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The recommendation does not constitute FDA approval

GHK-Cu is found naturally in human plasma, saliva, and urine, and its concentration in plasma declines significantly with age, from approximately 200 ng/ml at age 20 to around 80 ng/ml by age 60

To inform policymakers, strengthen research coordination, support early-career scientists, and ultimately improve outcomes for millions living with hormone-related diseases

Choose 2mL (5mg/mL) if: You are starting retatrutide for the first time Your current dose is 5mg per week or lower You want maximum measurement accuracy You prefer straightforward math Choose 1mL (10mg/mL) if: Your dose is 6mg per week or higher You want smaller injection volumes You are comfortable with precise syringe measurements You have experience reconstituting peptides Some researchers start with 2mL during their initial escalation phase and switch to 1mL once they reach maintenance doses above 4mg