Book arrived quickly, easy to understand.didn't really believe it would help as I have suffered from migraines for 30 years and have tried numerous drugs and alternative therapies. However, whether coincidence or not,since taking magnesium & B2 (I left out the feverfew as I had no previous success with it) my migraines have been greatly reduced,and also my medication.It has been 3 months now so I am continuing with it.I take 300 mg of magnesium and 50mg of B2 daily, as the doses in the book seemed quite high.It works for me at the moment!