Never mix peptides with different optimal pH ranges or storage requirements in the same vial, as this compromises stability. Additionally, avoid mixing peptides you may want to adjust dosing for independently. GH-releasing peptides (CJC-1295, Ipamorelin) should not be mixed with copper peptides (GHK-Cu) due to potential pH and metal ion interactions. The
United States Pharmacopeia recommends maintaining separate preparations unless pharmaceutical compatibility data exists.