1000 mg glutathione per day for skin lightening: a regnant myth or evidence-based verity? Glutathione Dosage Per Day: Recommended
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But is there any truth to the idea that B12 helps with weight loss

Immune System Boost: Fortifying Your Body's Defenses Glutathione is essential for a robust immune system, with reports suggesting glutathione-aided increases in natural killer cell activity that improves resistance to illness

P., Gurevich V

Statistical analysis was performed by one-way analysis of variance (ANOVA) followed by Tukeys post hoc test using Minitab 16 and Students t-test