I tried taking this for a while, but found that I started having really bad headaches. I was taking a well known brand from Amazon. I couldn't be 100% sure the headaches were due to the Lion's mane, but felt better after I stopped taking it.

I was pretty bummed, I was hoping for a little boost from this as I had read good things about it, including the NIH articles you posted.

I can also confirm, finding the supplements that are not just mostly the ground brown rice flour is also a little difficult.