We have compiled a very comprehensive guide on Lions Mane mushroom and I highly recommend you check it out as there seems to be some confusion.
Beta-glucans are predominantly found in the fruiting body of the mushroom. There is no nerve growth factor in Lions Mane, but rather the compounds found in Lions Mane have been shown to promote the synthesis of nerve growth factor.
Erinacines may be found in the mushroom’s mycelium and also in the fruiting body at different levels, but erinacines don’t operate alone. The dual action of erinacines and hericenones is most likely the fuel that powers the many benefits of lion’s mane mushrooms. Four of the 11 types of hericenones currently known to science also boost NGF, and all four can be found in lion’s mane fruiting bodies.