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This endogenous synthesis is crucial because it successfully crosses both cellular and mitochondrial membranes, delivering antioxidant protection exactly where the electron transport chain needs it most

Injection site reactions : Localised redness, swelling, or discomfort at the injection site

Maintain (Weeks 58): Hold at 50 mcg daily

Vegetarians and vegans focused on general wellness, rather than a specific medical concern, are another group where this often fits well, given typically lower natural cysteine intake from a plant-based diet

Medical review matters because dosage, source quality, health history, and treatment goals all affect risk