For critical research where potency matters, analytical testing through peptide testing labs can confirm whether a given vial still contains active, intact peptide
Peptide Vials (GHK-Cu, 100 mg each): 8 weeks (~40 injections, ~50 mg total) 1 vial 12 weeks (~60 injections, ~90 mg total) 1 vial Insulin Syringes (U-100, 30- or 50-unit preferred): Per week: 5 syringes (1/day, 5 days) 8 weeks: 40 syringes 12 weeks: 60 syringes Bacteriostatic Water (10 mL bottles): Use 3.0 mL per vial for reconstitution
7 Pharmacological Reviews Amylin pharmacologyHay DL et al
PlexusDx specializes in compounded GLP-1 peptides (semaglutide, tirzepatide) and microdose protocols
The pattern: across nine different vial/compound combinations in the tables above, 2 mL of bac water produces clean unit counts for trial-documented doses