glutathione peroxidase activity assay A validated method to assess enzyme | Chemical Papers It helps prevent lipid peroxidation of cellular membranes by removing free peroxide in the cell. Cell Glutathione Peroxidase (GPX) Activity

And it extended their life span

So if you are a vegan you may be more likely to become vitamin B12 deficient Medicines Certain medications can reduce the way that vitamin B12 is absorbed by your body, or make vitamin B12 deficiency worse

490,491 The UK Prospective Diabetes Study indicated a modest reduction in neuropathy risk with improved glycemic control

Seek medical advice if you are taking B12 supplements and experience: Persistent skin changes, particularly acne-like eruptions or rosacea worsening Unexplained headaches or dizziness that coincide with supplement use Gastrointestinal symptoms including nausea or abdominal discomfort Any allergic reactions such as rash or itching Call 999 or go to A&E immediately if you experience: Difficulty breathing Swelling of the face, lips, tongue or throat Severe rash or itching Other symptoms of severe allergic reaction after taking B12 These symptoms warrant review of your supplementation regimen