Actually it's lack of potassium that causes my heart palpitations rather
than lack of magnesium, but they both work so hand in glove. Magnesium is
particularly effective for my chest tightness.
 
Cheap, easy magnesium for this purpose: Magnesium Citrate.
 
Cheap easy potassium for this purpose: Potassium Chloride in the form of
Salt Substitute, in any grocery store.
 
Daddybob

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10:36 PM