when my problem started after a virus
cold last October, I had a headache for 3 weeks straight. There was a bottle of Mg Citrate on hand from a drugstore, I sipped that throughout the day, plus put epsom salts in a a foot bath. Within a day or so, my headache was gone. I later got the powders online, but after 2 months mostly stopped using it. One month later, when I had the skipped beats, I began using the Mg powder again intensively, along with rehydrating.