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Most prior studies demonstrate extensive inter-subject variation in plasma concentrations following oral administration of NAC [14,67] which would put forward the inhalation route as a preferred method for treatment of acute respiratory conditions

These products are not drugs, foods, cosmetics, diagnostic products, or dietary supplements, have not been evaluated by the FDA, and are not intended for human or animal use

[PMID: 33106987 DOI: 10.1007/s10930-020-09935-8] [DOI] [PMC free article] [PubMed] [Google Scholar] 38.Crapo JD

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Potential Side Effects and Safety Considerations Vitamin B12 injections are usually safe but can have side effects