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Authentic GHK-Cu exhibits a characteristic blue shift when mixed with alkaline solutions, degrades predictably under UV exposure at 254nm, and produces a visible precipitate when combined with ferric chloride

There is an incredibly large leap from anecdotes and rat testing to human applications

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Comparative analysis found GHK-Cu improved collagen production in 70% of treated women, compared to 50% with vitamin C cream and 40% with retinoic acid

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Instead, the benefits are often noticed gradually over several weeks of consistent use