A GLP-1 dose log only needs four columns: date, dose in mg, injection site, and any side effects that week. Writing the mg down beats trying to recall it at the next titration step, and rotating sites is much easier to keep honest on paper than in memory.
Reconstitution is where most of the arithmetic mistakes happen. The number that matters is mg per mL after you add bacteriostatic water: divide the vial strength by the volume you added, then divide your target dose by that concentration to get the units to draw. Do it once, write it on the vial label, and re-check it any time the vial strength or the water volume changes.
I keep the log and the reconstitution math in one place at Peptide Tracker & Calculator, which also holds explainer pages for the individual compounds.