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Loren Pickart, who discovered GHK-Cu's skincare applications, found no additional benefit from concentrations above 3% and noted that higher concentrations may actually be counterproductive
ISBN 0-521-82873-2
And I'll link to some, I'll link to some, I'll link to a, a YouTube series too that I also like to use for strength training
Medically reviewed by Dr Clair Grainger Last reviewed: 29 Jun 2026 With Superdrug Online Doctor you can message our Doctors for FREE via your patient account
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