How to read a batch record without treating it as a safety certificate

A batch record is a label for one lot. It says what the seller claims was in that container, how they say they checked it, and when. It is not a clinical study, and it is not a promise that the next vial from the same name will match.

Avion Now’s lookup page is there so a lot code can be matched to a record. The records shipped with this preview are samples. Replace them with your laboratory’s own file before you treat a result as real.

Start with identity, not purity

The first line that matters is the one that says which molecule was tested. For a single peptide that means a sequence, or a mass that matches the sequence, including any modification. For a blend it means a list of components. A single purity percentage on a blend is not an identity.

TB-500 is the cautionary example. The name is used for a short acetylated fragment and, wrongly, for the much larger protein thymosin β4. A record that only says “TB-500, 98%” has not told you which one was in the vial. A mass near 889 g/mol points at the fragment. A mass near 5 kDa points at the protein. The number has to be in the record.

Purity is a method, not a moral score

Reversed-phase HPLC with ultraviolet detection reports an area percent. It says how much of the ultraviolet signal sat under the main peak. It does not, by itself, say that the peak is the right molecule, and it does not say how much of the powder is peptide rather than water, salt, or residual solvent.

Mass spectrometry is what ties a peak to a mass. Ask whether the observed mass is the monoisotopic mass of the free peptide or of a salt, and whether the charge state was interpreted correctly. A certificate that skips the salt form has skipped the fact that decides how much peptide a stated milligram contains. BPC-157 is a clear case: the free peptide and the acetate do not weigh the same.

What a record cannot do

A clean chromatogram does not make a research chemical into a medicine. It does not set a dose. It does not say the material is sterile unless sterility was actually tested and the method is named. It does not travel to a different lot.

If you are comparing two sellers, compare the fields, not the adjectives. Identity, salt, stated content, method, date, and laboratory. Anything that cannot be pointed at on the page is decoration.