You can eat it raw as a snack.
Watermelon seeds are full of nutrients: proteins, vitamins, omega 3 and omega 6 fatty acids, magnesium and zinc, copper, and potassium. With magnesium, it helps your body maintain good nerve and muscle function, as well as strengthen immunity, heart and bone health. It provides iron which is an essential component of blood's hemoglobin, carrying oxygen throughout the body. It is a great source of good fats, as well.
Storage: Store in an airtight sealed bag in a cool dry place. For best quality, refrigerate after opening.
Shelf life: 1 year unopened in the fridge, 6 months after opening.