melanotan 2 appetite suppression: Frequently asked questions

Discard it and prepare a fresh vial. MT2 exposed to 20–25°C for 8+ hours undergoes structural degradation that compromises MC4R binding affinity, even if the solution appears clear and unchanged. The peptide may retain partial activity, but dosing becomes unpredictable. You can't determine whether 50%, 70%, or 90% of the original potency remains. For research requiring dose precision, using a potentially degraded peptide introduces uncontrolled variables that invalidate results. Reconstituted peptides must return to 2–8°C refrigeration within 30 minutes of preparation and remain refrigerated except during the brief draw-and-inject window.