I just wanted to share my experience of evening primrose oil, when I first started my period age 10 I had really irregular cycles, anything from 35 days to sometimes not having a period for months. I had the most awful PMT, which was so bad and I slammed my door so much I cracked all around the door frame, I had uncontrollable rages and I'm not proud of it I can tell you. I also suffered with painful breasts before periods. Now back then Evening primrose oil was available on prescription, it was called Efamol. My Gp put me on these, I had to take 8 capsules a day, they took a good 8 weeks to start working but by god did they work, my PMT totally disappeared, breast tenderness gone, and cycles became a normal 28 days, absolutely amazing results. Would you believe they then removed them from prescriptions as they said there was not enough proof that they worked ! x