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GPX7 and GPX8 also have cysteine as their active site and low glutathione peroxidase (GSH) activity, mainly due to the lack of domains bound to GSH
Whether to use one or both will depend on your primary concerns and tolerance for these ingredients
L-Cystine paired with Glutathione provides better whitening
When you take glutathione orally, much of it is broken down in the digestive tract before it can be absorbed, meaning you get only a fraction of the intended benefits
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