This mineral is crucial for your whole body. It helps keep your blood pressure normal, bones strong, and your heart rhythm steady. There are some studies that suggest it can also improve OAB symptoms by reducing muscle spasms and allowing your bladder to empty completely. While more studies are needed, you can add magnesium-rich foods like kale, bananas, cashews, and pumpkin seeds to your diet if your doctor says that’s safe for you. If, for example, you have kidney disease, certain foods may not be safe for you.