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While some GHK-Cu does penetrate to the dermis where fibroblasts reside, absorption rates are significantly lower than with direct injection

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However, when troubleshooting GHK-CU problems, simplify first

The "gradual decline" group (approximately 40-50% of users) represents modal experience where benefits slowly regress toward pre-treatment baseline over 4-8 months, typically affecting users who completed shorter treatment courses (2-4 months), used lower concentrations or inconsistent application, possessed moderate to severe baseline skin damage requiring ongoing support, maintained adequate but not optimal complementary skincare, experienced significant lifestyle stressors affecting skin health including poor sleep or high stress, and faced genetic or age-related collagen production limitations