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A 2025 systematic review identified 36 studies from 1993 to 2024, including 35 preclinical studies and only 1 clinical study

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Injectable GHK-Cu reaches follicle-depth tissue at 10 to 20 times the concentration of topical serums, making it more effective for moderate-to-advanced loss

Observational studies A large number of cross-sectional and prospective cohort studies have associated elevated blood homocysteine concentrations with measures of poor cognitive scores and increased risk of dementia, including Alzheimer's disease (reviewed in 67, 69)

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