★★★★★
I have suffered from extreme menstrual cramps for years. I started taking Omega 3 Fish Oil capsules for 1 week before my period started (the recommended dose on the label). The fish oil reduced my PMS symptoms, and my cramps were reduced by approx 80%. I didn't even have to take painkillers and I slept better too. NB - you need to start taking the pills 1 week before your period starts. It may be too late to start taking them when the cramps start.
Research on fish oil and menstrual cramps can be found here: http://www.oilofpisces.com/menstrualcramps.html