What gets lost in most consumer articles is that GHK-Cu is not a meaningful DHT blocker in the way finasteride is, and its clinical evidence for pattern hair loss, while promising, remains limited compared to the two FDA-approved treatments
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The intranasal GHK-Cu treatment was found to delay cognitive impairment, reduce amyloid plaques, and lower inflammation levels in the frontal cortex and hippocampus .37 Randomized controlled trials in human patients are needed to confirm the benefit of GHK-Cu for cognitive decline and Alzheimers disease as well as to evaluate safe and effective human dosing (the human dose equivalent of 15mg/kg in mice would be ~1.2mg/kg, though data on this or any other dosing nasally in humans is not currently available), but preliminary animal trials are promising
The research team also conducted a double-blind, cross-over study involving eight healthy men (average age, 36 years) who received either glutathione or placebo for two weeks
Are glutathione supplements safe