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This matters because antibody formation can indicate immune reactions and potentially reduce peptide effectiveness over time
GHK-Cu levels decline sharply with age, dropping from roughly 200 ng/mL in young adults to ~80 ng/mL by age 60
Working concentration follows directly from the diluent volume
If compounding pharmacies can legally produce these peptides, and physicians can legally prescribe them, the path to rigorous human trials becomes more practical
However, national-level data on exposure and health effects remain scarce, and most studies focus narrowly on food contamination rather than holistic risk assessments
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