Thoughts on evening primrose oil & it's benefits for PMS? I suffer from bad mood swings and I put on about half a stone of water everytime I PMS without even exaggerating. I'm on the implant so am already on HBC to try lessen the symptoms without avail. Have heard evening primrose oil is good for hormone levels but as it is around 6 pound a bottle (can't swallow tablets) I don't want to waste my money if it doesn't work!! Any advice?