§ Lab Transparency
How we actually test.
Every batch. Two labs. Public results.
Here’s the full chain of custody from peptide synthesis to your purchase order.
▸ The labs
Two labs. Different continents. Zero overlap with us.
▸ Lab 01 · Czech Republic
Janoshik Analytical
The industry’s most-cited independent peptide testing lab. Used by competing vendors as well as research institutions. They have no commercial relationship with PeptiUSA — we pay them per test like everyone else.
Tests performed
- HPLC purity (UV 220nm)
- Mass spectrometry identity
- Visual inspection
▸ Lab 02 · Texas, USA
Aethos Bioanalytics
US-based independent bioanalytical lab serving research and pharma. Runs a second HPLC pass plus LAL endotoxin testing on injectable batches. If the two labs disagree on purity by >1%, the entire lot is destroyed.
Tests performed
- HPLC purity (UV 214nm — independent run)
- LAL endotoxin (injectable batches)
- Karl Fischer water content
▸ Chain of custody
Six steps. Every batch.
01
Synthesis
Solid-phase peptide synthesis at a GMP-equivalent facility. We disclose the synthesis location for every product on its page. No “anonymous overseas lab” stories here.
02
Lyophilization & vial fill
Crude peptide is purified, freeze-dried, and aliquoted into clean glass vials under controlled conditions. Each vial gets a unique lot code at this stage.
03
Sample → Janoshik (Lab 01)
3 random vials per lot ship to Czechia for HPLC and mass spec. Turnaround: 5-7 days. If purity < 99% or identity doesn’t match — go to step 6.
04
Sample → Aethos (Lab 02)
3 different vials from the same lot go to Texas for independent HPLC plus LAL endotoxin for injectable formats. Turnaround: 3-5 days.
05
Cross-check & publish
If both labs agree (<0.5% delta on purity) — both COAs go online on the product page. We never edit them, we never hide one. If they disagree >1% — go to step 6.
06
Failed lot? Destroyed.
Lot is incinerated. Lot ID goes into our public rejection log. We eat the cost — never resold, never “blended” into another lot.
▸ Per-product
Every product page shows the full chain.
Open any product. You’ll see — not as fine print, but as the main content:
- Sequence — full amino acid sequence in 1-letter notation
- Molecular weight — calculated and confirmed by MS
- Lot number & manufacture date
- Expiry date — based on stability data for the form (lyo vs liquid)
- Both COAs as embedded PDFs — Janoshik and Aethos, downloadable
- Reference list — PubMed IDs of the literature we used to characterize the compound
- Synthesis facility — country and certification status