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Topical vs Injectable: Evidence Comparison The two delivery routes have fundamentally different evidence profiles: Topical GHK-Cu has decades of published clinical trial data for skin aging, wound healing, and hair density
You will likely notice fewer intrusive cravings and steadier intake, but stress patterns, eating-related habits, and the need for ongoing monitoring do not automatically change
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Most people notice initial improvements in skin texture and hydration within 2-3 weeks
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