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In controlled lighting studies involving rodents subjected to constant illumination (a stressor that disrupts circadian patterns), intermittent Epithalon treatment normalized melatonin and cortisol rhythms, partially preserving typical daynight physiological cycles [2][4][5]

Also, because of Glutathione, the serum may have slightly sulfuric smell and less blue hue

Beijing: National Medical Products Administration, 2021

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Safety Considerations and Provider Guidance Before Starting GHK-Cu GHK-Cu is generally well-tolerated in published reports, but long-term human safety data is limited