Based on this blog.
link1: lion’s mane mushroom improved brain cell growth and memory in pre-clinical trials.
link2: I didnt know Killifish can regenerate part of their brain. As they age this ability is lost because (like other animals) we tend to accumulate dysfunctional cells with age, called senescent. By using senolytics in old killifish, they were able to restore some of the amazing regenerative abilities.