Built for the buyers who read the COA.

Vial Verdict reviews research peptide suppliers using a public methodology. Five criteria, weighted by how often each actually breaks for buyers. No vibes-based scoring.

We started this because most "best peptide supplier" rankings on the open web are either (a) sponsored content with no disclosure, or (b) ranked by aesthetics rather than data. Neither is useful when you need a reference standard and you're going to test the lot anyway.

How to read a review

• The aggregate score is rounded to one decimal. Anything above 8.5 is excellent; 7.0-8.5 is reliable for most use cases; below 7.0 has concrete deficiencies that should make you cautious.
• Per-category scores are what matters when you're optimizing for a specific use case. A 9.5 on COA per-lot with a 5.0 on shipping is fine for slow research work and bad for time-sensitive labs.
• Pros and cons reflect specific operational observations, not opinions.

Affiliate disclosure

Some supplier links on Vial Verdict are affiliate links. The disclosure is in the footer of every page. Scores are not adjustable by suppliers — paid or otherwise. See the methodology for the scoring rubric.

Corrections

If a supplier has updated their practices and a review is stale, email us with a link to the change and we'll re-score: hello@vial-verdict.com