Why a COA for Raw Materials Is Only the Starting Point

A COA normally focuses on a specific batch and reports selected test items, specifications, and results.

For example, a botanical extract COA may include:

• Appearance
• Identification
• Assay or active compounds
• Moisture or loss on drying
• Heavy metals
• Microbiological limits
• Batch number
• Manufacturing date
• Expiration or retest date

These are important, but they may not cover every requirement of a customer’s raw material specification.

For dietary supplement manufacturers, quality systems also need to address the identity, purity, strength, composition, and contamination limits of components used in manufacturing. FDA’s dietary supplement CGMP framework specifically addresses these types of specifications.

That is why a visually complete COA should not automatically be treated as a complete qualification package.

1. Check the Raw Material Specification

Before reviewing individual batch results, confirm that the supplier has a clear product specification.

A specification should define the characteristics that matter for the intended application, which may include:

• Product identity
• Assay or active content
• Physical characteristics
• Particle size
• Moisture
• Microbiological limits
• Heavy metals
• Other contaminants relevant to the ingredient
• Packaging and storage requirements

The exact testing requirements should be based on the ingredient and intended use rather than copied from a generic template.

For example, the critical parameters for a botanical extract may be different from those for an amino acid, probiotic, vitamin, or functional blend.

The key question is:

Does the supplier’s specification match the parameters your quality team actually needs to control?

2. Review the COA for Raw Materials at Batch Level

Once the product specification is established, review the actual batch COA.

The COA should allow your team to connect the test results to a specific batch.

Look for information such as:

• Product name
• Batch or lot number
• Manufacturing date
• Expiration or retest date
• Specification
• Actual result
• Testing or analysis date, where applicable
• Authorized approval

Batch traceability is particularly important when raw materials are used in regulated food or supplement manufacturing.

A passing sample is useful for initial evaluation, but it does not replace batch-level verification.

3. Ask How the Critical Parameters Are Tested

A common weakness in supplier documentation is that the specification is listed but the testing approach is unclear.

For critical parameters, quality teams may need to understand:

• What analytical method is used?
• Is the method an established compendial method or an internal method?
• Is the result quantitative or simply reported as pass/fail?
• Is testing performed on every batch or periodically?
• Is the test performed by the manufacturer or an external laboratory?

The appropriate level of detail depends on the ingredient and the customer’s quality system.

The objective is not to demand unnecessary paperwork.

The objective is to make sure that a reported result is meaningful, reproducible, and appropriate for the parameter being controlled.

4. Don’t Forget the SDS and Other Safety Documentation

A COA answers a quality question. It does not replace safety documentation.

For products covered by applicable workplace hazard communication requirements, a Safety Data Sheet provides information about hazards, handling, storage, emergency measures, and other relevant safety information. OSHA’s Hazard Communication Standard specifies required SDS information and structure for covered hazardous chemicals.

For this reason, a supplier qualification package may need to include both:

Quality documentation

• COA
• Product specification
• Testing information
• Batch traceability

Safety documentation

• SDS
• Handling and storage information
• Applicable hazard classification

Not every food ingredient will require the same documentation, so the document package should be matched to the actual material and market.

5. Verify Certifications and Market-Specific Documents

Quality approval often goes beyond analytical specifications.

Depending on the customer and target market, additional documentation may be requested, such as:

• Halal
• Kosher
• Non-GMO documentation
• Organic certification
• Allergen statement
• BSE/TSE statement
• Irradiation statement
• Residual solvent statement
• Pesticide or herbicide testing
• Country-of-origin information
• Quality-system certificates

These should not be treated as a universal checklist for every ingredient.

The correct question is:

Which documents are actually required for this ingredient, customer, application, and target market?

For example, the U.S. National Bioengineered Food Disclosure Standard is a specific regulatory framework concerning bioengineered food disclosure. It should not simply be equated with a blanket “Non-GMO certification” requirement. USDA also states that the absence of a required bioengineered disclosure does not by itself establish a Non-GMO claim.

That distinction matters when building a defensible supplier documentation package.

6. Make Traceability Part of the Approval Process

A quality document is much more useful when it can be connected to a physical batch.

At minimum, your purchasing and quality records should allow you to connect:

Supplier → Product → Batch → COA → Shipment → Your receiving records

This becomes especially important when investigating deviations, customer complaints, or potential recalls.

EU food law, for example, defines traceability as the ability to track food and substances intended to be incorporated into food through relevant stages of production, processing, and distribution.

For suppliers serving international customers, clear batch identification and documentation can therefore be an important part of supplier qualification.

7. Separate Raw Material Approval From Finished Product Registration

This distinction is often misunderstood.

A supplier can provide documentation for the raw material without being responsible for the regulatory registration or approval of the customer’s finished product.

For example, a supplier may provide:

• COA
• Specification
• SDS
• Batch information
• Relevant testing reports
• Certification documents
• Product statements

But the finished supplement or food product may have separate regulatory, labeling, notification, or registration requirements depending on the market and product category.

These are different responsibilities.

A good raw material supplier should therefore be clear about what it can document and what remains the responsibility of the finished-product manufacturer or brand owner.