Should I use a desiccant when storing peptides?

It helps. Damp is a big cause of breakdown. Putting vials in an airtight container with a drying pack (the little silica packet) adds useful protection, mostly for long freezer storage. Peptides soak up water from the air once a vial is opened.

The whole guide to mixing peptides, step by step, in the order problems come up

Educational use only. This database summarizes published research and is not medical advice. Where a dose appears it is a record of what a trial or clinic ran, or what people describe doing, with its source attached. Nothing here is a recommendation for personal use.

Part of storing unmixed (lyophilized) peptides. How to store the freeze-dried powder before you add any water.