I seem to be mildly allergic to lion's mane mushroom (and other mushroom derived supplements). Is there another supplement that does what lion's mane does for the nervous system?

There is a supplement by Premier Research Labs called Neuroven which must be taken with Cereven for both the brain and nervous system. If you go this route, you would take 1 of each supp per day for 60 days. These are very therapeutic for nerve health.

Otherwise you will just need to leave the Lion's Mane out of your protocol.