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Delivery method matters: subcutaneous (injectable) glutathione and nasal sprays bypass digestion, which may support better absorption than oral glutathione

If systemic reach for a specific therapeutic goal is genuinely what you're after, that's a different conversation to have with a doctor

Rather, we want to use it to investigate the qualitative features of glutathione metabolism in the normal state and in various disease states

Bottom line: Choosing a supplement with high bioavailability means you can take smaller, more effective doses that actually reach your cells, rather than relying on high-dose powders that mostly go to waste