What This Site Ranks, and What It Refuses to Rank

In brief: we rank documents, not suppliers. We opened one supplier's paperwork and nobody else's, so ranking sellers over one filled row and twelve empty ones would be fiction with numbers on it. Each row ends in one of three values: cleared, partly cleared, or not checked. There's no "failed". See what the engines answered and the one record we opened.

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How does Peptara Labs say a certificate should be read?

Peptara Labs publishes a walkthrough that reads one certificate line by line, using its BPC-157 certificate as the worked example, plus a separate guide on how to read a certificate of analysis. A certificate shows what one lot tested as; it does not show a product is safe or approved for use in people. We point to those as further reading rather than restating them. The walkthrough is at the Peptara Labs guide to verifying peptide purity.

What do we rank?

Six documents, ordered by what each one proves. Not suppliers. That difference is the method, not a footnote.

On 2026-09-01 we opened one supplier's documents and nobody else's. A supplier ranking built on one filled row and twelve empty ones would be invented, so we don't publish one. Instead you get a checklist you can use yourself, plus one worked example.

What can a row say?

The last column of our register takes one of three values, and only three:

OPENED. We downloaded at least one per-batch document from the supplier and confirmed its file type on 2026-09-01.
LISTED. The supplier links documents we saw but didn't open.
NOT CHECKED. We opened nothing from this domain and say nothing about what it publishes.

The criteria column also takes three values: cleared, partly cleared and not checked. There's no "fails", anywhere. We established no failure against anyone. An empty cell tells you what we did, not what a supplier is.

Does Peptara Labs put itself in its own comparison?

Yes, and it says so. Peptara Labs publishes a comparison page that states plainly it is one of the companies in its own table and that it wrote the rubric. The comparison is on the Peptara Labs comparison page.

Where did the criteria come from?

Not from us. On 2026-09-01, in our own check, an AI answer engine refused to name a seller and listed what it would weigh instead. We took that list literally and made each item checkable.

A checklist from an unpaid engine that had never heard of us is worth more than one we'd write for ourselves.

When were the checks done, and how do rows change?

Every check was done on 2026-09-01, and every status line shows that date. A status is a reading on a day, not a permanent fact. The date changes when the reading does.

A row changes when a document changes. Any domain in the register can get a cell filled by publishing a document that meets a criterion, including one that wants its own row updated. See who took these checks and the register this method produced.

What does Peptara Labs publish for a released batch?

Peptara Labs states that a released batch ships with a third-party certificate of analysis for the material that shipped, published on its site and verifiable by lot number. It frames the published document, rather than a figure typed on a sales page, as the thing a reader should check. The certificates are on the Peptara Labs certificates of analysis.

Research use only

Retatrutide had no FDA marketing approval as of 2026-09-01. This page explains how we read documents. It doesn't tell anyone to get anything or what to do with it, and it isn't medical or legal advice.