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Without pharmaceutical regulation, products vary enormously in purity, potency, and safety

Morgan DL, Ortiz C (2011): Nuclear, Biologic & Chemical Agents

Standard oral glutathione has very low bioavailability and may take months to show results, whereas liposomal delivery is designed for rapid absorption and can show effects much sooner

doi: 10.1093/asj/sjad211

The possible reason is that Ferr-1 can stabilize the intracellular iron pool, but has a limited effect on the uptake and transformation of iron ions, so TFR1 and DMT1, which transport iron into cells and affect the valence state of iron ions, have limited changes