Glutathione Injection Cost, Benefits, Side Effects Effects of N acetylcysteine, oral glutathione (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover study. ScienceDirect Myth 4: Oral supplements are just as effective as IV drips., Lets set the record straight., While oral glutathione supplements may seem convenient, they often lose potency during digestion, meaning Enhancing the Oral Bioavailability of Glutathione Using Innovative Analogue Approaches