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While sublingual preparations contain very low doses (50100 mg), oral suspensions and solutions have a foul sulfurous taste and need to be freshly prepared
Shaking adds air, creates foam, and can fracture peptide bonds
Liu, S., Wu, H
For perimenopausal women experiencing accelerated skin aging due to declining estrogen, GHK-Cu represents a scientifically plausible optionparticularly in topical formulations where safety data is more established
Pais et al
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