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As an aside, we are unsure if the fatigue is purely down to B12 deficiency or if its long covid" If your B12 deficiency is not due to diet, I'd expect GP to at least test you for PA and Coeliac disease, two autoimmune conditions that can lead to B12 deficiency

During aging the GSH content was decreased in the liver, lung, kidney, red blood cells, spleen lymphocytes, cerebral cortex, and cerebellum

FDA in 2014

Research published in Plastic and Reconstructive Surgery demonstrates that topical glutathione treatment in ischemic wound models significantly reduces oxidative stress and reestablishes the matrix metalloproteinase-1/tissue inhibitor of metalloproteinase-1 (MMP-1/TIMP-1) ratio, enabling adequate extracellular matrix production and reepithelization