However, I trust IOPE for various skin-care categories (retinol, especially), so why not vitamin C
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Cysteine is the rate-limiting factor in cellular GSH synthesis, since this amino acid is relatively rare in foods
NAC Dosing (as Glutathione Precursor) General antioxidant support: 600-1,200 mg/day in divided doses [9][18] Respiratory conditions (COPD): 600-1,200 mg/day (PANTHEON trial used 600 mg twice daily) [43][44] Psychiatric conditions: 1,200-2,400 mg/day (most trials used 2,000-2,400 mg/day) [72][73][74] Male fertility: 600 mg/day [69] Immune support in elderly: 600-1,200 mg/day [40] GlyNAC Dosing The Kumar et al
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This clinical study shows that oral GSH has low bioavailability compared to other modalities like sublingual