Black-eyed peas are especially rich sources of potassium. This mineral is important for the proper function of all cells, tissues and organs in the body. It is also crucial for heart function and plays a key role in muscle contraction. Healthy adults over the age of 19 need at least 2000 milligrams per day, and black-eyed peas provide over half that in one serving (1148 milligrams).Black-eyed peas do contain a small amount of naturally occurring sodium: 48 milligrams. However, because of their other heart-healthy nutrients, legumes are encouraged for even those with cardiovascular disease or high blood pressure.Zinc is another mineral found in black-eyed peas. Zinc is involved in many aspects of cellular metabolism, and is therefore essential for the immune function, protein synthesis, wound healing and healthy cell division. Black-eyed peas provide five of the 8-11 milligrams of zinc that is recommended each day by the Food and Nutrition Board of the Institutes of Medicine.Most beans, including black-eyed peas, are a rich source of iron. Iron is an essential component of one of the proteins found in the red blood cells which carry oxygen to all body tissues. Black-eyed peas contain 6% of the daily value of iron in the form of non-heme iron. The peas also contain 1.3 milligrams of vitamin C which helps the body absorb non-heme iron.