Refrigeration is not required for most compounded GHK-Cu creams unless specified on your label, but keeping the cream below 77F (25C) helps preserve peptide stability
The standard protocol runs 4 to 8 weeks, with many athletes combining BPC-157 with TB-500 for enhanced results

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Scientific References Novel GLP-1-based Medications for Type 2 Diabetes and Obesity
Standard diluent for both Retatrutide and GHK-Cu
Topical effects Most reported topical effects are mild and local: redness, tingling, dryness, or transient irritation at the application site, typically more common with concentrations above 4%