i take evening primrose oil too, but i don't take it too often (like not around my period like you are supposed to) so I don't know how well it works for period troubles- i should probably start taking it more! anyways, the oil is also a source of omega 3 or 6...can't remember which and the capsuls usually have vitamin E in them too- all those things are great for us, not to mention easing cramps and shit.