intracellular glutathione reduction Glutathione-responsive nano-vehicles as a promising platform for targeted drug and gene delivery which makes it a powerful sulfur Glutathione: A Little Miracle for
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doi:10.1139/apnm-2014-0073 MedlinePlus

doi: 10.1016/j.tins.2012.11.008

Could be useful evidence to show GP of symptoms returning before next injection

The exception to this is if someone has iron deficiency-related hair loss, and if their iron deficiency is exclusively the result of poor hemoglobin production due to a vitamin B12 deficiency