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The MHRA position, summarised by Lynda Scammell (head of borderline products at the MHRA) and reported in The Guardian on 4 April 2026, is that products which are sold for human use or which carry medicinal claims fall inside the Human Medicines Regulations 2012, and that the MHRA is investigating UK clinics making such claims about unregulated peptide products

About the Author Maryke Louw is a chartered physiotherapist with more than 20 years' experience and a Masters Degree in Sports Injury Management

It is also listed as a prohibited agent by the US Department of Defense/War as well as by the World Anti-Doping Agency (WADA)

Since the symbol for copper on the periodic table of elements is Cu, this combination is called GHK-Cu

The concentrations used in topical skincare products are working within that familiar biological range