www.pubmed.gov glutathione Metabolism of the Brain—The Role of Astrocytes Vitamin C and glutathione supplementation:

The investigators reported partial restoration of the circadian melatonin rhythm in elderly subjects following the epithalamin course, with measurable but incomplete return toward younger-adult patterns of nocturnal melatonin secretion [2]

doi: 10.1016/s0076-6879(85)13054-5

Both studies found that the milk thistle extract silymarin has no benefits for the liver

Ans - Food sources help, but for noticeable skin and health benefits, supplements like Gluta One and Sip C are recommended

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doi: 10.1161/CIRCHEARTFAILURE.112.969576