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The plasma level of the natural peptide GHK (which forms GHKCu) averages about 200 ng/mL at age 20 and falls to around 80 ng/mL by age 60, tracking with reduced tissue repair and collagen support in older skin [7]
It crosses the blood-brain barrier and therefore reaches the brain
crosses the BBB & produces CNS effects such as tremor, choreiform movements, and mental aberrations
The bacteriostatic-water vehicle (benzyl alcohol preservative) is what defines that window
Read clinical review Dosing & Monitoring GHK-Cu + MOTS-c Stack: Complete Protocol, Dosing, and Evidence Review A clinician-reviewed protocol for stacking GHK-Cu and MOTS-c peptides, covering mechanisms, dosing schedules, timing, evidence quality, and safety considerations
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