Radishes are rich in antioxidants and minerals like calcium and potassium. Together, these nutrients help lower high blood pressure and reduce your risks for heart disease. The radish is also a good source of natural nitrates that improve blood flow. When eaten raw, radishes are spicy, crisp, and zesty. Varieties can range from very spicy (similar to the heat of raw garlic) to very mild – for example, Daikon radishes are milder than red radishes. Cooking brings out the sweetness and milds the spice.