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Mercury in Dental Amalgams: A Great Concern for Clinical Toxicology in Developing Countries?, 2018,

However, the "protective" benefit of glutathione is less utilized at night compared to the daytime when you are exposed to environmental toxins

GHK-Cu is predominantly found in saliva, blood, and urine, and has multiple biological actions when administered to test subjects, including [1]: Antioxidant gene activity [2] Suppression of inflammatory cytokine interleukin-6 [2] Increased protein accumulation [3] Increased collagen synthesis [3] In animal models, GHK-Cu has been shown to increase an anti-inflammatory proteogly called decorin that can protect diabetic rats from kidney-damaging fibrosis [2, 4]

They also show antioxidant and anti-inflammatory properties, supporting protection against oxidative stress