Needto, just because you get the jitters for a few hours after you take them and they go away, that doesn't mean it's not in your system anymore. it has a half life of 48 hours, so once a day is fine I would believe.
BodyND... test it out. one week take it all in the AM. the next week take it AM and then in the afternoon.
If you loose the same amount of weight or bf, then it won't matter.