Over the years, parsley has been used to treat conditions like high blood pressure, allergies, and inflammatory diseases. Often labeled as one of the most powerful disease-fighting plants, parsley provides great nutritional value and offers many potential health benefits. Parsley is also a great source of vitamins A and C — important nutrients with antioxidant properties Additionally, it’s very low in calories yet packed with flavor, making it a great low-calorie ingredient for many recipes.