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>if you try to buy potassium supplements, the max dosage you can get over the counter is 99mg

I had no problem buying potassium (gluconate) powder by the pound off of Amazon for cheap. (I am in the US.) Be careful with it because if the ratio of potassium to sodium in your blood gets too high, it interferes with the mechanism that sequences the contractions of the chambers of the heart or such.



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