doi:10.1186/s12891-017-1571-8 , 11 Schneider B, Varghis N, Kennedy DJ
the dose range is derived from the individual compounds
The majority of the published literature examines each compound independently, and the synergy hypothesis, while mechanistically well-supported, has not yet been the subject of large-scale controlled studies

Lyophilized GHK-Cu shelf life (before reconstitution) Freezer storage (-20C): 12-24 months Most common storage Standard home freezer adequate Expected shelf life: 18-24 months typical GHK-Cu slightly shorter than some peptides (copper oxidation) Still excellent storage option Why GHK-Cu shelf life shorter than some peptides: Contains copper (oxidation concern) Copper can catalyze degradation More sensitive than copper-free peptides But still stable for 1-2 years frozen Refrigerator storage (2-8C): 6-12 months Acceptable if using soon Shorter than freezer 6 months very safe 12 months likely fine but degradation starting Room temperature: Weeks to 2-3 months Not recommended for storage Only during shipping or brief periods Copper oxidation accelerates Use freezer or fridge GHK-Cu vs other peptides shelf life: Maximizing lyophilized GHK-Cu shelf life: Freeze immediately upon receipt Keep in sealed vial (moisture is enemy) Store in box (protect from light) Minimize freeze-thaw cycles Label with date received See our peptide storage guide , do peptides expire , and should copper peptides be refrigerated

Why does the copper-to-peptide ratio matter if the label already says GHK-Cu
Solution turns cloudy after initial clarity A solution that was clear after reconstitution but turns cloudy during storage typically indicates protein aggregation due to temperature excursion (the vial got too warm or too cold) or bacterial contamination