[Jake R.]

Quick question that I couldnt find a clear answer on: I just received my first order and I’m not sure about storage. The vials are lyophilized (powder form, not yet reconstituted). Should these go in the fridge or freezer? Does it matter?

Also, once I reconstitute with BAC water, how long do I have before it degrades?

[Pete C.]

Good question and it actually does matter.

For lyophilized (powder) peptides: the freezer is ideal for long-term storage (-20 degreesC). If you’re going to use them within a few weeks, the fridge is fine. Keep them away from light, the dark back of the fridge shelf, not the door.

Once reconstituted with BAC water: refrigerate and aim to use within 4 weeks. Some people go longer but peptide stability degrades past that point, especially if there are any freeze-thaw cycles.

Also, always use bacteriostatic water (BAC water), not regular sterile water. BAC water contains 0.9% benzyl alcohol which inhibits bacterial growth and extends shelf life significantly.

[Alex D.]

Pete covered it well. I’d add: avoid drawing up more than you need in a single syringe, each time you pierce the septum you introduce potential contamination. Use a fresh needle each time you draw.

Also label your vials with the reconstitution date so you don’t lose track.

[Jake R.]

Perfect, exactly what I needed. Freezer for the extras, fridge once reconstituted, label everything. Thanks guys!

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