Frontiers Gut microbiota and autism spectrum disorder: advances in dietary intervention strategies based on the microbiota gut brain axis mechanism 87 studies. 9,000+ children. and most parents have never heard this conversation. A meta analysis of 87 studies involving over 9,000 children found consistently lower glutathione levels and higher oxidative stress in children The impact of glutathione metabolism in autism spectrum disorder ScienceDirect Leucovorin and Autism Spectrum Disorder Emerging Clinical Insights Evidence of microglial activation in autism and its possible role in brain underconnectivity Neuron Glia Biology Cambridge Core