietary supplement manufacturers to establish a master manufacturing record (MMR) for each unique formulation and batch size of a dietary supplement. The MMR is the foundational document that describes how a product is to be manufactured — the formula, the manufacturing steps, the in-process controls, the specifications, and the finished product testing requirements.

What Must Be in the MMR

Under 21 CFR 111.210, the master manufacturing record must include:

1. Product Identification

• The name of the dietary supplement and the dosage form (capsule, tablet, softgel, powder, liquid)

• The intended batch size

2. List of Components

• All components used in the manufacture of the product, listed by their name or code, quantity per batch, and a reference to their specifications

• Must include all active dietary ingredients and all excipients (fillers, binders, lubricants, coatings, flavors, colorants)

3. Composition and Formula

• The quantitative statement of each component per unit serving (e.g., per capsule) and per batch

• The theoretical batch yield (how many units at 100% yield)

• Any overages built into the formula (e.g., to account for processing losses)

4. Manufacturing Instructions

• Step-by-step instructions for manufacturing the batch

• Equipment to be used (or type of equipment)

• Critical process parameters (e.g., blending time and speed, granulation conditions, drying temperature and time, encapsulation fill weight range)

• In-process control points and their specifications (blend uniformity, fill weight checks, hardness)

5. Packaging and Labeling Instructions

• Specifications for packaging components (container type, closure, desiccant)

• Label and labeling to be used, including instructions for label application

• Any special conditions for packaging (e.g., nitrogen flush, controlled humidity)

6. Specifications

• Identity, purity, strength, and composition specifications for the finished product

• Contaminant limits (heavy metals, microbial, pesticides as applicable)

• Stability data supporting the product's expiration date

7. Sampling and Testing Plan

• Instructions for sampling the finished batch

• Tests to be conducted and acceptance criteria

• Any required in-process testing and its acceptance criteria

MMR vs. Batch Production Record (BPR)

The MMR and the batch production record (BPR) are related but distinct:

Under 21 CFR 111.255, the BPR must be prepared for each batch and must be a copy of (or derived from) the MMR, with spaces for actual quantities, dates, and personnel signatures filled in during production.

MMR Approval and Version Control

The MMR must be:

• Approved by a qualified individual before use — the original and any revision must bear a signature and date of approval

• Version controlled — when changes are made to a formula or process, a new version must be created and approved

• Archived — superseded versions must be retained to reconstruct the history of how products were made over time

Unauthorized changes to formulas (changing a component, adjusting a quantity, modifying a process step) without going through the formal MMR revision process are a cGMP violation. This is a common finding when a manufacturer makes a practical adjustment during production without updating the MMR.

Batch Size Specificity

A separate MMR is required for each unique batch size — a half-batch cannot simply use the full-batch MMR with quantities divided in half unless there is a validated scaling procedure and a separate MMR or addendum for the scaled batch size.

Overages in the Formula

The MMR may include overages — additional amounts of dietary ingredients added to account for:

• Losses during processing (granulation, blending, encapsulation)

• Degradation during shelf life (nutrients that degrade over time, requiring higher initial levels to ensure label claim through expiration)

Overages must be documented in the MMR, and the basis for the overage must be supported by data (processing yield studies, stability data). Undisclosed overages — adding extra ingredient without documenting it — can create potency labeling mismatches and is not compliant.

Contract Manufacturing Considerations

When a brand uses a contract manufacturer (CM), the MMR responsibility is shared:

• The CM typically holds and maintains the MMR for products it manufactures

• The brand should obtain and review the MMR to ensure the formula and process instructions align with the brand's product specifications

• The brand remains responsible for verifying that the CM's MMR is compliant and that finished product meets specifications

• If the brand owns the formula, it should retain a copy of the MMR as part of its quality system

Brands that cannot produce their MMR (because it "belongs to the CM") face audit and regulatory vulnerabilities.

How Truli Helps with MMR Compliance

• MMR completeness review: Truli evaluates whether existing MMRs include all required components — formula, manufacturing instructions, specifications, sampling plan, and packaging/labeling instructions

• Version control documentation: Truli identifies whether MMR version history is maintained and whether changes go through an approval process

• Formula vs. label claim reconciliation: Truli cross-references MMR formula quantities against Supplement Facts panel declared values to identify discrepancies between what the MMR specifies and what the label claims

• Overage documentation review: Truli verifies that formula overages are documented in the MMR with a supporting basis

Related Regulations

• 21 CFR Part 111 — Supplement cGMP — Full cGMP framework for dietary supplements

• 21 CFR 111 Component Testing — Component specifications and testing that feed into the MMR

• 21 CFR 111 Product Complaints — How complaints may trigger MMR review and revision

• 21 CFR 101.36 — Supplement Facts Panel — Label declarations that must align with MMR formula quantities

Frequently Asked Questions

We make our product in 3 batch sizes. Do we need 3 separate MMRs?
Yes — or a single MMR with validated, documented scaling parameters for each batch size. The key requirement is that manufacturing instructions and specifications must be appropriate for the batch size being produced. A simple "divide by 2" is not an adequate scaling instruction unless there is documented validation showing that the half-batch process produces product that meets all specifications.

Our contract manufacturer says the formula is proprietary and won't share the MMR. Is that acceptable?
No — as the brand responsible for the product's compliance, you must have access to the MMR. FDA expects the brand to be able to produce the MMR during an inspection. If your contract manufacturer will not share the MMR, you have an unresolved compliance gap. Most contract manufacturers will share the MMR under a confidentiality agreement; refusal to do so is a red flag about the manufacturer's quality practices.

Does the MMR need to be electronic, or can it be paper?
Either is acceptable under 21 CFR Part 111. If electronic, the system must be able to generate accurate reproductions for FDA review and must include controls that prevent unauthorized changes (audit trail, access controls). Paper MMRs must be legible and stored in a controlled manner.

A note from Truli: Truli is not a law firm, and this article does not constitute or contain legal advice or create an attorney-client relationship. When determining your obligations and compliance with respect to relevant laws and regulations, you should consult a licensed attorney.

Last updated: April 2026. Reflects 21 CFR 111.205–111.210 as of April 2026. Book a demo to see how Truli monitors supplement cGMP compliance.