Castor oil?

Anyone try castor oil in their final weeks of pregnancy and it actually help induce labor? This has worked for my sister so she’s encouraging it. I’m over 38 weeks and I been experiencing so much early labor signs but just so afraid I’ll have to get induced again and I don’t want to have a C section. First was vaginal and induced. He was too big. Baby girl is measuring big too. Ahhh😭😩 I know it’s like a laxative and I have to stay hydrated but I read there hasn’t been any evidence it’s harmful to you and baby. Just want some feedback with people who have actually experienced castor oil.