The clinical evidence base supports its use as a tool for maintaining antioxidant status, supporting liver and immune function, and reducing oxidative burden, particularly in individuals whose endogenous production is compromised by age, chronic stress, illness, or inadequate nutrient precursor availability
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Real-Time Example / Study Highlight Heres a practical study you can point to: In the study Glutathione and its anti-aging and antimelanogenic effects (Chulalongkorn University, Thailand) healthy female subjects received either 50 mg/day of reduced glutathione (GSH) or oxidised glutathione (GSSG) or placebo over 12 weeks
doi: 10.4049/jimmunol.142.12.4261 174 OtsukaKSatoMTsunematsuTIshimaruN
How to implement: Dosing: 20-40 grams daily (post-workout or as snack) Choose undenatured whey (cold-processed, preserves bioactive peptides) Whey protein isolate (higher protein content, lower lactose) Best sources: Grass-fed whey isolate : Highest cysteine content Undenatured whey concentrate : Preserves immunoglobulins and glutathione precursors Avoid heat-treated : Heat denatures cysteine Timing: Post-workout (supports muscle recovery + glutathione synthesis) Morning (with breakfast) For vegans: Pea protein isolate : Lower in cysteine but can be paired with NAC Hemp protein : Moderate cysteine content Evidence: A randomized trial found that 20 grams of whey protein daily for 3 months increased lymphocyte glutathione by 35% and improved immune markers in HIV patients [15]
