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for example, valproic acid raises ammonia levels, and added glycine could theoretically exacerbate hyperammonemia

Administration of NatuREN G, an innovative synbiotics mixture comprising Bifidobacterium animalis , BLC1 (10 9 cells), Lacticaseibacillus casei , LC4P1 (10 9 cells), fructooligosaccharides (2.5 g), inulin (2.5 g), quercetin (640 mg), resveratrol (230 mg), and proanthocyanidins (13 mg) to stages IIIb-IV CKD patients for 3 months reveal an increase in the ratio of Firmicutes/Bacteriodetes in the synbiotic group (Celano et al., 2023)

McGraw-Hill/ Lange

You might find that standard L-glutathione is more common and less expensive

Raad G, Tanios J, Kerbaj S, et al