How we review suppliers
Every supplier file uses the same seven checks. We look at what the supplier publishes, compare it with what a careful lab would expect, and say clearly where we could not confirm something.
- Independent lab testing
- Testing done by a lab that is not owned by the seller, and named on the report.
- Batch-specific COAs
- A certificate of analysis for the actual batch on sale, with a batch number you can match to the vial.
- Identity confirmed by mass spec
- Mass spectrometry results showing the molecule is the one on the label, not just a purity percentage.
- Research-use labeling
- Clear research-use-only labeling on the site and products, with no dosing advice or health claims.
- Age and use confirmation
- An age check and a research-use acknowledgement before purchase.
- Clear shipping and refund terms
- Written shipping, storage-in-transit and refund or reship policies that are easy to find.
- Business transparency
- A real contact route, a stated business location and terms of sale.
How the score works
The score out of 5 weighs testing and paperwork most heavily, because that is what a researcher can verify. Independent testing, batch-specific certificates and identity results together make up most of the score. Labeling, purchase checks, policies and business transparency make up the rest. A supplier with polished marketing but thin paperwork will score lower than a plain site with complete reports.
What we can't verify
We read what suppliers publish; we don't buy or lab-test products ourselves. A certificate can be real and still not describe the vial a customer receives, which is why we explain how to match batch numbers and confirm reports with the testing lab. When a supplier changes its testing or policies, scores can move. Each file shows when it was last updated.
Mixed-format stores
Some suppliers sell self-administration formats such as sprays, pens or capsules alongside research vials. We list them, but they fail the research-use labeling check and score lower, and their files only describe the vial range.
What we leave out
Supplier files don't include dosing, protocols, effects or health claims, even when a supplier's own site does. We don't list suppliers that publish dosing calculators or administration guides, market products for weight loss, bodybuilding or other body goals, offer coaching, or sell prescription drugs.
Corrections
If a supplier file is out of date, email hello@inhousepep.com with a link to the current page or document and we will check it.