The only mechanism of potassium lowering comes from people who are severely anemic. The introduction of B12 to these patients results in rapid red cell formation in the bone marrow and these cells grab lots of potassium.

In others with normal red cell counts, it is not likely that potassium levels will be affected.

Potassium OTC is regulated by the FDA at 99mg a tablet. Most food sources are far higher than that. So getting potassium from food, is best. A can of V8 is about 800mg by comparison.

If you suspect low potassium it is best to get that tested by a doctor to see if it is really low and by how much...then figuring out whether a RX for potassium is needed and having the doctor prescribe the correct dose.

Type into Google.... "potassium content of foods"... potassium is pretty commonly available and only if a person has chronic diarrhea or is taking a diuretic does it become low.

The new daily suggested intake from food is 4,500 mg a day.