Storage, expiry and the clock that starts when you mix

Storage, expiry and the clock that starts when you mix

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A sealed vial and a reconstituted one are two different objects with two different shelf lives, and the second one is much shorter. The date that matters is not the one printed on the box. It is the day you added water.

That means the mixing date has to be recorded somewhere durable. Written on the vial is good. Written on the vial and in a log is better, because the log survives the vial being moved, and because you will want the history later when you are trying to work out whether a run of weak-feeling weeks lined up with an old mix.

Storage conditions between doses are the other half of it. Repeated warming and cooling is worse than steady cold, and the fridge door is the warmest, most temperature-variable part of the fridge. A shelf near the back is duller and better. Freezing is not a way to extend anything.

Light exposure and vigorous shaking both belong on the list of things to avoid, and both are easy to do accidentally when a vial is being carried around. Gentle handling is not superstition here.

Where a log earns its keep is in linking the mix date to the doses drawn from that mix. If you can see that doses fourteen through nineteen all came from a vial mixed six weeks earlier, you have a real question to ask. If your log only records doses, you have a vague feeling. I keep vial and dose linked in a peptide dose tracker for exactly this reason.

The practical rule I follow is to decide the discard date at mixing time and write it down then, while I am thinking clearly, rather than negotiating with myself about it a month later.

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