Parsley

botanicalherb

What is it

Parsley ( Petroselinum crispum ) is a biennial flowering herb in the Apiaceae family, native to the central Mediterranean and cultivated worldwide for its leaves, seeds, and roots. The plant is a dense food source of vitamin K1 (phylloquinone), vitamin C, folate, and beta-carotene, and contains characteristic flavonoids - chiefly apigenin and its 7-apioglucoside apiin - as well as essential-oil constituents (apiole, myristicin, and limonene) responsible for its diuretic, carminative, and historical emmenagogue effects. Apigenin acts on multiple molecular targets including monoamine oxidase, GABA-A benzodiazepine sites, and several inflammatory signaling pathways.

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Source of vitamin K1 and antioxidant micronutrients

Strong

Fresh parsley is among the most concentrated dietary sources of phylloquinone (vitamin K1), with roughly 1640 mcg per 100 g, and supplies meaningful amounts of vitamin C, folate, and carotenoids. Its nutritional contribution to vitamin K status is well established and clinically relevant for individuals on vitamin K antagonists who must keep intake consistent.

Halitosis (breath freshening)

Limited

Chewing fresh parsley after meals is a traditional remedy for bad breath, attributed to chlorophyll and volatile-oil neutralization of sulfur compounds. Small clinical studies and in vitro work support modest reductions in oral volatile sulfur compounds, but the effect is short-lived.

Mild diuresis and lower urinary tract symptoms

Mixed

Parsley leaf and seed have a long traditional use as aquaretic diuretics, and small animal and human pilot studies show modest increases in urine output, plausibly via inhibition of the Na+/K+ pump in the tubular epithelium. Robust clinical trials are absent and parsley should not substitute for guideline-based diuretic therapy in heart failure or hypertension.

In vitro antioxidant and anti-inflammatory activity

Mixed

Apigenin and parsley extracts demonstrate antioxidant, anti-inflammatory, and modest antimicrobial effects in cell and animal studies. Clinical trials translating these effects to specific disease indications are essentially absent.

Dosage

Culinary intake of fresh parsley (1-2 tablespoons, ~4-8 g) is unrestricted for healthy individuals. Tea preparations typically use 1-2 g of dried herb per cup, two to three times daily. Standardized supplements deliver 250-1000 mg of leaf powder or extract per day. Parsley seed essential oil and high-dose apiole are not recommended for self-use because of toxicity concerns. Patients on vitamin K antagonists (warfarin) should keep their dietary parsley intake consistent rather than restricting it.

Safety

Culinary parsley is safe. Parsley seed essential oil, parsley juice taken in large volumes, and isolated apiole have caused hepatotoxicity, nephrotoxicity, hemolysis, and severe uterine bleeding historically when used as abortifacients; these forms should be avoided. Because the herb is rich in vitamin K1, large or fluctuating intakes can reduce the anticoagulant effect of warfarin and other vitamin K antagonists . The essential-oil constituents apiole and myristicin are uterine stimulants ; medicinal-dose use is contraindicated in pregnancy. Caution in active kidney disease due to nephrotoxic potential of concentrated extracts, and consider potential photosensitization from furanocoumarin content in some cultivars.

References

  • Wikidata: parsley (Q25284) — Wikidata link
  • USDA FoodData Central: Parsley, fresh — USDA link
  • NIH Office of Dietary Supplements: Vitamin K — NIH ODS link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.