To remove anything unnecessary, as to see if that's affecting him.
Ok. Stopped taking it.
It can't hurt, you should keep a full diary for a few weeks, if there's a pattern it'll show itself. Track everything - activities, bathroom, bedroom, everything you eat. It could be something strange like an ingredient from the taco shack you go to every time you go surfing, or if it is surfing itself at least you'll know.
That's a good idea, I'm going to start tracking it in my diet log.