However, higher primates (including humans), most bats, guinea pigs, some fish species, and some bird species must acquire it from dietary sources because a gene for a synthesis enzyme has mutations that render it dysfunctional
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Alternative Skin Whitening Methods While injectable glutathione is effective, other skin-whitening methods can complement or serve as alternatives, including: Topical Treatments : Creams containing ingredients like kojic acid, arbutin, or retinol
(Phila.) 2019;57(6):380386
[11] For GPx activity, a coupled assay can follow NADPH oxidation at 340 nm, but blanks and non-enzymatic controls are needed