Does l-gluthatione interfere with benzos and if yes, in what way ?

No, it does not: No, glutathione does not interfere with benzodiazepines. It may help you though, especially if you've been chronically ill, or simply depleted due to poor diet, pollution, toxins, medications, stress, trauma, aging, infections and radiation. http://www.huffingtonpost.com/dr-mark-hyman/glutathione-the-mother-of_b_530494.html.

L-glutathione: There are no known interactions between l-glutathione and benzodiazepines. Glutathione appears safe when taken orally, and when used by physicians im or iv.