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1-3 HyperHEP B contains high titers of antibodies, equivalent to or exceeding the potency of anti-HBs in a US reference hepatitis B immune globulin standard (established by the Center for Biologics Evaluation and Research, FDA), and provides rapid immune protection for postexposure prophylaxis (PEP)

(d) Cognitive function: Preliminary studies indicate GHK-Cu may help protect neurons and promote cognitive function, but more research (specifically in humans) is needed

Nat Clim Chang 12(9):869875 Papadopoulos T, Baltas KN, Balta ME (2020) The use of digital technologies by small and medium enterprises during COVID-19: Implications for theory and practice

However, sustained high doses, overdose, fasting, alcohol use, or pre-existing liver disease can overwhelm glutathione reserves, increasing risk of hepatotoxicity and oxidative stress