Peptides are fragile. Not in a handle-with-care way — in a you-can-ruin-a-$200-vial-by-leaving-it-on-your-counter way.
Here's what actually matters.
Temperature
Most reconstituted peptides stay stable for 4-6 weeks refrigerated at 36-46°F. Unreconstituted lyophilized peptides can last much longer — some up to a year or more at room temp if kept dry and dark, longer frozen. The second you add BAC water, the clock starts.
Don't freeze reconstituted peptides unless you absolutely have to. The freeze-thaw cycle degrades them faster than just keeping them cold.
Light
UV degrades peptide bonds. Amber vials help. A dark case helps more. If your vials are sitting on a shelf in direct light, you're degrading your product every day.
Orientation
This one surprises people. A vial that tips over gets the stopper wet. A wet stopper invites contamination. Store vials upright, always.
The Travel Problem
This is where most people cut corners. A peptide kit thrown into a gym bag or a checked bag isn't going to survive a flight the way you think it will. Vials tip. Syringes cap. Things roll around. One broken vial in a bag is a bad day.
The case we built at Rx Cases started here. We wanted vials to stay upright, syringes to stay capped, and the whole kit to survive being flipped upside down in an overhead bin. Load it, close it, flip it. Nothing moves.
If you're traveling with a protocol, that's the standard worth holding.
Reconstitution Water
Bacteriostatic water, not sterile water. BAC water contains 0.9% benzyl alcohol, which acts as a preservative and extends the life of your reconstituted peptide. Sterile water has no preservative — once you open it, contamination risk goes up fast.
Use a 1oz glass bottle for your BAC water supply. Easier to measure from, easier to travel with, less waste than cracking a new vial every time.
Cold, dark, upright, and in something that won't let them move. That's it.