impaired glutathione synthesis b12 Glossitis and hyperpigmentation of hands due to Vitamin deficiency. ⬇️ B12 leads to ⬆️ melanin more frequently in people with darker skin. Skin hyperpigmentation was reversed with B12 replacement Vitamin B12 deficiency causes and
Vitamin B12 deficiency causes and symptoms The Glutathione System: A New Drug Target in Neuroimmune Disorders Molecular Neurobiology Springer Nature Link Vitamin B12 and Methylation Nineteen year follow up of a patient with severe glutathione synthetase deficiency Journal of Human Genetics
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