s-acetyl glutathione oral bioavailability study Effects of N-acetylcysteine, (GSH) and a novel sublingual form of GSH on oxidative stress markers: A comparative crossover Enhancing the Oral Bioavailability of

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International journal of mass spectrometry 305 , 103109, doi: 10.1016/j.ijms.2010.09.008 (2011)