Paul Johnston is the founder and master herbalist of The Herb Prof, with decades of clinical experience in naturopathic medicine, herbal remedies, detoxification and holistic wellness. After overcoming his own serious health challenges, he now dedicates himself to helping others reclaim their health naturally.
Parsley is one of the most underestimated herbs in both the kitchen and the clinic. Most people reach for it as a garnish and leave it at that, but decades of traditional use and a growing body of modern research tell a different story. This guide covers everything worth knowing about parsley: its nutritional profile, health benefits, clinical uses, how to grow it, and how to get the most from it in the kitchen.
What Is Parsley?
Parsley (Petroselinum crispum) comes in two main varieties: curly parsley, commonly used as a garnish, and Italian flat-leaf parsley, which chefs and herbalists prefer for its bolder flavour and higher concentration of active compounds. Both varieties share the same core nutritional and medicinal properties, though flat-leaf parsley delivers a more pronounced taste in cooking and a slightly richer nutrient profile.
Nutritional Profile of Parsley
Parsley packs a significant nutritional punch for such a small herb. Just two tablespoons (8 grams) provide 16% of the recommended daily intake of vitamin C, 154% of vitamin K, and 12% of vitamin A. Beyond those headline figures, parsley also delivers folate, calcium, iron, magnesium, and potassium in meaningful amounts.
Per 100g, parsley contains 3.07g of protein and 3.3g of dietary fibre, making it a useful addition to plant-based diets. It is low in calories and carbohydrates, so it adds genuine nutritional value without affecting overall energy intake.
Key Vitamins and Minerals
- Vitamin K – essential for blood clotting and bone density
- Vitamin C – supports immune function and collagen production
- Vitamin A – supports vision, skin health, and immune response
- Folate – critical for cell growth and development
- Iron – necessary for healthy red blood cell production
- Calcium and Magnesium – support bone strength and muscle function
- Boron and Fluorine – contribute to bone mineralisation
Parsley Benefits for Health
Antioxidant Properties
Parsley contains high concentrations of lutein, zeaxanthin, carotenoids, myricetin, luteolin, apigenin, and apiol, compounds with well-documented antioxidant effects. These protect cells against oxidative stress and may reduce the long-term risk of heart disease, cancer, and diabetes.
Heart Health and Circulation
Parsley supports cardiovascular health through several mechanisms. Its compounds help lower blood pressure, reduce cholesterol levels, and inhibit the formation of blood clots. Together these effects reduce the risk of heart disease and stroke.
Potential Parsley Benefits on Cancer Prevention
The flavonoids in parsley, particularly apigenin, have shown cancer-preventive properties in research. These compounds inhibit the growth and spread of cancer cells and may reduce the risk of breast, prostate, and colon cancers.
Diabetes Management
Parsley contains compounds that help regulate blood sugar and improve insulin sensitivity. For people managing diabetes, this can reduce the risk of nerve damage, kidney disease, and vision complications.
Parsley Benefits for Eye Health
The lutein and zeaxanthin content in parsley directly supports eye health. These carotenoids protect against age-related macular degeneration and help maintain long-term vision quality.
Bone Health
High vitamin K levels make parsley particularly valuable for bone density. Regular consumption improves bone mineralisation and reduces the risk of fractures and osteoporosis.
Parsley Benefits for Digestive Health
Parsley has served as a natural digestive remedy for centuries. Its compounds soothe inflammation in the digestive tract, reduce bloating and gas, and support healthy digestion. The carminative action of parsley root specifically relieves flatulence and colic.
Kidney Health
The German Commission E, the authoritative advisory panel on herbal medicines, has approved parsley for use in the prevention and treatment of kidney stones. Parsley acts as a natural diuretic, increasing urine production and helping flush toxins from the body. It also reduces inflammation in the kidneys.
Immune Support and Anti-Inflammatory Effects
Parsley contains luteolin, apigenin, myristicin, and apiol, compounds with both anti-inflammatory and antibacterial properties. These support immune function, reduce systemic inflammation, and may help prevent infections.
Parsley Benefits as Natural Breath Freshener
Parsley’s high chlorophyll content makes it an effective natural breath freshener. Chlorophyll has antibacterial properties that neutralise odour-causing bacteria in the mouth. Chewing fresh parsley leaves or drinking parsley tea after meals delivers this benefit directly.
German Commission E – Clinical Endorsement
The German Commission E has approved parsley for use in preventing and treating kidney stones. The saponin content in parsley may also help relieve coughs. Parsley root acts as a laxative, and its carminative action relieves flatulence and colic. The Commission also notes parsley’s rich content of vitamins A and C, calcium, thiamin, riboflavin, niacin, zinc, potassium, iron and highlights its high chlorophyll content as a natural breath freshener.
Italian Flat-Leaf vs Curly Parsley
Italian flat-leaf parsley stands apart from curly parsley in both flavour and practical use. Its flat, serrated leaves carry a bolder, earthier taste that holds up well in cooked dishes, sauces, marinades, roasted vegetables, and soups. Curly parsley has a milder flavour and works better as a garnish or in fresh preparations. For medicinal and culinary purposes, flat-leaf parsley is the stronger choice.
It pairs naturally with garlic, lemon, and olive oil, and forms the backbone of dishes like tabbouleh and gremolata. Both varieties share the same core health benefits, though flat-leaf parsley generally delivers more flavour per gram.
Growing Parsley – Companion Planting
Companion planting with parsley benefits the wider garden. Parsley attracts hoverflies, which feed on aphids, thrips, and other common pests. It also draws parasitic wasps, which prey on caterpillars and codling moths, providing natural pest control without chemical pesticides.
Best Companion Plants for Parsley
- Tomatoes – help deter aphids and hornworms; both need 6-8 hours of sunlight daily
- Peppers – enhance soil health; tolerate similar light conditions to parsley
- Asparagus – parsley helps repel asparagus beetles; both prefer well-drained soil
- Beans and Peas – beans fix nitrogen in the soil, feeding parsley and nearby plants
- Marigolds – deter pests, attract pollinators, and add resilience to the garden
Plants to Avoid Near Parsley
- Fennel – releases allelopathic chemicals that inhibit parsley’s growth
- Alliums (onions, garlic, leeks) – compete for space and nutrients; can affect parsley’s flavour
- Lettuce – attracts pests that harm parsley and competes for similar soil conditions
Ideal Growing Conditions
Parsley grows best in well-drained soil with a pH between 6.0 and 7.0 and at least six hours of direct sunlight daily. Plant seeds approximately 1/4 inch deep and 8 to 10 inches apart. Water regularly to keep the soil moist but not waterlogged.
Apply a balanced fertiliser every four to six weeks to support steady growth. Harvest outer leaves regularly, frequent harvesting encourages the plant to produce more growth. Watch for aphids and caterpillars; a gentle rinse with water handles most infestations without resorting to pesticides.
Culinary Uses: Parsley Benefits in the Kitchen
Fresh parsley adds flavour and nutrition to a wide range of dishes. Use it chopped over salads, stirred into pasta sauces, blended into pesto, or scattered over roasted vegetables just before serving. It forms a key ingredient in tabbouleh, gremolata, chimichurri, and herb-based marinades. Adding parsley to smoothies and juices provides a nutritional boost, its high vitamin C content makes it a useful addition to morning routines.
Fresh vs. Dried Parsley
Fresh parsley delivers the best flavour and the highest nutrient content. Dried parsley loses both potency and vibrancy over time, use it in cooked dishes where the difference is less noticeable. Store dried parsley in an airtight container away from direct sunlight for up to six months.
To store fresh parsley, trim the stems and place the bunch in a jar of water in the refrigerator, similar to storing fresh flowers. This keeps it fresh for up to a week. Alternatively, wrap it in a damp paper towel and seal in a bag in the refrigerator.
Parsley Benefits in Ancient History
In ancient times, parsley was dedicated to Persephone, goddess of the underworld in Greek mythology. The herb’s slow germination gave rise to the folk legend that parsley must visit Hades seven times before it freely grows on earth.
Ancient Greeks and Romans used parsley ceremonially, it was sprinkled on corpses to mask the scent of decay and planted on graves. Roman gladiators ate parsley before entering the arena. It was also believed that parsley would only flourish in gardens presided over by a strong woman of the household.
Side Effects and Considerations
Parsley is generally safe for most people when consumed in normal culinary amounts. Larger therapeutic doses warrant attention to the following:
- Blood thinners – parsley’s vitamin K content and diuretic compounds may interact with anticoagulant medications; consult a healthcare provider before using medicinally
- Blood pressure medication – parsley’s diuretic effect may compound the action of antihypertensive drugs
- Kidney stones – parsley contains oxalates; people with a history of kidney stones should exercise caution with large doses
- Allergic reactions – some people are sensitive to parsley; symptoms include itching, swelling, and difficulty breathing; seek medical attention if these occur
- Pregnancy – large amounts of parsley may stimulate uterine contractions; pregnant women should stick to normal culinary use Always consult a qualified healthcare professional before using parsley therapeutically, particularly if taking prescription medication.
Before You Go – Parsley Benefits
Parsley earns its place in both the herb garden and the clinic. Few herbs combine such a strong nutritional profile with genuine medicinal endorsement, the German Commission E approval for kidney stone prevention is not something every herb on the shelf can claim. Grow it, use it fresh, and treat it as more than a garnish.
References – Parsley Benefits
Little Herb Encyclopedia, by Jack Ritchason; N.D., Woodland Publishing Incorporated, 1995
The Ultimate Healing System, Course Manual, Copyright 1985, Don Lepore
Planetary Herbology, Michael Tierra, C.A., N.D., Lotus Press, 1988
Handbook of Medicinal Herbs, by James A. Duke, Pub. CRP Second Edition 2007
The Complete Medicinal Herbal, by Penelope Ody, Published by Dorling Kindersley
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Frequently Asked Questions – Parsley Benefits
What are the main health benefits of parsley?
Parsley supports heart health, bone density, eye health, kidney function, immune response, and digestion. Its antioxidant compounds, including lutein, zeaxanthin, apigenin, and luteolin, protect against oxidative stress and chronic disease.
What is the difference between flat-leaf and curly parsley?
Italian flat-leaf parsley has a bolder, earthier flavour and is preferred in cooking and herbal medicine. Curly parsley has a milder taste and works better as a garnish. Both share the same core nutritional and medicinal properties.
How much parsley should I eat daily?
Around two to three tablespoons of fresh parsley daily is a reasonable culinary amount for most people. For therapeutic use, particularly for kidney health, consult a qualified practitioner for appropriate dosing.
Can parsley interact with medications?
Yes. Parsley can interact with blood thinners, blood pressure medications, and diuretics. Always consult a healthcare provider before using parsley in therapeutic amounts alongside prescription medication.
What plants grow well with parsley in the garden?
Tomatoes, peppers, asparagus, beans, peas, and marigolds all grow well alongside parsley. Avoid planting parsley near fennel, alliums, or lettuce, as these can inhibit its growth or compete for nutrients.
Is fresh parsley better than dried?
Yes, fresh parsley delivers significantly more flavour and nutritional value than dried. Use fresh wherever possible and add it at the end of cooking to preserve its active compounds.
What did the German Commission E say about parsley?
The German Commission E approved parsley for the prevention and treatment of kidney stones. The Commission also recognised its carminative action for relieving flatulence and colic, its saponin content for easing coughs, and its high vitamin and mineral content for general health support.