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l glutathione pills dosage Healthy Nutrition L-Glutathione Capsule (90 Each) L-Glutathione — Natural Health Improvement
Description
So this is the best evidence of its positive effects!

Further, NICE and the BNF says that if there are neurological symptoms present, then every other day injections are the recommended treatment, so all the points you make about B12 being stored and sufficient are not really relevant

R., Xu, Y

Bibcode:1974PNAS...71.3879H

(2016, Indian Journal of Dermatology, Venereology and Leprology ) the most comprehensive published review on this topic concluded that the evidence for intravenous glutathione as a skin-lightening agent remains limited and of low quality
