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In plasma the level of GHK is about 200 ng/mL at age 20 but declines to 80 ng/mL by age 60. [5] Empire Medical Training (2026)

While animal studies consistently demonstrate beneficial effects across diverse injury models and tissue types, the absence of adequately powered, controlled human clinical trials prevents definitive conclusions about efficacy in human disease

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Modulates GABA and serotonin systems to reduce anxiety, improve stress resilience, and enhance emotional stability without sedation or cognitive impairment