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doi:10.1016/j.endmts.2025.100228
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While L-cysteine plays important metabolic roles as a key antioxidant, a glutathione precursor, and a natural source of sulfur for metabolism, it is unstable and can become degraded during absorption
Some biomarkers (oxidative stress, antioxidant capacity) may shift within 24 weeks, while functional improvements may take 812 weeks or longer depending on dose, route, and baseline status
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