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Gregus Z et al
Injectable and IV routes dominate because standard oral glutathione has very low bioavailability it's largely degraded in the gut before reaching circulation
But for most purposes (like weekly maintenance injections), IM is the preferred route at home because its simpler (the vitamins absorb quickly from muscle into the bloodstream over a few hours)
Many patients notice improved skin quality and faster recovery times
Signs of B12 deficiency include fatigue, brain fog, poor concentration, and low energy
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