Swiss Chard: Nutrition, Benefits, Rainbow Chard and Cautions

Swiss chard is a leafy vegetable with broad, glossy leaves and thick stems that come in white, yellow, pink, red or orange. It belongs to the same species as the beet, Beta vulgaris, but it was bred for its leaves and stalks rather than its root. In USDA data, a cup of cooked Swiss chard supplies several times the Daily Value for vitamin K and a large share of the Daily Values for vitamin A and magnesium, for about 35 calories. Below is the full Swiss chard nutrition picture per serving, how it compares with spinach and kale, what research does and does not show about Swiss chard benefits, and two cautions worth knowing: oxalate and warfarin.

Peptide Labs does not sell Swiss chard or chard products. This article is general nutrition information, not medical advice.

What is Swiss chard?

Chard is a leaf beet: botanists list it as Beta vulgaris subspecies cicla, the same species as table beets. Where beets were selected for a swollen root, chard was selected for large leaves and fleshy stalks, and a 2026 study notes that it has been used in many cuisines worldwide for a long time. Our beetroot guide covers the root side of the family.

• White or green-stemmed chard: the classic type, with pale, celery-like stalks and a mild taste.
• Red or ruby chard: deep red stems and veins that can bleed color into a dish, much like beets.
• Rainbow chard: not a single variety but a bunch of mixed stem colors sold together. A 2004 lab analysis of a multicolored variety identified 19 yellow-orange betaxanthins and 9 red-purple betacyanins in the stems, the betalain pigments that also color beets.

A 2026 lab study of four chard cultivars with different stem colors identified 63 compounds, flagging flavonoids, carotenoids and several less familiar molecules as antioxidant candidates in test-tube assays. Lab antioxidant scores describe the plant; they do not show an effect in people.

Swiss chard nutrition per serving (USDA)

Values below come from the USDA FoodData Central SR Legacy database, with percent Daily Value (% DV) based on FDA Daily Values. Raw chard is light and airy, so a cup of raw leaves weighs only 36 grams; cooking collapses it, and a cup of boiled chard weighs 175 grams. That is why the cooked column looks so much richer: it is roughly five times as much chard.

Three things stand out. First, vitamin K: chard is among the richest common sources, as our guide to vitamin K in foods shows. Second, magnesium: a cooked cup covers more than a third of the Daily Value, which puts chard near the top of our list of magnesium sources. Third, sodium: chard is naturally saltier than most vegetables, with 213 milligrams per 100 grams raw in USDA data, so people tracking sodium should count it even before adding salt; our low sodium foods guide has context. The iron in chard is the non-heme kind, which the body absorbs less readily than iron from meat; our iron foods guide explains how vitamin C at the same meal helps.

Swiss chard vs spinach and kale

Chard is often swapped for spinach in recipes. Per 100 grams raw, here is how the three compare with beet greens, chard’s closest relative in the produce aisle.

So in the Swiss chard vs spinach question, the two are close on calories and magnesium; chard has more vitamin K and sodium, while spinach has more vitamin A, potassium and folate. Kale stands apart for vitamin C, as our kale guide covers. In a 2014 nutrient density ranking published by a CDC journal, chard placed third of 41 fruits and vegetables, just behind watercress and Chinese cabbage. That score measures nutrients per calorie, not health outcomes. For the wider family, see our guide to greens.

Swiss chard benefits: what the evidence shows

Most of what can be said about Swiss chard benefits comes from its nutrient profile, not from trials. A Europe PMC search for human trials of chard itself turned up agricultural, food-processing and nitrate studies, but no randomized trials in people. The fair summary is:

• Nutrient density: chard delivers vitamins K and A, magnesium, potassium, iron and fiber for very few calories, which is useful when meals are small, for example on a GLP-1 medicine (see our GLP-1 diet guide).
• Vegetable variety: the Dietary Guidelines for Americans encourage a variety of vegetables, including dark green ones, and chard counts toward that. No study shows chard does something special on its own.
• Pigments: betalains and flavonoids in chard are studied in the lab. Claims that chard controls blood sugar or fights disease go beyond the evidence.

Oxalate, vitamin K and other cautions

• Oxalate and kidney stones: the National Kidney Foundation lists Swiss chard with spinach among very high oxalate foods, and a 2019 review placed chard in its “avoid” group for people forming calcium oxalate stones. The NKF also says a strict low oxalate diet is not helpful for most people and that eating enough calcium lowers oxalate absorption. If you have had stones, ask your clinician or a dietitian; our oxalate guide explains more.
• Warfarin: the NIH Office of Dietary Supplements says people who take warfarin need a consistent vitamin K intake, because sudden changes can alter how the drug works. That means steady habits, not avoidance; talk with your care team before making big changes.
• Potassium and kidney disease: cooked chard adds potassium, and people with chronic kidney disease can develop high blood potassium; our potassium guide explains why their care team sets limits.
• Sodium: chard’s natural sodium is modest per serving but worth counting on a sodium-restricted plan.

How to cook Swiss chard

• Separate stems and leaves: the stems take longer to soften, so slice them and start them a few minutes before the leaves.
• Saute or braise: garlic and olive oil are classic; the NIH Office of Dietary Supplements notes that eating vegetables with some fat improves vitamin K absorption.
• Eat it raw: young leaves work in salads, while mature leaves are better cooked.
• Wash well: rinse leaves under running water to remove grit, then dry before sauteing.
• Store: keep unwashed chard wrapped in the refrigerator and use it within a few days, before the leaves wilt.

Looking for a root vegetable to serve alongside? Our sibling guide to celery root covers celeriac, another vegetable that is better known in Europe than in the US.

Frequently Asked Questions

Questions about a label? Contact us or read our Buyer’s Guide. Food comes first; follow the label and ask a healthcare provider before starting a supplement, especially if you take medicines, are pregnant or have a food allergy. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Last reviewed October 2026.

Related guides: Celery Root (Celeriac): Nutrition, Uses and Allergy Facts, Leafy Greens: USDA List of Dark Greens, Spinach vs Kale and Tips, Oxalates: High Oxalate Foods, Low Oxalate Foods and Kidney Stones.