What is open, how many doses are left in it, and which vial to finish before it runs out of dating.
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doses in a vial = vial amount ÷ dose · doses left = doses in a vial − doses taken
This is deliberately simple arithmetic on the vial's labeled content, and it assumes every draw is the dose you entered. It does not model the small amount left in the hub and needle after the last full draw, so the final partial dose on any vial is usually a little short of what the count implies. Treat the last dose as the one to verify rather than the one to trust.
Twenty-eight days is the USP convention for a multi-dose vial preserved with bacteriostatic water, and it is a sterility convention. It is an answer to "how long can this be punctured repeatedly and still be considered safe to inject", not "how long does the peptide keep working". Those are different questions with different evidence behind them.
Our own 120-day bacteriostatic water study found the preservative itself outlasts that window comfortably. Peptide stability is a separate matter: it is compound-specific, depends heavily on temperature and light, and for most of the research compounds it is simply unstudied. That is why the beyond-use field is editable rather than fixed, and why this page reports the date you set instead of asserting one.
The ranking is by what is actually at risk of being wasted. Vials are sorted by how much dating is left, and where two are equally urgent, the one with more doses still in it comes first, because that is the one that wastes more. Sealed vials are never recommended: opening a second vial while a dated one is still usable is the specific mistake this page exists to catch.
If a vial is measured in IU and you enter a dose in mg, this page refuses to count doses rather than guessing. An International Unit is defined per substance by biological assay, so there is no conversion between an IU vial and a milligram dose. The unit converter explains the reasoning in full.
PepRecon is a research and education resource. This inventory and its reference material are provided for informational and laboratory-research purposes only, are not medical advice, and are not a recommendation to use any compound. Beyond-use dating here is whatever you enter; nothing on this page establishes that a vial is safe or effective to use. Sterility cannot be judged from a date, and a vial that looks and dates fine can still be contaminated. Your inventory stays in your browser and is never transmitted unless you click Share.