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What is the role of copper in GHK-Cu

A small percentage may notice: + Mild tingling or flushing on application + Temporary breakout shift (usually resolves in 12 weeks) + Short-term textural change as cell turnover increases Use with caution or skip if you have a known copper allergy or Wilson's disease (a copper metabolism disorder)

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Heflich RH, Bishop ME, Mittelstaedt RA et al (2024) Optimizing the detection of N-nitrosamine mutagenicity in the Ames test

Vitamin C Injections Known for its immune-boosting properties, vitamin C injections offer a potent dose of this essential nutrient

Practical comparison Many people find their preferred site after trying all three over several weeks