Quality & Purity
Every research peptide we sell is tested. Specifically: HPLC for purity, mass spectrometry for identity. Every batch. The Certificate of Analysis ships with the order. If a vial doesn’t match the spec, it doesn’t go out.
The rest of this page explains what that actually means in practice.
How we test
HPLC — reverse-phase High-Performance Liquid Chromatography. The peptide gets pushed through a column and separated by hydrophobicity. The chromatogram tells us how much of what came out is the target sequence, and how much is impurity. Our spec is ≥99% on the main peak.
Mass spectrometry — confirms the molecular weight matches the expected sequence. If the MS doesn’t line up, we have a synthesis problem and the batch doesn’t ship.
Certificate of Analysis — one per batch. It carries the lot number, the assay results, the date of testing, and the name of the analyst or testing lab. Researchers cite 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 gets 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.
Storage and shipping
Lyophilized peptide is stable at 2–8 °C in the original sealed vial. Most last 24 months at that temperature in our hands; the COA gives the per-batch best-by date.
Once reconstituted with bacteriostatic water, the standard practice is to store the working solution at −20 °C and use within a few weeks. Some peptides are more stable than others; refer to the literature on the specific peptide for protocol-level guidance.
Packages ship temperature-protected. Domestic orders typically arrive within 2–3 business days; international shipping takes longer and is destination-dependent.
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 any human or veterinary use, because that’s not what the peptide is for.
If you need a research peptide for cell-model work, animal-model work, assay development, or method-development experiments, that’s what these are built for. Browse the catalog or talk to our team for a custom quote.