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Journal of Neurology, Neurosurgery & Psychiatry, 69(2), 228-232

Products with 1-2% GHK-Cu concentration in stable formulations with appropriate pH and penetration enhancers create stronger improvements more likely persisting after treatment, while lower concentrations (0.1-0.5%) or degraded products may produce subtle temporary effects disappearing quickly upon discontinuation

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Immediately, COCs with clear or moderately granular ooplasm surrounded by at least three layers of packed cumulus cells were selected and homogeneously distributed in selection medium (TCM199 medium supplemented with 2.38 mg/mL HEPES and 4 L/mL gentamicin)