A Certificate of Analysis is the single most important document in your supply chain — and most brand owners file it without reading it. That’s a mistake. The CoA is where a manufacturer either proves your product is what the label says, or quietly reveals that it isn’t. Learning to read one like a quality director is the cheapest insurance your brand can buy.
Here’s how to read a supplement CoA the way a QA professional does — what each section means, and the red flags that should stop a shipment.
A Certificate of Analysis (CoA) is a document that reports the test results for a specific batch of product or raw material. It confirms identity (it is what it claims to be), potency (the actives are present at the labeled amount), and purity (contaminants are below limits). A real CoA is batch-specific, dated, and tied to a lot number — not a generic marketing sheet.
If a CoA isn’t tied to the exact lot you received, it isn’t telling you anything about the product in your hands.
| Section | What to Confirm |
|---|---|
| Product & lot number | Matches the batch you actually received |
| Identity | The ingredient is verified by a valid method (e.g., HPLC, not just appearance) |
| Assay / potency | Actives meet the label claim, with the test method named |
| Heavy metals | Lead, arsenic, cadmium, mercury below defined limits |
| Microbials | Total counts, yeast/mold, and pathogens (E. coli, Salmonella) within spec |
| Specifications & results | Each result sits inside a stated acceptance range |
A pro doesn’t skim for a pass/fail stamp. They check three things:
The FDA holds the brand owner responsible for what ships under your name. If a contaminated or underdosed batch reaches the market, the enforcement action lands on your brand — not just the factory. The CoA is your documented proof that you verified the product before it shipped. A manufacturer who provides clear, complete, batch-specific CoAs is handing you that protection. One who resists is handing you the risk.
A batch-specific CoA should include the product and lot number, identity confirmation by a valid method, potency/assay results against the label claim, heavy metals, microbial testing, and stated acceptance ranges with actual numerical results.
No. A raw-material CoA verifies an ingredient, not your finished product. Finished-batch testing is what proves the product you’re selling meets its label — and that’s what protects your brand.
The brand owner. The FDA places responsibility for label accuracy and safety on the firm marketing the product, so reviewing and retaining CoAs is part of protecting your own brand.
Want a manufacturer that proves quality on paper? UniWell Labs provides clear, batch-specific CoAs and full documentation so brand owners can verify every lot. Talk to our team about your quality requirements.