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If any side effects are experienced, they are mild and reversible
They might get dizzy, have cold hands and feet, or have headaches
Those with a diagnosed deficiency - usually through a symptom checker alongside a simple blood test - will be prescribed and offered regular vitamin B12 intramuscular injections through their GP practice, district nurse, or NHS services
More than 98% of total glutathione is present as GSH and the rest is found as the oxidised form, glutathione disulfide (GSSG) or a range of glutathione-S-conjugates
10.1111/jpi.12525 J
Yahia-Ammar, A., Sierra, D., Mrola, F., Hildebrandt, N
