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The FDA explains that compounded drugs are not FDA-approved , meaning the agency does not verify their safety, effectiveness, or quality before marketing (see Compounding and the FDA: Questions and Answers )
doi:10.1016/j.bioorg.2019.103199 Kellermann AJ, Kloft C
Clinical evidence supporting this is mixed: IV glutathione shows consistent benefit in controlled trials, while oral forms show almost none unless formulated for enhanced absorption
doi: 10.3389/fnbeh.2023.1151918 246
Antibody responses to viral infections: A structural perspective across three different enveloped viruses
