One of the few studies that utilized exogenous glutathione used a combination of 1 g glutathione with 2 g vitamin C (another well-established antioxidant) daily for 7 days in trained athletes to test the possible effect on exercise-induced glutathione oxidation
Stupnisek et al., 2015) (see Therapy of Bleeding Disorders as Support )
For preclinical tissue models, stronger evidence would require standardized injury models, blinded outcome assessment, histological confirmation, functional endpoints, and comparison against appropriate positive and negative controls
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How do I know if Im deficient in Vitamin B12
Changes in levels of the antioxidant glutathione in brain and blood across the age span of healthy adults: a systematic review