5 questions about storage & shelf life.
28 days in the fridge with BAC water. Some people push it to 60 but 28 is the safe number. With sterile water (no preservative), use it within 24-48 hours or toss it. After 28 days with BAC water, the peptide might still have some effect but potency drops and bacterial risk goes up. If you can't finish a vial in 28 days, reconstitute with less water next time so you get fewer, more concentrated doses.
Don't. Ice crystals form and shred the peptide's structure. The freeze-thaw cycle is basically a peptide blender. Unreconstituted powder (the dry stuff before you add water) can absolutely go in the freezer — that extends shelf life to 12-24 months. But once you've added water, keep it in the fridge, not the freezer. Use within 28 days.
If it's cloudy, has floaters, changed color, or smells off — don't use it. It should be clear. If it was clear when you mixed it and now it's not, that vial is done. The sneaky sign: you've been getting consistent results and they suddenly stop. Degraded peptide is usually the reason. Also watch for powder that arrives as a wet cake or sticky residue instead of a clean dry puck — that means it got warm during shipping and you're already starting at a disadvantage.
Four things will ruin your peptide: heat (anything above fridge temp accelerates degradation), light (UV breaks peptide bonds — keep vials in the box or wrap them in foil), shaking (denatures the protein — always swirl gently), and contamination (dirty needles or touching the rubber stopper with your fingers). Also: repeated freeze-thaw cycles for the powder, and leaving reconstituted vials sitting on your bathroom counter. The fridge is your peptide's entire personality. Keep it there.
Get a small insulated medical cooler with gel packs. A FRIO wallet is popular — it uses evaporative cooling and doesn't need ice. For flights, always carry-on (checked luggage can freeze in the cargo hold). Keep the vial upright so the solution doesn't sit against the rubber stopper for hours. For anything under 24 hours, an insulated lunch bag with a frozen gel pack works fine. Don't overthink it.
← All FAQ topics | Browse all peptides
vialprep research · Sources: PubMed, FDA, peer-reviewed trials · How we verify