According to SFGate, it is completely safe to eat watermelon seeds, and roasted watermelon seeds in particular provide a number of health benefits. Roasted watermelon seeds are a healthy source of unsaturated fats and essential minerals, including iron, magnesium and copper. These minerals help promote healthy body tissue and they resist diseases.
An ounce of watermelon seeds contains almost 2 milligrams of iron, which is 11 percent of the recommended daily value for women and 25 percent for men. Iron supports the immune system, increases liver function and aids in the production of both hemoglobin and myoglobin, proteins that assist in the transportation and storage of oxygen in body tissues. Roasted watermelon seeds are also a healthy source of magnesium, which supports metabolism and energy levels. Magnesium aids in cell migration, cell communication and the production of lipids, which help the body store energy. Watermelon seeds are a good source of copper, which nourishes hair and skin. Copper aids in the production of melanin, giving hair and skin their pigment and protecting the body from the sun's harmful UV rays. Roasted watermelon seeds can be prepared and served in a number of ways, such as adding a mix of lime juice and chili powder or a sprinkle of cinnamon for a sweeter flavor. The seeds can also be added into salads or trail mixes.