Broccoli is high in vitamin C, vitamin K, and fiber, while also delivering meaningful amounts of folate, potassium, and plant compounds linked to long-term health benefits. A single cup of chopped raw broccoli contains just 31 calories, making it one of the most nutrient-dense foods you can eat relative to its size.
Vitamin C and Vitamin K Lead the List
One cup of raw chopped broccoli provides about 81 milligrams of vitamin C, which covers roughly 90% of the daily value. That puts it in the same league as an orange, a comparison that surprises most people. Vitamin C supports immune function, helps your body absorb iron from plant foods, and plays a direct role in collagen production for skin and connective tissue. Heat breaks down vitamin C, so raw or lightly steamed broccoli retains far more than heavily cooked florets.
Vitamin K is the other standout. A half cup of cooked broccoli delivers 110 micrograms, which is 92% of the daily value on its own. Vitamin K is essential for normal blood clotting and plays a role in bone metabolism. If you take blood-thinning medication, large or inconsistent amounts of vitamin K can interfere with how those drugs work, so keeping your intake steady matters more than avoiding it entirely.
Fiber and Protein for a Vegetable
That same one-cup serving of raw broccoli provides about 2 grams of fiber and 3 grams of protein. Neither number sounds dramatic on its own, but broccoli is often eaten in generous portions and pairs easily with other high-fiber foods. The fiber is a mix of soluble and insoluble types, which supports both digestive regularity and the slower absorption of sugars after a meal. With only 6 grams of total carbohydrates per cup, broccoli fits comfortably into low-carb eating patterns.
Folate, Potassium, and Calcium
Beyond the headline vitamins, broccoli carries a useful spread of minerals and B vitamins. One cup of raw chopped broccoli contains approximately 57 micrograms of folate, 288 milligrams of potassium, and 43 milligrams of calcium.
Folate is a B vitamin critical for cell division and DNA synthesis, which is why it’s especially important during pregnancy. The 57 micrograms in a cup of broccoli covers about 14% of the daily value. Potassium helps regulate blood pressure by counterbalancing sodium, and 288 milligrams is a solid contribution from a single vegetable, roughly 6% of the daily target. The calcium content is modest compared to dairy, but it adds up if you eat broccoli regularly alongside other plant sources like kale and fortified foods.
Sulforaphane: The Compound That Sets Broccoli Apart
Broccoli belongs to the cruciferous vegetable family, which includes cauliflower, Brussels sprouts, and cabbage. What distinguishes broccoli, and especially broccoli sprouts, is its high concentration of a compound called glucoraphanin. On its own, glucoraphanin doesn’t do much. But when you chew raw broccoli, you rupture the plant’s cells and release an enzyme called myrosinase. That enzyme rapidly converts glucoraphanin into sulforaphane, which is the biologically active compound researchers are most interested in.
Sulforaphane has been studied for its ability to activate the body’s own antioxidant defenses and support detoxification pathways. The conversion depends on that enzyme being active, which is why preparation matters. Cooking broccoli at high heat for long periods deactivates myrosinase, reducing how much sulforaphane your body can produce. Steaming for a few minutes, eating broccoli raw, or adding a source of myrosinase (like mustard seed powder) to cooked broccoli can help preserve the conversion.
Carotenoids for Eye Health
Broccoli contains lutein and zeaxanthin, two pigments that accumulate in the retina and help filter high-energy blue light. One cup of cooked frozen broccoli provides roughly 2,015 micrograms of these combined carotenoids. That’s lower than what you’d get from spinach or kale, but broccoli contributes meaningfully if you eat it often. These carotenoids are fat-soluble, so pairing broccoli with a small amount of oil or butter helps your body absorb them more efficiently.
Raw vs. Cooked: What You Lose and Keep
How you prepare broccoli shifts its nutritional profile in ways worth knowing. Raw broccoli maximizes vitamin C and preserves the myrosinase enzyme needed to produce sulforaphane. Cooking, on the other hand, makes some nutrients more bioavailable. Lightly steaming broccoli for three to four minutes is generally the best compromise: it softens the fiber enough to improve digestibility while retaining most of the heat-sensitive vitamins. Boiling is the least ideal method because water-soluble nutrients like vitamin C and folate leach into the cooking water.
Frozen broccoli retains most minerals and carotenoids well but loses some vitamin C during the blanching process before freezing. It’s still a nutritious option, particularly when fresh broccoli isn’t available or convenient.