Bok Choy: Nutrition, Benefits and How to Cook It

Bok choy, also called pak choi or Chinese white cabbage, is a mild, crunchy member of the cabbage family with white stalks and dark green leaves. It is mostly water, very low in calories, and in USDA data a cup of it brings a useful share of vitamin C, vitamin A and vitamin K, plus calcium your body absorbs well. This guide covers bok choy nutrition raw and cooked, what the realistic bok choy benefits are, how to cook it, and the two safety topics people search for: vitamin K with warfarin, and a much-quoted case report about raw bok choy and the thyroid.

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

What is bok choy?

Bok choy belongs to the species Brassica rapa, while round head cabbage and kale belong to Brassica oleracea. Both sit in the cruciferous or brassica family. You will see a few kinds in stores:

• Regular bok choy: large heads with thick white stalks and dark leaves.
• Baby bok choy: small, tender heads that cook in a few minutes and can be halved and seared whole.
• Shanghai bok choy: pale green, spoon-shaped stalks with a slightly sweeter taste.

The whole plant is edible. The stalks are juicy and crisp, a little like celery without the strings, and the leaves wilt quickly like spinach. Our guide to greens compares it with spinach, kale and other leaves, and our sibling guide to cabbage covers its round-headed relatives.

Bok choy nutrition: USDA values raw and cooked

These numbers come from the USDA FoodData Central SR Legacy database. Percent Daily Values use the FDA Daily Values found on Nutrition Facts labels. Raw is shown per shredded cup; cooked is a cup of boiled, drained bok choy without salt.

Why does the cooked cup look richer? A cup of raw shredded bok choy weighs about 70 grams in USDA data, while a cup of cooked bok choy weighs about 170 grams because the leaves collapse. Per 100 grams, raw bok choy keeps more vitamin C, since vitamin C is sensitive to heat and leaches into cooking water. Raw bok choy is about 95 percent water, which is why it is so low in calories.

The vitamin A in bok choy comes from carotenoids such as beta-carotene, the pigments covered in our beta-carotene guide. For context on how bok choy ranks among other foods for single nutrients, see our guides to vitamin C foods and calcium in foods.

Bok choy benefits: what the evidence supports

There are no large trials of bok choy itself, so the honest list of bok choy benefits is about what it contains and how it fits a varied diet:

• Nutrients for very few calories: it adds vitamin C, vitamin A, vitamin K and folate to a meal while adding almost no calories, which suits anyone building plates around vegetables, including people following a GLP-1 friendly eating pattern.
• Well-absorbed calcium: the NIH Office of Dietary Supplements names Chinese cabbage (bok choi) as a nondairy calcium source and notes that calcium from low-oxalate plants such as broccoli, kale and cabbage is absorbed about as well as calcium from milk. The catch is that the amount per serving is much lower than in a glass of milk. Spinach, by contrast, holds calcium in a form that is poorly absorbed because of oxalic acid.
• Glucosinolates: like other brassicas, bok choy contains sulfur compounds called glucosinolates. A 2024 systematic review explains that chopping or chewing raw brassicas releases an enzyme, myrosinase, that converts them to isothiocyanates and related compounds; cooking switches that enzyme off. Most research on these compounds is lab and animal work, so it does not show a benefit in people on its own.
• Gentle on many stomachs: Monash University’s sample FODMAP food list places bok choy among the low-FODMAP vegetable alternatives, which is why it shows up in plans built on a low-FODMAP diet.

Raw bok choy and the thyroid: what the case report says

Search for raw bok choy and you will find warnings about the thyroid. They trace back to one peer-reviewed case report, published as a letter in the New England Journal of Medicine in 2010. An 88-year-old woman with diabetes ate very large amounts of raw bok choy every day and developed myxedema coma, a rare and life-threatening form of severe hypothyroidism. X The authors linked her condition to compounds in raw brassicas that can interfere with how the thyroid uses iodine.

Two points put that case in proportion. First, the amount she ate was extreme, far beyond any normal serving. Second, a 2024 systematic review of 123 studies on brassica vegetables and the thyroid concluded that most results cast doubt on the idea that these vegetables harm thyroid function in people, and that eating them daily alongside adequate iodine showed no adverse effect. The NIH iodine fact sheet agrees that for most people in the United States who get enough iodine and eat a varied diet, reasonable amounts of these foods are not a concern. If you have a thyroid condition or low iodine intake, ask your clinician how brassicas fit your diet, and see our iodine guide for how iodine status is assessed.

Warfarin users: keep vitamin K steady

Bok choy contains vitamin K, and the boiled cup in the table supplies roughly half of the Daily Value. That matters mainly for people taking the blood thinner warfarin. The NIH Office of Dietary Supplements describes a serious interaction and advises that people on warfarin keep their vitamin K intake from food and supplements consistent, because sudden changes can make the drug more or less effective. MedlinePlus gives the same advice: eat consistent amounts of vitamin K foods week to week and talk to your doctor before changing your diet. Our guide to vitamin K foods ranks greens by vitamin K content.

How to cook bok choy

Rinse it well, since grit hides at the base of the stalks. Separate the leaves or halve baby heads lengthwise. Because stalks take longer than leaves, a simple trick is to start the sliced stalks first and add the leaves at the end. Common methods:

1. Stir-fry: a hot pan, a little oil, garlic or ginger, stalks first, then leaves until just wilted.
2. Steam: a few minutes keeps the stalks crisp and the color bright.
3. Sear baby bok choy: cut side down until browned, then a splash of broth and a lid to finish.
4. Soups: stir it into broth or noodle soup in the last minutes; a little miso works well, though it adds salt.
5. Raw: thinly sliced baby bok choy works in slaws and salads in normal amounts.

Watch the sauces. Soy sauce, oyster sauce and stock cubes can add more sodium than the vegetable itself; our low-sodium foods guide has label tips.

Who should be careful

• People taking warfarin: keep vitamin K intake steady and check with your clinician before big diet changes.
• People with thyroid conditions or low iodine: normal servings are fine for most, but ask your clinician, and avoid extreme raw-vegetable regimens.
• Gas and bloating: NIDDK lists cruciferous vegetables among foods that may cause extra gas; increase portions gradually.
• Kidney disease with potassium limits: cooked bok choy adds potassium, so follow the eating plan your care team gives you.

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 thyroid condition. 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: Cabbage Benefits and Nutrition: Red vs Green Cabbage, Leafy Greens: USDA List of Dark Greens, Spinach vs Kale and Tips, Foods High in Calcium: USDA List, Non-Dairy Sources and Absorption.