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10.1016/j.jep.2023.117556 36 WeiM.ZhengZ.ShiL.JinY.JiL

Common Causes of Peptide Degradation Many different processes and factors can affect peptides: Peptide hydrolysis caused by moisture exposure Oxidation resulting from oxygen and exposure to light Changes in temperature Bacterial degradation in peptide solutions Contamination during laboratory handling Repeated freeze-thaw cycles (Sigma-Aldrich, 2023a

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Patients with low levels may experience: Chronic fatigue Weakness Headaches Dizziness Problems sleeping Frequent illnesses Dermatitis Difficulty concentrating Painful joints Mood instability or depression There are also many chronic health conditions which are associated with low glutathione levels