How We Test

Most vendors publish manufacturer COAs and stop there. We don’t accept manufacturer tests — manufacturers have every incentive to submit optimized vials. Our process is built so that no single party, including PGB, can compromise the results.

Round 1 — Randomized in-house testing

When a shipment arrives from the manufacturer, we randomly pull vials from across multiple kits before product is logged, stored, or prepared for sale. Random sampling across kits prevents the manufacturer from submitting cherry-picked vials for testing. These samples are sent to an independent lab for identity, purity, and mass analysis.

Round 2 — True third-party verification

Round 1 is only the start. To independently validate those results, we run a second round of testing using vials pulled from the field — product already in the possession of paying customers. PGB pays for and organizes this round — and reimburses the donor for the vial they contribute — but we never handle the vials.

The process:

1. Donor call. We notify members with verified purchase history that a testing round is open. Interested donors have 72 hours to opt in.
2. Random selection. Each donor is assigned a unique number. A random number generator selects one donor, and the selection is documented for transparency.
3. Verification. The selected donor submits photos of the exact vial being shipped.
4. Shipment. The donor ships directly to the testing facility (or a designated intermediary member) using a PGB-provided label generated through Pirate Ship, via UPS or another tracked carrier.
5. Chain of custody. Tracking information and proof of shipment are shared with the community. The lab confirms receipt. No PGB administrator handles the vial at any point.
6. Results. Test results are published to all members, along with documentation of the donor selection and shipment process. Member questions and feedback are addressed directly.

Contamination screening

For larger batches we also run contamination screening — a research-integrity measure that matters for the reliability of in-vitro work. Microbial contamination in a research chemical can confound cell-culture and biochemical assays by altering pH, consuming substrates, or introducing competing biology that the experimenter didn’t account for. Endotoxin (lipopolysaccharide) is a potent biological signal that activates TLR4 and downstream inflammatory pathways — even trace contamination can corrupt studies of immune signaling, cell viability, and inflammation. Sterility and endotoxin data let researchers rule these contaminants out as confounding variables before they invest in further experiments.

Why this matters

Our methodology removes trust from the equation. You don’t have to trust the manufacturer’s test (we don’t). You don’t have to trust PGB’s internal test. A second vial — pulled from a real customer’s order, by a randomly selected member we’ve never touched — independently confirms the result.

Trust but verify. Built in.

Published lab results by product

Showing our latest published batch test per product. We ship by stock rotation, so the exact lot you receive may differ — every lot’s full report is linked.

What a Round 2 result means

Round 1 is run on vials pulled at random when a lot arrives, before it is released for sale. PGB releases a lot at full price only when Round 1 shows purity of 99% or higher. The guarantee floor customers can claim against is 98%.

When Round 1 lands between 98% and 99%, PGB may still release the lot, on three conditions: a second laboratory tests vials from the same lot, every result from every laboratory is published on the lot page before the first kit ships, and the lot is sold at a reduced price for as long as it is on sale. The lot page states which result the price reflects. The 98% guarantee floor, Round 2 testing, and the remedy schedule apply to these lots exactly as to any other. A lot that reads below 98% at Round 1 is not released.

A note on the second laboratory. For many research peptides, no accredited laboratory offers a validated purity method, and only a handful of unaccredited laboratories test them at all. That is a limit of the testing industry, not a choice PGB makes, and it means the second result sometimes comes from a laboratory outside our approved list. When it does, the lot page names that laboratory and says so. PGB started releasing lots this way in October 2026 with four lots that read between 98.3% and 98.8% at one laboratory and above 99% at another; each of those lot pages carries every report.

Round 2 is run weeks or months later on vials pulled from customer inventory, shipped by the donor directly to the laboratory. A Round 2 vial is older product, so its result reflects the lot as shipped plus everything that happened to that vial afterward: transit, warehouse time, and the donor’s storage. Each lot page shows the analysis date of every round and how many days separate them. Lyophilized peptides held frozen lose very little purity over a year; the same vials at room temperature can lose several points in a few months. The Storage & Handling guide explains which compounds are most sensitive and how to store them.

A small decline between rounds is expected and is not a defect. A Round 2 result below the 98% floor pauses new sales of the lot the same day. PGB then confirms the result with a second test (another approved laboratory, an ISO/IEC 17025 laboratory, or a retest of the reserve sample). Once confirmed, PGB publishes both results on the lot page and notifies every purchaser delivered within the 30 days before the earliest failing result or after it. Those purchasers receive the remedy set by the schedule in the Returns, Refunds & Reship Policy (50% store credit for a confirmed purity of 95.0% to 97.9%; 100% below 95.0% or on a mass failure) without commissioning their own test. PGB also uses the failing result to review where and how the lot was stored before it shipped.

A result below 98% has happened once. We treat it as a failure of our process, not a cost of doing business, and we publish what we changed.

Reading a lab report

Purity on a PGB lot page is the laboratory’s HPLC area-percent figure: the share of everything the detector saw that was the intact peptide. A method that separates degradation products from the parent peptide will report a lower number on aged product than a method that does not, because it can see the change. PGB accepts results only from laboratories whose methods make that separation, and the approved list on this page may change as PGB qualifies laboratories, including ISO/IEC 17025-accredited laboratories for confirmatory work.