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Most users notice initial improvements in skin hydration and texture within 2 to 4 weeks
Cell viability for GHK-Cu was previously investigated by Hairui et al, showing no significance difference between the control and the GHK-Cu treated group at the same concentrations and time points, implying the non-cytotoxic nature of GHK-Cu towards HaCaT 11
These may include temporary dizziness, mild headache resolving within hours, slight fatigue (usually with higher doses), and occasional mild nausea
GHK-Cu is also shown to stimulate collagen and elastin, smoothing and firming the skin over time without the potential skin irritation of prescription tretinoin or over-the-counter retinol
