How we evaluate vendors

Every vendor on this site is assessed against publicly verifiable laboratory documentation. We do not score a vendor on reputation, forum sentiment, or marketing copy.

For each vendor we look at the same set of evidence:

• Certificates of Analysis, checked against the specific batch offered for sale
• Identity and purity results, primarily HPLC and mass spectrometry
• Sterility and endotoxin testing where the product format makes it relevant
• Whether the issuing laboratory is named, independent, and contactable
• Whether lot or batch numbers are published and consistent across documents
• Whether the company discloses a legal entity, address, and working contact route

Where documentation is missing, unverifiable, or does not match the batch being sold, that is recorded as a gap. A vendor that cannot supply third-party documentation is not listed.

Scoring and updates

Scores are derived from the underlying laboratory data and the completeness of a vendor’s documentation. A score changes when that evidence changes, not on a fixed schedule and not on request.

Pricing figures are indexed from public vendor listings and normalised to price per milligram so that different vial sizes can be compared directly. Prices move frequently; the figure shown reflects the most recent index run.

Independence

Peptide Insider is not a vendor and does not sell peptides.

How this site is funded. Some of the links to vendors on this site are affiliate or referral links, which means we may earn a commission if you buy after following one. That revenue is what pays for the work published here. This is our funding model and we state it openly rather than leaving you to guess.

What that money does not buy. A vendor cannot pay for placement, for a higher score, or for the removal of a finding. Having an affiliate arrangement with a vendor does not raise their score, and not having one does not lower it. Scores are derived from laboratory documentation and the completeness of a vendor’s disclosures. The same evidence is applied to every vendor, including those we earn nothing from.

If you would rather we earned nothing from your purchase, going to a vendor directly instead of through a link here costs you nothing and changes nothing about what we publish.

Corrections

We publish corrections in the open. If a figure, a document reference, or a conclusion is wrong, we correct the page and note what changed and when.

If you believe something on this site is inaccurate, including a vendor who wants to dispute a finding, write to contact@peptideinsider.org with the specific page and the documentation that supports the correction. Vendor submissions are reviewed against the same evidence standard as everything else.

What this site is not

This is a research and sourcing resource, not a medical publication. We do not provide dosing guidance, treatment recommendations, or medical advice, and we do not tell readers to use any compound.

We do publish arithmetic. The reconstitution calculator converts figures you enter — the peptide in your vial, the water you added, the dose you have already decided on — into a concentration and a reading on a syringe barrel. It supplies none of those figures itself, it recommends no dose, and where a result would be impossible or unsafe to measure it says so rather than printing a number and staying quiet.