FDA 483 Citations for Dietary Ingredient Identity Testing Under 21 CFR 111.75(a)(1)

23 hours ago

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"You did not conduct at least one appropriate test or examination to verify the identity of a dietary ingredient, prior to its use." FDA investigators cited 21 CFR 111.75(a)(1)(i) with that wording 66 times on system-generated Form FDA 483s in fiscal year 2025.

This is one of the clearest rules in Part 111. For components that are dietary ingredients, a supplier's certificate of analysis is not enough to confirm identity. The manufacturer must test or examine every lot before use. Two related observations show where firms fall short on methods:

"You did not identify and use an appropriate scientifically valid method for each established specification for which testing or examination is required ...," 111.320(b), 20 times
"You did not ensure that the tests or examinations that you used to determine whether the specifications are met are appropriate, scientifically valid methods," 111.75(h), 20 times

What the citations mean

Examples written after "Specifically" usually describe:

Dietary ingredients released on the supplier's certificate of analysis alone
Identity confirmed by checking the label on the drum
Organoleptic examination (look, smell, taste) used for ingredients where it cannot distinguish adulterants
Identity tests that are not specific, such as a general assay that many substances pass
FTIR or NIR used without a validated reference library or with no acceptance criteria
Botanical identity tested on extracts with methods suited only to raw plant material
No identity testing on some lots received between scheduled tests

What Part 111 requires

Identity testing (111.75(a)(1)). Before you use a component, you must conduct at least one appropriate test or examination to verify the identity of any component that is a dietary ingredient. You may petition FDA under 111.75(a)(1)(ii) to be exempt from this requirement, but you must show, through appropriate data and information, that less than 100 percent identity testing will not materially diminish assurance of the identity of the dietary ingredient. The exemption applies only if FDA grants the petition.

Other components (111.75(a)(2)). For components that are not dietary ingredients, and for specifications other than identity, you may rely on a certificate of analysis from a qualified supplier, as long as you also confirm the identity of the component.

Scientifically valid methods (111.75(h) and 111.320). Tests and examinations must use appropriate, scientifically valid methods, which can include gross organoleptic analysis, macroscopic analysis, microscopic analysis, chemical analysis or other scientifically valid methods. Laboratory operations must identify and use an appropriate method for each specification.

How to respond to the 483

Part 111 does not set a deadline for responding, but most firms respond in writing within 15 business days of the close of the inspection, so FDA has the response before it decides on further action.

Test what is in inventory

Test every lot of dietary ingredient in inventory before further use. Quarantine untested lots.

Assess product already made

Test reserve samples of components or finished batches where possible. Where identity cannot be confirmed for product in distribution, assess the risk and whether a recall is needed.

Choose methods that fit each ingredient

For each dietary ingredient, select a method that is specific enough to confirm identity and, where relevant, detect common adulterants or substitutes. Examples include:

HPTLC or HPLC fingerprinting against a reference standard for botanicals
Microscopic and macroscopic examination for raw botanical materials
FTIR or NIR with a validated spectral library for single-compound ingredients
Compendial identity tests where a monograph exists

Document why each method is scientifically valid for that ingredient and form, and the acceptance criteria.

Fix the system

Receiving and quarantine controls that block use until identity is confirmed
A testing plan listing each dietary ingredient and its identity method
Qualification of contract laboratories and method verification
Out-of-specification handling and quality control review

What a compliant identity testing program contains

List of dietary ingredients and their identity methods
Method rationale and validation or verification
Reference standards and their control
Sampling plans for incoming lots
Quarantine and release by quality control
Contract laboratory qualification
Records of every test and decision

Common mistakes in identity testing responses

Switching to a supplier "identity certificate" instead of testing
Using one generic method for every ingredient
Testing raw botanicals and extracts with the same method without checking suitability
Forgetting lots received from secondary suppliers
Testing going forward without assessing product already made

Example: how one response section might read

This illustrates structure only; your response must describe your own products and facts.

Observation 3: You did not conduct at least one appropriate test or examination to verify the identity of a dietary ingredient prior to its use. Specifically, ashwagandha root extract was released based on the supplier's certificate of analysis.

Response:

Correction: The three lots in inventory were tested by HPTLC against a reference standard on stated dates and confirmed.
Product assessment: Reserve samples of finished batches made with earlier lots were tested by the same method and were consistent with the reference.
Corrective action: A dietary ingredient identity testing plan was issued listing each of the 38 dietary ingredients, its method and acceptance criteria. The inventory system now blocks release until quality control records the identity result.
Method assurance: The contract laboratory's methods were reviewed for suitability to each ingredient form, and two methods were replaced.

Frequently asked questions

Can we rely on the supplier's certificate of analysis for identity?

Not for dietary ingredients. You must conduct at least one appropriate test or examination yourself, or through a laboratory you engage, unless FDA has granted an exemption petition.

Is organoleptic testing acceptable?

It can be a scientifically valid method for some ingredients, but often it cannot distinguish an ingredient from a substitute. Document why it is adequate if you use it.

Do we need to test every lot?

Yes, every lot of a dietary ingredient before use, unless FDA grants an exemption.

How A.P. Lyon documents help

A.P. Lyon's Dietary Supplement cGMP Quality System (21 CFR 111) includes procedures and forms for identity testing, receiving and quarantine, laboratory operations and method qualification. Brand owners can use the Supplement Brand Owner Compliance Pack to verify that their contract manufacturers test identity.

Documents are editable Word and Excel files and must be adapted to your ingredients and operations. Method selection requires qualified laboratory judgment.

Next steps

Test every dietary ingredient lot in inventory
Assess finished product made from untested lots
Assign a scientifically valid identity method to each ingredient
Respond in writing within 15 business days with dates for each action

To compare the complete system with the brand owner pack, see all dietary supplement documents.

Not sure where your quality system stands? Take the free QMS gap check: about 20 questions, an instant report of your gaps by clause, and the procedures that close each one.