glutathione skin whitening capsules side effects of glutathione!!? by Dr. Nakul Somani (Cosmetic & Plastic Surgeon) Glutathione Tablets For Skin Whitening:
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Bokovi M, Vovk T, Kores Plesniar B, Grabnar I

And I couldn't find a ton of data on it to support it, but there's

Many commercial formulations are stable at room temperature

Mutation of the GST gene encoding an antioxidant enzyme GST has been revealed to be associated with increased glioma risk