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However, not all gut microbes are beneficial, as studies have shown that the gut microbial metabolite Levodopa (L-dopa) is capable of decreasing drug availability and causing side effects (Spanogiannopoulos et al., 2016), and accurately identifying beneficial and harmful microbes remains an important area of interest in the treatment of disease with gut microbes (Maini Rekdal et al., 2019)

Guide for the Care and Use of Laboratory Animals, 8th Edition

Studies show effervescent formulations achieve 161% relative bioavailability compared to conventional tablets meaning you absorb significantly more.[11] But not all effervescent glutathione is created equal