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Your body produces GHK-Cu on its own, but levels drop sharply with age
If your goal involves gastrointestinal healing, the peptide contacting intestinal tissues directly could provide benefit even if it never reaches the bloodstream
However, topical products often contain additional ingredients that may cause reactions independent of the copper peptide itself
Plasma concentrations decline with age - from approximately 200 ng/mL at age 20 to under 80 ng/mL by age 60
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