Tested before it ships. Not after someone asks.
Every research peptide we sell is tested — HPLC for purity, mass spectrometry for identity, every single batch. The Certificate of Analysis ships with the order, not on request. If a vial doesn’t match spec, it doesn’t go out.
The rest of this page explains what that actually means in practice.
How we test
Reverse-phase HPLC pushes the peptide through a column and separates it by hydrophobicity. The chromatogram shows how much of what came out is the target sequence, and how much is impurity. Our spec is ≥99% on the main peak.
Confirms the molecular weight matches the expected sequence. If the MS doesn’t line up, that signals a synthesis problem — and the batch doesn’t ship.
One per batch. It carries the lot number, assay results, testing date, and the name of the analyst or testing lab. Researchers use this as the chain-of-custody document for their experiments.
Where the peptides come from
Our manufacturing partners run peptide synthesis in controlled lab environments using solid-phase peptide synthesis (SPPS). After synthesis, the crude product is purified by preparative HPLC, then lyophilized into the powder you receive in the vial.
We don’t manufacture every peptide ourselves. For some compounds, we work with contract synthesis labs we’ve validated against the same purity and identity specs. The COA tells you which lab tested the batch — no guessing.
Storage and shipping
- Lyophilized peptide is stable at 2–8°C in the original sealed vial — typically 24 months at that temperature, with the exact best-by date on the batch COA.
- Once reconstituted with bacteriostatic water, store the working solution at −20°C and use within a few weeks. Stability varies by peptide — check the literature for that specific compound.
- Every package ships temperature-protected. Domestic orders typically arrive in 2–3 business days.
What this isn’t
None of our peptides are FDA-approved. We don’t sell them as drugs, supplements, or therapies. The COA documents purity and identity for laboratory research — it doesn’t certify the peptide for human or veterinary use, because that’s not what it’s for.
If you need a research peptide for cell-model work, animal-model work, assay development, or method-development experiments, that’s exactly what these are built for.
Browse the catalog or talk to our team for a custom quote.