It has been used for such conditions as hypertension and congestive heart failure - however, because of the seriousness of these illnesses, parsley should never be used without the advice of a physician. Since both apiol and myristicin are uterine stimulants, medicinal dosages should not be used during pregnancy as it could cause excessive stimulation of the womb. Because of this, parsley infusions have been used late in pregnancy to induce labor. In other words, parsley may help to ease flatulence and the colic pains that may accompany it. Parsley may also prove helpful against edema, jaundice, asthma, allergies, fevers, and coughs.
Parsley acts as an expectorant and has been shown to inhibit the secretion of histamine.
The juice has been successful in treating conjunctivitis and inflammation of the eyelids. It also may be effective against gallstones. Parsley extract should never be used if inflammation of the kidneys is present. Finally, parsley's use in the treatment of a certain form of cancer is an intriguing possibility, which although not proven, but may warrant further study. This may be one reason it is used as a garnish in many restaurants.