Potassium is a mineral found in varying amounts in almost all foods. Vegetables, especially green leafy varieties, are generally our richest sources of potassium. We list three excellent sources of potassium, 16 as very good sources, and 39 as good sources by our Nutrient Rating System. In other words, over half of our WHFoods provide you with significant amounts of potassium! In fact, all of our WHFoods contain at least some small but measurable amount of this mineral.