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Vitamin B12 has been shown to improve the depth and quality of sleep within studies
Attributing the result to GHK-Cu alone isn't science, it's wishful accounting
Benefits, where present, require continued administration nothing about the injection produces a lasting metabolic change once it stops
In the UK, GHK-Cu products are sold as cosmetics regulated under GB Cosmetic Products Regulation and cannot legally make medicinal claims about treating hair loss
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