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Safety Considerations and Possible Side Effects GHK-Cu is generally well tolerated topically, with mild localised reactions such as skin irritation or scalp itching being the most commonly reported issues
The B12 component adds another layer that most guides skip entirely
Oxidative stress occurs when there's an imbalance between free radicals and antioxidants in your body
Gradual Introduction: Start with lower concentrations (e.g., 0.05% to 1%) and less frequent application (e.g., every other day) to allow the skin to acclimate, especially for sensitive skin types
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