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GHK-Cu is contraindicated because it delivers additional copper
GS-conjugates are actively transported out of cells by efflux transporters including MRP1 and P-glycoprotein belonging to the superfamily of ATP-binding cassette transporters 70,71,72
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Melatonin plays a crucial role in regulating the sleep-wake cycle, with its production naturally declining with age, correlating with a decrease in sleep quality among older adults, suggesting a potential therapeutic role in treating sleep disorders through supplementation
