Lion's Mane mushrooms contain a group of compounds that are able to regenerate the myelin sheath on the axons of neurons. It is a great mushroom for people suffering from Multiple Sclerosis, where the myelin sheath degenerates.
It's also great for Alzheimer's, Parkinson's, depression, PTSD, and many other neurological disorders because of its ability to regenerate and redirect our existing neural pathways.
Hericium erinaceus - Wikipedia
https://en.wikipedia.org/wiki/Hericium_erinaceus