Freezing after mixing is not advisable because it alters how the molecules are arranged. I also hesitate with bigger amounts since I would not finish them quickly enough. General guidance suggests using a reconstituted vial within roughly two months.
I noticed larger kits cost less per milligram than smaller ones. At my current weekly amount I would finish a big reconstituted vial well past any usual time frame. Search results give mixed signals on whether freezing after mixing works. My plan is to add bacteriostatic water, split the solution into several smaller vials, and store them in a standard freezer. I wonder if that step would harm the peptide or if I should just stick with the higher-priced smaller options.