In their excellent book The Art and Science of Low Carbohydrate Living: An Expert Guide to Making the Life - Saving Benefits of Carbohydrate Restriction Sustainable and Enjoyable, Drs. Jeff Volek and Stephen Phinney recommend taking 3 slow release magnesium tablets such as Slow - Mag or Mag 64 for 20 days, then continuing to take 1
tablet a day afterwards.