raspberry leaf capsules

I eventually got round to getting some raspberry leaf capsules yesterday. The bottle says take 1 twice a day. I have read that if you are taking it in tea form you can gradually increase the dose until you are having quite a few cups a day. Can you also increase dose with capsules or is it safer to stick to what it says on the bottle? What have other people done and do you think they work?
Alison 37+5 xx