Parsnips: Nutrients, What Research Shows and Safety

The parsnip (Pastinaca sativa) is a root vegetable in the carrot and celery family (Apiaceae). The pale, sweet root is the part eaten. People eat parsnips for fiber, folate, potassium and vitamin C. This page keeps the whole food apart from supplements and extracts, and it does not use hype. It is information, not a plan for what to eat. Research on parsnips themselves is thin, and we say so below.

Read this first

• Allergy: any food can cause an allergic reaction. For trouble breathing or swelling of the face or throat, call 911. See food allergy basics and emergency signs.
• Wild parsnip is not the same as the vegetable on your plate. Sap from the stems and leaves of the wild plant can cause blistering skin reactions when skin is then exposed to sunlight. The sources we read describe skin contact, not eating the cultivated root. [8][9]
• Potassium: one cup of sliced parsnip has about 499 mg of potassium (our arithmetic from USDA). MedlinePlus says people with chronic kidney disease may need a diet that limits potassium, so ask your kidney team. [1][5]
• Evidence in one line: NHS counts parsnips as a vegetable portion, and vegetables in general are linked to better health in observational studies. We found no human trial testing parsnips themselves for a disease. [2][10]

What is in it (USDA values)

Source: USDA FoodData Central, parsnips, raw (SR Legacy, item 170417). [1] % Daily Value uses the FDA 2016 Daily Values; values vary with variety, ripeness and storage. Per-serving figures are our arithmetic from the USDA per-100 g values.

Parsnips are not orange: USDA lists no carotenes or vitamin A for the raw root. A 2026 review describes the root as rich in starch, fiber, vitamin C and minerals, and lists furanocoumarins among its plant compounds. [6] Another review of 46 articles lists furanocoumarins, flavonoids, polyacetylenes and essential oils, and says there are few clinical studies of parsnip. [7] The effects reported in those reviews (antioxidant, anti-diabetic and others) come mainly from lab and animal work, not from people. [6][7]

What research says

Eaten as food vs taken as a supplement or extract. The human findings above are about fiber, folate and vegetables eaten as food. The results that point to special health effects of parsnip come from extracts, isolated compounds, cells and animals. A result in a mouse for an extract does not tell us what a plate of roasted parsnips does. We do not cover parsnip supplements.

How much is a normal serving

• NHS: 80 g of fresh, canned or frozen vegetables is one portion of the 5 A DAY, and the page says sweet potatoes, parsnips, swedes and turnips do count (ordinary potatoes do not). Page last reviewed 9 June 2026. [2] Eighty grams is a little over half a cup of sliced parsnip (the USDA household portion is 1 cup, slices, 133 g). [1]
• WHO: at least 400 g of fruits and vegetables a day for people older than 10 (fact sheet date 26 January 2026). [12]
• NHS gives a target of 30 g of fiber a day for adults (page last reviewed 2 March 2026). [3]
• These are official figures, information only, not a prescription.
• Cooking: we did not find a source on how roasting or boiling changes parsnip nutrients. Proper evidence not found.

Safety, allergy and medicines

• Allergy: we did not find a source describing a parsnip allergy rate. Any food can cause an allergic reaction. For trouble breathing or swelling of the face or throat, call 911.
• Wild parsnip sap and the skin: a 2018 case report describes a woman who developed blistering, later dark patches, after contact with wild parsnip on a prairie; the stems and leaves contain furocoumarins that react when activated by ultraviolet light (sunlight). [9] A 2024 review names Pastinaca sativa among phototoxic plants, explains that furanocoumarins plus UV light cause redness, blisters and dark skin patches (phytophotodermatitis), and recommends protective clothing such as long sleeves and gloves. [8] A 2021 review calls phototoxicity the main side effect of parsnip, usually from direct skin contact. [7] If sap gets on your skin, seek advice from a clinician or pharmacist. We could not read a source on giant hogweed, so we make no claim about it.
• Eating the root: we did not find a source measuring furanocoumarins in the cultivated root or linking eating parsnips to a skin reaction. Proper evidence not found.
• Kidney disease and potassium: parsnip has 375 mg potassium per 100 g (8% Daily Value). [1] MedlinePlus says healthy kidneys keep potassium at the right level, that with chronic kidney disease the kidneys may not remove extra potassium, and that some medicines can raise potassium; it does not name the medicines. [5] See foods, kidney disease, potassium and oxalates.
• Medicines and vitamin K: a cup has about 25% of the vitamin K Daily Value (USDA). [1] We did not read a source on parsnips and warfarin, so we make no claim. People on warfarin should ask their prescriber. See foods and medicine interactions.
• Sugar and diabetes: USDA lists 4.8 g of sugars and about 18 g of carbohydrate per 100 g. [1] We did not read a source linking eaten parsnips to blood sugar, so we make no claim.
• Pregnancy, bloating and pesticide residues: Proper evidence not found in the sources we read.

Choosing, storing and food safety

• Choose produce that is not bruised or damaged; cut away damaged areas. [11]
• Rinse all produce under running water and scrub firm items with a clean brush, even if you will peel it. Do not use soap or produce wash. [11]
• Keep perishable produce refrigerated at 40°F or below and keep raw produce away from raw meat. [11]
• Only eat parsnips you bought or grew yourself. Do not pick wild plants for food unless an expert has identified them. See fresh, frozen and canned produce.

Related pages

• Sweet potatoes, carrots and orange vegetables
• How much fiber per day and fiber side effects
• Foods, kidney disease, potassium and oxalates
• Foods and medicine interactions: vitamin K, grapefruit and others
• Fresh, frozen and canned produce
• Observational vs trial evidence in nutrition