For example, one clinical review noted that orally administered glutathione cannot be relied upon for therapeutic purposes, whereas IV or certain novel routes are needed for significant increases
doi: 10.1056/NEJMoa1712191 49
In comparison, the IV drips takes longer as it relies on gravity, although the dosage rate can be controlled more minutely by monitoring the drops per minute
Moreover, if your prescription is missing key details (patient name, prescriber details, date, dosage instructions), verification may take longer
Some practitioners recommend NAC alongside or instead of direct glutathione supplementation, especially for long-term use