No clue where to put this, sorry!

I've looked quite a bit on the internet and haven't been able to find anywhere that says how many mg of the Red Raspberry Leaf capsules to take a day. Some people say their midwives want them taking 4,000 mg, some say 900 mg, some just quantify it in number of pills. Does anyone have any information from their midwives about this? My OB doesn't like to recommend supplements aside from prenatals or else I'd ask him.

ETA I'm 36 weeks, 37 on Saturday.