Many brands are bad and made from mycellium (the growing "block" which is rice) instead of the actual fruiting body of the mushroom so they don't really contain any of the active ingredients. Also it's supposed to build up on you not really have a noticeable instant effect, more likely you'll notice something after 2-4 weeks or so. Caffeine and some mushrooms like cordyceps for example don't do well together, they compete for absorption in the body and caffeine cancels out the effects. Not sure if it affects lion's mane.
I've been reading a lot about it and just ordered some from oriveda a couple days ago. Pretty expensive bit have high hopea for it. Check out https://old
. reddit. com/r/MushroomSupplements/comments/h090ry/lions_mane_best_supplements_how_it_works/ if u want a good read about general stuff just remove the spaces in the url