Topical applications may show initial improvements in skin texture and hydration within 2-4 weeks, with more significant changes in collagen production and skin firmness becoming apparent after 8-12 weeks of consistent use
GHK-Cu in the morning or one night, retinoids or Vitamin C on alternate evenings
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April 2026 Category 2 Update On April 15, 2026, the FDA confirmed removal of injectable GHK-Cu from Category 2 because the original nominations were withdrawn
The optimal choice depends on the nature of the condition, treatment goals, and individual response patterns