Carnitine supplementation (3 g/day) is an excellent nutrient way to rid the body of excess ammonia, so if you are concerned about excess ammonia leading to neuronal toxicity, I would use carnitine with glutamine. There have been liver failure patients, by the way, who have had their ammonia levels drop markedly on carnitine supplementation and one of them walked out of a hospital in Germany when she was expected to die. Such is the power of carnitine to lower ammonia!
I don’t know if in the last 15 years or so this still has been used of if there are new data!?