Built for research you can trust
Reproducibility starts with the reagent. We test every lot, publish certificates of analysis, and reject anything that doesn't clear our spec — so your data isn't the variable.
Our quality standard
PeptideXM peptides are synthesized in FDA-registered and ISO 9001-certified facilities using solid-phase peptide synthesis (SPPS). Every batch is purified to ≥ 98% purity by reverse-phase high-performance liquid chromatography (RP-HPLC) before it ships. Lots that fall below spec are rejected, not discounted.
Third-party analytical testing
We don't grade our own homework. Every batch is tested by an independent, ISO 17025-accredited analytical laboratory. A batch is released only when the independent panel matches our in-house qualification.
- RP-HPLC — purity and impurity profiling
- Mass spectrometry (ESI-MS / MALDI-TOF) — sequence and molecular-weight confirmation
- Water content (Karl Fischer) — residual moisture below pharmacopeial limits
- Acetate / TFA counter-ion content — so the peptide mass on the label is actual peptide
- Bacterial endotoxin (LAL) and bioburden for relevant compounds
Certificate of Analysis (COA)
A lot-specific COA is included with every shipment and permanently archived against the order. It contains the method, acceptance criteria, measured values, and the QC analyst's signature. If you need an older COA for audit or publication, email peptidexm@gmail.comwith the lot number and we'll send it within one business day.
Stability and cold chain
Lyophilized peptides are stored at −20 °C in moisture-controlled freezers and shipped in insulated packaging with ice packs. Temperature-sensitive products (GLP-1 analogs, IGF-1 LR3, GHK-Cu) ship with continuous ice coverage sufficient for standard 2–3 day transit. If a shipment is delayed and arrives warm, photograph the packaging on arrival and contact us — we'll replace or refund at our cost.
Traceability
Every vial carries a lot number that maps to the raw material batch, synthesis run, purification fraction, QC panel, and shipping record. If anything ever needs to be recalled, we know exactly where it went.
What we will never do
- Relabel vials from another brand and sell them as ours
- Release a lot without a passing third-party panel
- Obfuscate counter-ion or water content to inflate apparent mg on the label
- Make therapeutic or clinical claims — these are research materials
Have a specific methodological question or need to qualify a new lot for a study? Reach out and we'll walk you through the data.