We set a minimum 99% purity threshold - stricter than most research suppliers - and verify it with every single batch.
Purity refers to the proportion of the desired compound relative to total content, measured by HPLC peak area. A 99%+ purity result means no more than 1% of the content is anything other than the target peptide.
In practical terms for research:
| Supplier Tier | Typical Purity | BuyPeptides.now |
|---|---|---|
| Economy / unverified | 85–90% | 99%+ |
| Standard research grade | 95–98% | |
| Premium / pharmaceutical | 98–99% |
We use HPLC (High Performance Liquid Chromatography) - the gold standard method for peptide purity analysis. The sample is injected into a chromatography column and separated by chemical properties. The detector measures each component, producing a chromatogram where peak areas correspond to relative quantities.
Our specification: the target peptide peak must represent ≥99.0% of total peak area. Batches failing this threshold are rejected and never shipped.
HPLC chromatograms and purity data are available for every batch. Request yours via support ticket with your order number.
