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Over time, those same signals made it popular in cosmetic formulas meant for photoaged skin, uneven texture, and post-procedure recovery

That said, researchers may find it useful to have a bit of background on past GHK-Cu dosing protocols: Minimum Effective Dose The lowest known doses of GHK-Cu administered to test subjects involve the application of skin creams and topical ointments

Furthermore, you might simply be allergic to an ingredient in the supplement

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The study was funded by Novo Nordisk

Research demonstrates improvements in sleep onset latency, total sleep duration, sleep efficiency, and subjective sleep quality ratings without next-day drowsiness, cognitive impairment, or tolerance development