You may want to look into the RDA of potassium. Unfortunately, many vitamin supplements do NOT include nowhere near enough potassium,(like 2% :eek: ) so don't think you getting it from your multi, that goes for magnesium too. Many people don't think they lack these minerals because they think it's already included in their multi vitamin.
You should be consuming more fruit for potassium,
Bananas are high in potassium, same with pineapple, oranges, ANY fruits.
I think milk has some potassium, but I'm not sure.
For magnesium, well, today's soils are depleted from this essential mineral so more people lack this mineral than believed. Foods higher in magnesium are in whole grains, leafy greens, nuts, flax, and there is more I think.. :)
Check to make sure your getting enough iron, and B vitamins.