I agree with chris - I take vitamins and supplements too, and I pack them in the 7-day organiser in my hold baggage, because it wouldn't be distastrous if they took them off me for analysis. However as Chris says, if you turn up with a strip of white tablets etc in an organiser, they could be anything, and it would be awful if they took them off you. Much better just to take with you as many prescription doses as you need, and squash up the box so it doesn't take up too much room.