I don't think raspberry zinger has very much leaf...its the last ingredient listed. It sure is yummy tho! There are lots of Pregnancy teas available which have RLT as the main ingredient. That would probably be more effective. I love my custom mix which includes RLT, nettle, alfalfa, oat straw and mint.
You should try a health food store and get raspberry leaf tea. It tastes like green tea. It strengthens your uterus to make contractions more effective. I used it my last pregnancy and my labor was great
For my last pregnancy in my 3rd trimester, I started drinking the Earth Mama Angel Baby Organic Third trimester tea which is essentially a raspberry leaf tea as I heard it tones uterine muscles. I had a relatively smooth and quick delivery.
My husband purchased me the same kind of tea i drank 2 cups but nothing happend i just wanted to throw it up and im due on Sunday Valentine's Day