What's the Recommended Amount of Potassium Most Adults Should Have Each Day? Potassium is so important to your heart's health, so, what's the recommended amount of potassium most adults should have each day? 2.5 grams, 3.5 grams, or 4.5 grams? 3.5 grams is the daily value for potassium and the amount represented on the Nutrition Facts panel on foods and beverages. Potassium is a mineral, considered an electrolyte, which has many functions and is found in many foods, especially fruits and vegetables. One of the most important functions of potassium is to keep your heart beating regularly. Its role is to maintain fluid balance and helps nerves and muscles work properly. As you can imagine, without the proper amount of potassium your body may not be able to function at its optimal level, which is one reason the kidneys help maintain the correct level of potassium in the blood. There are many foods that contain potassium, such as: meats, fish, vegetables, fruits, and some dairy products. Potassium plays several key roles in the body: Helps regulate the body's acid-base balance Assists in protein synthesis Helps build muscle Assists in the regulation of your heart's electrical activity