If you source regenerative biologics, the most important document in your file isn't the invoice — it's the Certificate of Analysis (COA). It's how you know what's actually in the vial, that the lot was tested, and that you can defend your sourcing if anyone ever asks. Yet plenty of clinics file the COA without reading it. This guide walks through what a good exosome or biologics certificate of analysis should contain, and the red flags that should stop a purchase. For licensed professional use only.
Why the COA is the document that matters
A COA is the manufacturer's lot-specific test record. It ties a physical vial on your shelf to the testing performed on that production lot. Without it, you're taking the supplier's word; with it, you have traceable documentation — which is exactly what a regulated, evolving space rewards.
What a complete COA should contain
- Lot / batch number. It must match the vial in your hand. This is the anchor for everything else.
- Product identity & characterization. What the product is, described in specific, testable terms — not just a marketing name.
- Sterility & endotoxin testing. Results, and the methods used, for sterility and bacterial endotoxin. Non-negotiable for an injectable-grade product.
- Relevant quantitative measures. Depending on the product, this can include particle or cell count and viability where applicable.
- Manufacture and expiry dates. When the lot was made and how long it's good for under specified storage.
- Release statement / specification. A clear pass against defined acceptance criteria, signed off by the manufacturer.
Red flags on a COA
- No lot traceability. A generic certificate that isn't tied to your specific lot number tells you nothing about your vial.
- Missing sterility or endotoxin results. For anything injectable-grade, absence here is a hard stop.
- Vague identity. A product described only by a brand name, with no characterization, can't be verified.
- “Available on request” — that never arrives. A supplier who can't promptly produce the COA for a lot you already own is answering the question for you.
COA + chain of custody + accreditation = a defensible file
The COA is one leg of a three-legged stool. Pair it with a documented chain of custody and accredited tissue sourcing (AATB for human-derived products), and your sourcing file holds up. Keep the boring paperwork complete on purpose — it's what separates a defensible program from a future problem.
Ask for the COA before you buy
The simplest vetting test costs nothing: ask a prospective supplier to send the COA for a current lot before you place an order. How quickly and completely they respond tells you most of what you need to know.
How to set up a wholesale account
If you'd like to see lot-level COA documentation alongside live wholesale pricing, the fastest path is to open an account. About two minutes, and you'll see clinic pricing instantly.
→ Apply for wholesale pricing: https://www.stemnovanetwork.com/apps/wpdapp
Questions before you apply? Reach the Stem Nova Network team at info@stemnovanetwork.com.
Related sourcing guides
- 7 Red Flags to Watch For When Sourcing Exosomes & Stem Cells
- Population Doubling: The UCT-MSC Quality Metric Most Clinics Have Never Asked About
- AATB Accreditation & Compliant Biologics Sourcing for Clinics (2026)
- Switching Biologics Suppliers: A Clinic's Checklist (2026)
Stem Nova Network supplies cGMP, COA-backed biologics for licensed medical professionals. Product information is provided for licensed professional use only and is not medical advice or a therapeutic claim.