Glutathione not only has a role in the skins melanin formation, it can also interrupt the enzyme that causes melanin overproduction
doi:10.1016/S0026-0495(96)90171-7
Activation of -catenin in a genetically engineered melanoma-susceptible mouse model expressing the B-RAFV600E human mutation together with melanocyte-specific Pten loss resulted in uniform melanoma hyperpigmentation and a more aggressive phenotype 44
Vzquez L, Flrez AB, Verbruggen S, et al
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Flavin Nucleotide Metabolism in Plants: monofunctional enzymes synthesize fad in plastids