Here are a few studies of things that can help your friend, at least a bit:
https://medicalxpress.com/news/2023-06-omega-fatty-acids-linked-slower.html
https://medicalxpress.com/news/2022-12-probiotic-als.html
https://medicalxpress.com/news/2022-08-repurposed-drug-patients-motor-neuron.html
https://medicalxpress.com/news/2022-05-c9orf72-linked-dementia-mutant-mice-antibiotic.html
http://www.eurekalert.org/pub_releases/2010-12/uosf-bat122110.php
Thank you! I’ll definitely pass those along!