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Your body makes some antioxidants, but others come from external sources like diet or supplements like glutathione

Prior exercise and antioxidant supplementation: effect on oxidative stress and muscle injury

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B12 deficiency can also be an issue if you have had weight loss surgery, have a very poor diet, or follow extreme or restrictive diets for a long time

Even if a person is not deficient in Vitamin B12, as defined by a blood test, the symptoms of a B12 deficiency may include: Feeling weak or tired Problems with vision Headaches Pins and needles Reduced mental functions Wish to check you vitamin B12 levels