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Low levels of glutathione have been implicated in both acute and chronic health problems, including health problems associated with severe COVID-19 infection

[Confidence: Medium] Organ-Specific Targeting: By isolating the hippocampus, the researchers confirmed that GHK-Cu can cross the blood-brain barrier (or bypass it via olfactory tracts) to modulate neuroinflammation and synaptic plasticity, which are critical bottlenecks in age-related cognitive decline

Cancer Res 52(23):67126715 Uematsu F, Kikuchi H, Motomiya M, Abe T, Sagami I, Ohmachi T, Wakui A, Kanamaru R, Watanabe M (1991) Association between restriction fragment length polymorphism of the human cytochrome P450IIE1 gene and susceptibility to lung cancer

This combination enhanced the frequency of NY-ESO-1-specific effector CD8 + T cells producing IFN- and promoted lymphocyte migration to the tumor infiltrate, ultimately controlling the development of an established melanoma in the murine model [279]

So, when you ask collagen and glutathione which is better, the honest answer is both, depending on your skincare goal