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The highest density of melatonin receptors (MT1) is in the suprachiasmatic nucleus or SCN

Denis, Effects of N-acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study., Redox Biology, Volume 6, 2015, Pages 198-205, ISSN 2213-2317

Also, people with diabetes who take a medication called metformin are at a higher risk of developing B12 deficiency because this medication can reduce B12 absorption

6 This suggests that glutathiones antioxidative properties can directly interfere with the viral life cycle, potentially reducing the severity and duration of cold sore outbreaks