Does Anyone Provide a Certificate of Analysis for Compounded GLP-1 Medication?
Does anyone provide a certificate of analysis for my batch?
Published September 2, 2026
Key takeaways
- Mazrek's compounded medication is tested by the dispensing pharmacy, and a certificate of analysis (COA) is available for your batch.
- A COA covers potency, sterility, endotoxin levels, and pH — not just 'the ingredient is present.'
- A COA is not the same thing as FDA approval. Compounded drugs aren't FDA-approved as finished products.
- If a provider won't say whether COAs exist or refuses to provide one on request, treat that as a red flag.
Mazrek
Physician-reviewed GLP-1 care
- State-licensed compounding pharmacy partner
- Certificate of analysis provided per batch
- Every prescription reviewed by a licensed provider
- Unlimited care team messaging
Prescription required. Treatment is only provided if clinically appropriate, as determined by a licensed provider.
What a certificate of analysis actually shows
A certificate of analysis is a lab document tied to a specific compounded batch — not a general claim about the pharmacy. For an injectable GLP-1 medication, a complete COA generally covers:
- Potency — confirms the active ingredient (semaglutide, tirzepatide, etc.) falls within an accepted range, typically plus or minus 10%, of the labeled concentration.
- Sterility — confirms the preparation is free of bacteria or other pathogens.
- Endotoxins — confirms bacterial endotoxin levels stay under the safety threshold defined in USP General Chapter 85.
- pH — confirms the solution's acid/base balance is within a range that minimizes irritation at the injection site.
These are the same categories of testing referenced in USP General Chapter 797, the national standard for sterile pharmaceutical compounding.
Why most telehealth GLP-1 sites don't mention this
Naming a pharmacy and offering batch-level testing documentation is a level of specificity a lot of GLP-1 storefronts skip — it's easier to make a general "quality tested" claim than to actually produce a document a patient (or a journalist, or a regulator) can check against a specific order. If a site can't tell you which pharmacy fills your prescription, it usually can't produce a COA either.
How to request yours
Ask your care team directly and reference your order number. A legitimate compounding pharmacy relationship should be able to connect a COA to the specific batch that filled your prescription — not just a generic testing statement about the pharmacy in general.
Frequently asked
What does a certificate of analysis actually test for?+
A COA from a compounding pharmacy typically covers four things: potency (the active ingredient is within an accepted range of the labeled concentration), sterility (no bacteria or other contaminants), endotoxin levels (bacterial byproducts kept under a safety threshold), and pH (to minimize injection site irritation).
Is a certificate of analysis the same as FDA approval?+
No. Compounded medications are not FDA-approved as finished products — that approval pathway applies to mass-manufactured drugs. A COA is a pharmacy-issued quality document showing a specific batch passed specific lab tests. It's a different kind of assurance, not a substitute for FDA approval.