It can be found in nature - in green tea - but the version used in cosmetics is synthetic
Nutrients (2016) 8:156
Gall , Czkus Z, Bela K, Horvth E, rdg A, Csiszr J, Por P (2018) Plant glutathione transferases and light
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Furthermore, decreased folate levels, which potentially resulted in the accumulation of homocysteine and its subsequent conversion to cysteine, were reported to increase the positive correlation between plasma cysteine levels and the risk of breast cancer
Glutathione Synthesis The transport of the precursor amino acids through different specific amino acid transporters systems: alanine, serine and cysteine preferring (ASC), cystine glutamate preferring (X c ), leucine preferring (L) and asparagine preferring (N) is essential for GSH synthesis [7]