See the 'question of lithium' thread for much more background in the potential depths of the situation.
Careful, it is 'difficult to negotiate' information in some respects (in the mentioned thread), but much of the other side of the given coin is also presented. For example, the "explanations"/musing in the thread can also potentially explain yeti and the Sasquatch. (about 'hair')
It may be that lithium is not 'bad for you' at all, in fact, it may be the opposite. Some bits of thinking will need be done, here.
if it turns you into a cow, then, IMHO, it is bad. If it opens dimensional doorways, in a 'correct manner' (whatever that means) then it is a good thing, IMHO.