A Certificate of Analysis, commonly called a COA, is a document that reports test results for a material or finished product. In the supplement industry, a COA can help connect a batch to specifications for identity, strength, purity or contaminants—but it must be read carefully.
A certificate is not automatically proof that a product is effective, safe for every person or approved by the FDA.
What information should a COA identify?
A useful COA normally provides enough information to understand what was tested and which batch the results represent. Look for:
- Product or material name
- Lot or batch number
- Date received and date tested
- Test or report number
- Laboratory name and contact information
- Tests performed and methods used
- Specifications or acceptance limits
- Measured results
- Pass/fail conclusion where applicable
- Authorized signature or electronic approval
The batch number on the certificate should match the batch printed on the product when the document is presented as a finished-product COA.
Raw-material COA vs finished-product COA
A raw-material certificate applies to an ingredient before manufacturing. A finished-product certificate applies to the completed batch. Both can be useful, but they answer different questions.
A raw shilajit ingredient report, for example, does not automatically prove that every finished gummy or capsule made with it meets the same specifications. Manufacturing, other ingredients and batch handling also matter.
Common categories of testing
Identity
Identity testing asks whether the ingredient is what the label says it is. The appropriate method depends on the material. Botanical identity may involve physical, chemical or chromatographic methods.
Potency or strength
These results compare measured amounts with label or manufacturing specifications. Not every botanical has one simple marker that represents its overall quality.
Heavy metals
Reports may include lead, arsenic, cadmium and mercury. A result should include a numerical value, unit and specification. “Pass” without the underlying limit provides less context.
Microbiology
Testing may include total microbial counts and specified organisms such as Salmonella, E. coli, yeast or mold, depending on the product and risk assessment.
Other tests
Depending on the ingredient, testing may address pesticides, residual solvents, allergens, mycotoxins, moisture or stability. Not every product requires the same test panel.
How to read the units
Results can be reported as parts per million, parts per billion, milligrams per kilogram or other units. These cannot be compared reliably until the units and sample basis are understood. “Not detected” usually means below the method's detection limit; it does not necessarily mean absolute zero.
Does “third-party tested” mean certified?
Not necessarily. Third-party testing generally means a laboratory separate from the seller or manufacturer performed a test. Certification is a separate process with its own program, scope and verification rules. A brand should identify the certification program rather than display an unexplained badge.
What a COA cannot prove
- That a supplement treats a disease
- That every future batch will be identical
- That the product is appropriate for every user
- That a study on one preparation applies to this product
- That the FDA approved the product
- That every relevant risk was tested
COA red flags
- The batch number does not match the product.
- The laboratory name is hidden without explanation.
- The report has no test dates.
- Only “pass” appears, with no method, result or specification.
- The document is edited, cropped or difficult to authenticate.
- One certificate is used to represent unrelated products or batches.
- Marketing describes tests that do not appear on the report.
Questions to ask a supplement company
- Is this document for the raw ingredient or finished product?
- Which batch does it cover?
- Which tests were performed?
- Was the laboratory independent from the manufacturer?
- Can the laboratory or report number be verified?
- Why were these specifications selected?
Customers requesting available Himiyer label or batch documentation can follow the instructions on our Supplement Quality & Transparency page. Include the exact product name and lot number.
For broader regulatory context, review the FDA's Dietary Supplements 101.
