Intravenous glutathione achieves 100% bioavailability by entering the bloodstream directly, while oral glutathione typically exhibits bioavailability below 1% due to rapid hydrolysis by intestinal enzymes, according to a review published in MDPI Pharmaceutics
If you're switching from a pen to a vial or vice versa at a stable dose, expect no change in side effects
Long-Term Storage For long-term storage, freezing at -20C is recommended
outside of the published study, have you heard much about their use in osteoarthritis
Some plans might cover it, others wont
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