Two forms of parsley are used as herbs: curly leaf and Italian, or flat leaf (P. neapolitanum). Curly leaf parsley is often used as a garnish. One of the compounds of the essential oil is apiol. The use of curly leaf parsley may be favored by some because it cannot be confused with poison hemlock, like flat leaf parsley or chervi
Tea may be used as an enema. Chinese and German herbologists recommend parsley tea to help control high blood pressure, and the Cherokees used it as a tonic to strengthen the bladder. It is also often used as an emmenagogue.
Parsley also appears to increase diuresis by inhibiting the Na+/K+-ATPase pump in the kidney, thereby enhancing sodium and water excretion while increasing potassium reabsorption. It is also valued as an aquaretic.
When crushed and rubbed on the skin, parsley can reduce itching in mosquito bites.
It’s commonly believed that when chewed, parsley can freshen bad breath. However, some people regard this as a myth – it is no more effective than chewing any other substance .
Parsley should not be consumed as a drug or supplement by pregnant women. Parsley as an oil, root, leaf, or seed could lead to uterine stimulation and preterm labor.
Parsley is high in oxalic acid, a compound involved in the formation of kidney stones and nutrient deficiencies.
Parsley oil contains furanocoumarins and psoralens which leads to extreme photosensitivity if used orally.
Parsley seeds contain a high level of oil and are a diuretic.