SAM-e made me as angry as The Hulk on crack.
Interesting.. I recently had to deal with a bout of intense moodiness, depression, and serious irritability after stopping SAM-e. This is pure conjecture though and I hesitate to mention it so take it for what it is.. an anecdote. I was taking 400mg daily for 2-3 weeks and felt it did perk things up a bit (I ordinarily don't have depressive symptoms other than what the state of the world brings). After I stopped (just sort of felt the experiment had run its course) these feelings set in maybe 3-4 days later. Not fun.
I've been dosing fairly heavily with B supplements and it seems to have moderated the mental state or perhaps my brain chemistry balanced on its own. I know SAM-e is supposed to deplete levels of folic acid and I stupidly did not co-administer as recommended but I would have to imagine if SAM-e was causing the problem I would experience negative effects during its use.. so perhaps this was withdrawal.
However there are many variables in the mix including the changing season, some pot brownies a friend gave me that had a disagreeable cannabinoid distribution (resulting in paranoia while trying to fall asleep). So.. who knows. But I've dealt with the downsides of THC before.
And, of course, there are forums on the internet where people blame SAM-e for all sorts of ills -- either during administration or during "withdrawal."