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Look at almost any peptide certificate and the biggest number on it will be a purity figure, usually somewhere between 98% and 99.9%. It's worth knowing exactly what that number is, because it answers a specific question and not every question.
Purity is normally measured by HPLC (high-performance liquid chromatography). The sample is separated into its components, each shows up as a peak on a chart, and purity is the main peak's share of the total. A 99% result means 99% of the detected peptide material is the one dominant substance.
It's a measure of composition. It tells you the material in the vial is overwhelmingly one thing, and that impurities from synthesis have been cleaned out.
What proportion of the peptide material is the target molecule. A ratio, read from the HPLC chart.
Whether that molecule is the right one. Confirmed by mass spectrometry, which checks the molecular weight against what it should be.
How many milligrams of peptide are in the vial. A separate measurement, reported as a mass rather than a percentage.
Freeze-dried peptide is never 100% peptide by weight. Alongside the molecule itself there is a little residual water and counterions left over from purification, typically acetate or trifluoroacetate. That's normal chemistry, not a defect, and it's why reference data always quotes molecular weight for the free compound while the supplied salt form weighs slightly more.
The short version
Purity tells you the material is clean and overwhelmingly one substance. Identity tells you it's the right substance. Quantity tells you how much. A good certificate is read for all three, not just the headline.
The certificates we supply come from Janoshik, an independent laboratory in the Czech Republic. Our own BPC-157 result, from a vial off our own shelf, came back at 99.892% purity with 5.71mg measured on a 5mg vial, and it's published in full on our testing page.
All products supplied by Zenic Labs are for laboratory research use only and are not for human or veterinary consumption. No health, dosing or therapeutic claims are made about any product we sell.
Also worth reading
Eight things you can check yourself before ordering from any UK peptide supplier, including us. Most take under a minute.
How white label and wholesale research peptides work in the UK: labels, documentation, traceability, margins and the questions to ask a supplier.
What a lot number on a peptide vial actually tells you, how to check one, and why it matters more than any certificate if something goes wrong.