On your nutrition tracker page, there's a link near the top to "change nutrition goals". Clicking that link takes you to a page where you can add any of dozens of nutrients for your nutrition tracker to calculate. Examples are calcium, iron, magnesium, sodium, potassium, glucose, sucrose. The additional nutrients show in the chart at the bottom of your nutrition tracker page and help you watch your daily intake.
Knowing something about psychology, I know it's important to get correct proportions of sodium, potassium, and calcium for proper brain function - and body. I started tracking those nutrients and am amazed at how out of proportion my intake was. Eye-opening! At least knowledge is power!