Commercial
Research suppliers
Laboratory research materials are bought by people running experiments, and the difference between suppliers is almost entirely a difference in what they are willing to publish about their own products. These are the criteria we evaluate them against.
Before the table: what this page is not
This page evaluates suppliers, not compounds, and it does not recommend that anyone obtain or use anything. Most compounds sold through these channels are not approved for human use, several appear on FDA lists restricting their use in compounding, and “research use only” is a statement by a seller rather than a regulatory status — as we set out in what “research use only” actually means.
We have not laboratory-tested any product. Peptide Insider has not assayed any supplier's material for identity, purity, potency or sterility, and we will not imply otherwise. What we can evaluate is what a company publishes, whether it can be checked, and whether its marketing matches its stated purpose.
What we look for
The criteria below are weighted toward verifiable transparency over anything we would have to take on trust. The full definitions are published on the research methodology page.
- Independent testing transparency. Does the supplier publish third-party analytical results, and are those results tied to identifiable batches rather than displayed as a single undated sample?
- Certificate of analysis availability. Are COAs published openly, linked to lot numbers that appear on the product, and dated? A COA you cannot match to your vial is not a COA for your vial.
- Testing methodology. Which methods are used, and do they cover identity as well as purity? HPLC purity alone does not confirm that the compound is what the label says it is.
- Claims discipline. Does the site sell research reagents, or does it market human use behind a disclaimer? Dosing charts, physique photography and testimonials are the tell.
Evaluated suppliers
No suppliers have completed the Peptide Insider evaluation yet. Rather than publish a placeholder table, this section stays empty until a real evaluation has been carried out against the published criteria.
How to evaluate a supplier yourself
Four checks that take about five minutes and rule out most of the market:
- Find a COA and check it matches a batch. A single undated certificate displayed on a website tells you a sample was once tested. A COA linked to the lot number printed on the vial tells you something about your product.
- Check what was tested. HPLC purity alone does not confirm identity. Look for mass spectrometry confirming the compound is what the label says, and for endotoxin testing where relevant.
- Read the marketing, not the disclaimer. If a site shows dosing charts, physique photography, stacking suggestions or personal testimonials, it is marketing human use — whatever the footer says.
- Look for a real company. Registered entity, verifiable address, identifiable people. A storefront with none of these has nothing to lose.
Our commercial relationships
Where we have an affiliate relationship with a listed supplier, it is disclosed on the page and the outbound link is marked as sponsored. A commercial relationship does not buy a rating, a position in a table, or the removal of criticism. See the affiliate disclosure and editorial policy for the full rules.