I extracted all the red ones from a tube of Smarties and put them into a brown aspirin bottle. I was academic tutor to a group of first-year undergraduates at the time, and at our next meeting, I put my watch on the table and every ten minutes I uncapped the bottle and took what looked like a large red pill. There were some funny looks, but it was nearly an hour before one of them plucked up the courage to ask me if I was all right.
I don’t see why this should not work in an office, but I dont think I would try it on a bus or train.