I tried raspberry leaves too. Not even a hint on calming down (not talking about PRICE on those "natural" calming agents
). So I went with the old Calm&Cool (with valerian root). I actually don't give the full recommended portion (just 1 scoop/day instead of 2), but it seems to work. It takes couple weeks to take effect though. I also know at least 2 or 3 local people (who show) who use it on all their horses and swear it keeps them in good attitude all the time.