Raw parsley is an excellent source of:
Protein
Vitamin E
Thiamine
Riboflavin
Niacin or vitamin B3
Vitamin A
Folic acid
Potassium
Because of its strong antioxidant and mineral content, parsley can help improve general health. It contains a variety of vitamins and minerals, including:
Vitamins A, K, C, B1, and B3
Folate
Iron
Copper
Fiber
Zinc
And many others
Parsley improves urinary tract, renal, and digestive health. It's great in sauces, soups, and stews. It may be finely minced and rubbed on meats before cooking. Add parsley to pesto and salads for added health benefits, and it is commonly used as a garnish in most diets.
Parsley works as a powerful natural diuretic and can help reduce bloating and blood pressure. Parsley is loaded with vitamin K, which has been linked to bone health. The vitamin supports bone growth and bone mineral density. 
Parsley helps prevent the formation of stones in the kidneys by making urine more acidic and acting as a diuretic, which increases urine production. Drinking parsley tea can help the body flush out excess toxins, fats, salts, and water and thus reduce strain on the kidneys.