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Oral glutathione has poor bioavailability due to digestive enzymes

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Research shows they can induce abnormal vitellogenin expression in male fish and cause testicular structural alterations and reduced reproductive capacity, suggesting potential systemic and long-term impacts on aquatic environments [55, 56]

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Increase of organic acids and coenzymes In the present study, we identified other classes of compounds that underwent significant changes, such as purines and pyrimidines, coenzymes, organic acids, anti-oxidants, and sugar metabolites (in plasma, not RBCs), revealing hitherto unrecognized aspects of fasting