"The simplest form of magnesium is magnesium sulfate crystals. This is sold as Epsom Salts in every pharmacy and grocery store. This is straight magnesium and it is used as a laxative in the recommended doses. It is a pretty violent laxative too. However, in much less than laxative doses it can be mixed in water and taken to neutralize a food reaction.
For a laxative the recommended dose is "one to two teaspoons in water." For a food reaction I suggest a 1/4 to a 1/2 teaspoon in 6 ounces of water. There is only one problem with the Epsom Salts ... they taste like sudsy ammonia! It tastes SO BAD you would have to be quite desperate to use it more than once. I have a FEW patients who use it but they have life-threatening reactions and cannot take a chance on anything less effective. It is also the only antidote that will work below the stomach. All the others work only while the food is still in the stomach. So, if it has been over an hour since the food was eaten the stomach probably has emptied and in that case the other forms of magnesium will not be very effective."