Rankings are based on real data — not opinions, not ads, and never pay-for-placement. Here's exactly what goes into every comparison.
Our trust scores come from Finnrick Research, who blind-tests vendors by purchasing products anonymously and sending them to independent labs for purity analysis. Vendors never know when they're being tested, so the results reflect what real customers actually receive.
We are building an ingest for public test reports from Janoshik Analytical, the most widely-used independent peptide testing lab. Vendors with more public tests are demonstrating transparency — they're willing to let third parties verify their products. This factor currently contributes nothing to a vendor's score: we have no Janoshik reports ingested yet, and we would rather say that than imply a weight we do not apply.
We calculate cost per milligram so you can compare prices fairly across different vial sizes. A lower price helps a vendor's ranking, but never at the expense of trust or quality.
Products currently in stock are shown first. But a trusted vendor with a temporarily out-of-stock product will still rank above an untested vendor with stock available.
Scores are based on blind lab testing — most vendors land between 4 and 7. These are strict standards, so don't be alarmed by mid-range scores. Any vendor with a score has been independently verified, which puts them ahead of untested vendors.
9.0 – 10
Phenomenal
Near-perfect quality. The highest tier — very few vendors reach this level.
8.0 – 8.9
Exceptional
Top-tier quality. Consistently high purity across multiple blind tests.
7.0 – 7.9
Really Good
Strong results. Reliable vendor with solid lab-verified quality.
5.0 – 6.9
Solid
Independently verified. Acceptable quality with room to improve.
4.0 – 4.9
Iffy
Mixed results. Some tests passed, others raised concerns.
Below 4
Poor
Significant quality issues found in independent testing.
We never accept payment to influence rankings. We may earn affiliate commissions when you click through to a vendor, but this has zero effect on how vendors are ranked. The algorithm is the same for everyone.
Read our affiliate disclosure for full details.