Was reading the wiki and it said that they were poisonous but when I tried to boil them I was unable to put them into the pot. I've noticed that other mushrooms that are not poisonous you cant boil them either so am I right to assume this one is not either?
Just ignore poison. Make a berry mash do your gluttony session then eat the berry mash a minute later you will be back to where you were. I have personally seen a 150+ character with 1 to all biles ate a berry mash and was back to all good within 4 minutes.