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(Source 3) You can support healthy glutathione levels with dietary measures and including the following foods in the diet: Protein, especially whey protein Brassica vegetables (broccoli, brussels sprouts, kale, cauliflower, collards, etc.) Green tea Polyphenols from fruits and vegetables Glutathione-rich foods: avocados, spinach, asparagus, cucumber, green beans (Source 2) A nutritious diet is foundational in the functional medicine approach

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The melanin indices decreased consistently at all six sites in subjects who received glutathione indicating a lightening of the skin

Its not FDA-approved, and selling it as a drug or supplement in the US isnt legal (source)