Storing your peptides

Peptides are fragile. How you store them decides how long they last and whether they work at all. The rules split by whether the vial is still dry or already mixed.

Dry, lyophilized powder is stable. For short-term use, it's fine to store in the fridge for a few weeks to a couple of months. If you are stocking up and will not touch a vial for a long time, the freezer keeps dry powder good for a year or more. Cold and dark is the theme.

Once you reconstitute a vial, the clock starts. Keep the mixed vial in the fridge, never the freezer, because freezing and thawing the liquid can damage the peptide. Most reconstituted peptides hold up well for several weeks in the fridge, which is usually long enough to finish the vial. The bacteriostatic water is part of why, since its preservative holds bacteria back.

A few things quietly destroy a vial. Heat, direct light, and rough handling all degrade the compound. Do not leave a vial in a hot car or a sunny windowsill. Do not shake it hard. A gentle swirl to mix is all it ever needs.