Can I freeze a reconstituted peptide to make it last longer?

You can with some peptides. But freezing and thawing a liquid stresses the peptide, and doing it again and again is a bad idea because it can break the peptide down. If a mix is frozen, it is usually frozen once and thawed once. For most people, keeping it in the fridge and using it within the normal time is simpler and safer.

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 shelf life after reconstitution. How long a peptide lasts once it is mixed, and how to store it.