Castor oil to induce labor?

I am 39 weeks pregnant and absolutely miserable (as most women are at this point in pregnancy). I have been in false labor a few times and ready to go! I am about a cm dilated. My doctor is going to strip my membranes Monday and I would like to go a more non-invasive way. I walk, stimulate my nipples and everything else. I have started the evening primrose oil and raspberry leaf tea. I am more interested in castor oil. On one hand, I hear that it works. On the other hand, I hear that it can cause meconium to go into the amniotic sac. Wondering how effective/ safe castor oil is. Any midwives around? Looking for someone who is not just clinical/ medical. Thanks.