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It has been observed that vitamin B12 also has antioxidant effects when it gets absorbed, and it is used as a cofactor for enzymes that are involved in the synthesis of deoxyribonucleic acid (DNA), fatty acids, and myelin
Excessive skin lightening: In some cases, glutathione may lighten skin more than intended - particularly with aggressive or prolonged dosing beyond what was planned
Long-term abuse, especially by injections, might, however, damage organs or produce pigmentation problems that need medical attention
World J Clin Pediatr
However, if supplementing for confirmed deficiency, follow-up blood tests may be arranged by your GP to ensure adequacy of treatment