They found that long-term beta blocker administration decreased endogenous melatonin production by 50%, and in these patients taking the beta blockers, there was a significant increase in sleep latency (the time it takes for a person to fall asleep after lying down in bed and attempting to sleep) and decreased REM sleep (REM sleep is characterized by rapid movement of the eyes, vivid dreaming, and heightened brain activity)
However, formulators should exercise caution when combining ghk cu powder with vitamin C or alpha hydroxy acids, as these ingredients can destabilize the copper-peptide complex or alter pH levels in ways that reduce efficacy
If your real goal is to even out pigmentation or brighten dull skin, there are safer, better-studied routes, which we touch on at the end
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The most commonly reported improvements involve libido, energy, motivation, strength, exercise recovery, and body composition