I've talked to my OB about it and read up on it tons.
It doesn't induce labour, but it has shown to help with uterine tone and therefore harder/shorter labour.
it IS Red Raspberry LEAF tea, and really, if you are drinking the correct stuff, and not just raspberry tea, it doesn't taste like raspberries at all, more just like stewed leaves.
A friend of mine was drinking it THROUGH labour and they asked what it was in L&D and told her to stop because it has been known to hinder active labour when being drunk during the time of labour.
hth