How to take Evening primrose oil?

Has is everyone taking it? I never used it with my first but I’d liked to use it this time especially with baby measuring bigger and a week ahead, I’ve heard it can help make an easier labor similar to the raspberry leaf tea.

Also when did you start taking them? I just don’t want to go over 40 weeks but I don’t want to start them to soon. 36 weeks but I was thinking of waiting until 38-39 weeks?