Cauliflower's Vitamin C, Vitamin K and Choline

Table of Contents

1. Three Nutrients Worth Knowing About
2. What Is Actually in a Cup
3. Vitamin C: Half a Day in a Cup
4. What Cooking and Storage Cost You
5. Vitamin K: Modest, Real and Worth Knowing
6. Vitamin K and Blood Thinners
7. Choline: the Nutrient Most People Miss
8. What Choline Actually Does
9. Folate, Potassium and the Rest of the Panel
10. Colour Changes the Nutrients
11. Putting It on the Plate
12. Key Research Papers
13. Connections
14. Featured Videos

Three Nutrients Worth Knowing About

Most vegetables have one headline nutrient. Spinach has iron and folate, carrots have beta-carotene, kale has vitamin K by the bucket. Cauliflower's profile is flatter than that — it is good at several things rather than spectacular at one — which is precisely why it gets underestimated. Three entries on its panel deserve individual attention, for three different reasons.

1. Vitamin C, because the amount is genuinely high and almost nobody expects it from a white vegetable, and because it is the nutrient most easily destroyed by how you cook.
2. Vitamin K1, because the amount is moderate rather than large, which makes cauliflower a useful vegetable for anyone taking warfarin — a group routinely and wrongly told to avoid vegetables altogether.
3. Choline, because population intakes are low, because plant sources of it are thin on the ground, and because cauliflower is quietly one of the best of them.

The rest of the panel — folate, potassium, vitamin B6, fibre, a little of most minerals — is respectable rather than remarkable, and gets its own shorter section below.

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What Is Actually in a Cup

Standard reference figures for raw cauliflower, per 100 grams (about a cup of chopped florets, give or take):

1. Energy: about 25 calories. This is the number that made cauliflower the substitution vegetable of the 2010s.
2. Carbohydrate: about 5 grams, of which roughly 2 grams is fibre. The digestible carbohydrate is therefore around 3 grams.
3. Protein: about 2 grams. Small, but not zero, and it is complete enough to count toward the day.
4. Vitamin C: roughly 48 milligrams — more than half the adult daily requirement.
5. Vitamin K1 (phylloquinone): roughly 15 micrograms.
6. Folate: roughly 57 micrograms.
7. Choline: roughly 44 milligrams.
8. Potassium: roughly 300 milligrams.
9. Vitamin B6: a modest but useful contribution, along with pantothenic acid.

Two caveats to hold alongside those numbers. First, they are averages of analysed samples; a real head varies with cultivar, soil, season and how long it has been sitting. Second, and more importantly, the vitamin C figure is for raw cauliflower — the section below explains how much of it survives to your plate, which depends almost entirely on what you do next.

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Vitamin C: Half a Day in a Cup

The recommended intake for adults is 90 milligrams a day for men and 75 for women, with an extra 35 milligrams recommended for smokers because tobacco smoke accelerates its turnover. A 100-gram serving of raw cauliflower supplies around 48 milligrams. That is more than half a day's requirement from a vegetable most people do not associate with vitamin C at all — comparable, weight for weight, to a good deal of the citrus fruit that gets all the credit.

The colour is the reason nobody expects it. We have learned to read vitamin content off pigment: orange means carotene, dark green means folate and vitamin K, deep red and purple mean anthocyanins. Vitamin C is colourless, so a white vegetable gives no visual cue that it is loaded with the stuff. Potatoes catch the same unfair reputation for the same reason.

What vitamin C is doing. Carr and Maggini's review of vitamin C and immune function sets out the range: it accumulates in white blood cells at concentrations far above plasma, supports the barrier function of skin and epithelium, is consumed during infection (which is why plasma levels fall when you are ill), and is a required cofactor for the enzymes that build collagen. Collagen is why scurvy looks the way it does — bleeding gums, poor wound healing, joint pain — and it is the clearest illustration that vitamin C is structural, not just an antioxidant.

Two practical roles are worth adding. Vitamin C sharply increases the absorption of non-haem iron — the form found in plants — by reducing it to a more absorbable state in the gut. A cauliflower-containing meal therefore helps you extract iron from the beans, lentils or greens on the same plate. And vitamin C regenerates other antioxidants, including vitamin E, which is part of why the network of dietary antioxidants works better together than any of them does alone.

What vitamin C from cauliflower will not do is prevent a cold. The trial evidence on that question is extensive and consistently unimpressive at ordinary intakes. Getting enough vitamin C matters; getting a lot more than enough has not been shown to buy anything extra for most people.

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What Cooking and Storage Cost You

Vitamin C is the most fragile nutrient in common food. It is water-soluble, so it leaches; it is heat-labile, so it degrades; and it oxidises on exposure to air, so it declines even in the fridge. All three routes are working on a cauliflower at once.

Boiling is the expensive method. The loss has two components: destruction by heat, and — usually larger — dissolution into the cooking water, which then goes down the sink. Pellegrini and colleagues compared boiling, steaming and microwaving across brassica vegetables including cauliflower and documented the pattern that every study of this kind finds: water-immersion cooking is the harshest treatment for water-soluble nutrients, and the losses scale with both time and the volume of water used.

Steaming and microwaving are markedly better, for the simple reason that the vegetable never sits in water. Roasting is also good on this measure — nothing leaches from a dry pan — though the higher temperatures do drive some thermal degradation.

Storage matters more than people expect. Volden and colleagues measured ascorbic acid alongside glucosinolates, phenols and anthocyanins in cauliflower through long-term freezer storage, and the ascorbate declines steadily even at freezer temperatures. In the fridge the decline is faster. A head that has spent a week in your vegetable drawer after several days in a distribution chain is not delivering the reference figure.

The practical rules that follow are short:

1. Steam, microwave or roast in preference to boiling. If you boil, do it briefly, in a small amount of water.
2. If you boil, use the water. Turn it into the base of a soup or a sauce and you recover most of what leached out. Cauliflower cooking water makes a decent soup base in its own right.
3. Eat some of it raw. Raw florets in a salad, or thinly sliced raw as a slaw, deliver the full figure. This also preserves the plant's own enzymes — see our glucosinolates page.
4. Cook it soon after buying, and cut it just before cooking. Cut surfaces oxidise.
5. Do not soak cut florets in water. A long soak leaches vitamin C before cooking has even started.

One thing not to do is give up on cooked cauliflower. A cooked vegetable you eat several times a week beats a raw one you eat twice a year, and even a heavily boiled cauliflower still contributes real vitamin C, fibre, folate and potassium.

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Vitamin K: Modest, Real and Worth Knowing

Vitamin K1, phylloquinone, is the plant form of the vitamin, made in chloroplasts — which is why leaf vegetables are loaded with it and pale vegetables are not. Booth and colleagues measured phylloquinone across the food supply in the US Food and Drug Administration's Total Diet Study, and the resulting tables are still the reference for what actually contains it: dark leafy greens at the top by a wide margin, then the other brassicas, then everything else a long way down.

Cauliflower sits in a middle band at roughly 15 micrograms per 100 grams. Adult adequate intakes are 120 micrograms a day for men and 90 for women, so a serving contributes a useful slice rather than the whole thing. Broccoli, its green cousin, carries several times as much; kale and spinach carry many times more again.

What it does. Vitamin K is a required cofactor for an enzyme that modifies specific proteins by adding a carboxyl group to glutamate residues, which is what allows those proteins to bind calcium. The best-known family is the clotting factors, and this is why severe vitamin K deficiency causes bleeding. But the same modification is required by osteocalcin in bone, where it participates in mineralisation, and by matrix Gla protein in blood vessel walls, where it acts as an inhibitor of calcification. That second role is why vitamin K has attracted interest well beyond haematology, and it is covered on our Vitamin K page.

Vitamin K is fat-soluble, so absorption improves with fat in the meal. Roasting cauliflower in olive oil, or dressing steamed florets with oil or butter, genuinely helps — this is one of the cases where a fat-free preparation costs you something measurable.

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Vitamin K and Blood Thinners

Warfarin works by blocking the recycling of vitamin K, so vitamin K intake and warfarin dose are directly linked. The advice many people receive from this is wrong, and it causes real harm: they are told to avoid green vegetables. Booth and Centurelli's guidance on the dietary management of patients on warfarin makes the correct point instead, and it has not changed since.

The goal is consistency, not avoidance. A stable, moderate vitamin K intake lets the dose be titrated to it and then stay put. It is the swings that destabilise the INR — a week of salads after a month of none, or the reverse. Someone who eats a similar amount of vegetables every week is easier to anticoagulate safely than someone who eats none and then has a health kick.

Cauliflower is a good vegetable for this situation precisely because its vitamin K content is moderate. A serving will not swing an INR the way a large plate of kale might, so it lets someone on warfarin eat a cruciferous vegetable, with all the fibre, vitamin C, folate and glucosinolates attached, without much arithmetic.

Two practical notes. Tell whoever manages your anticoagulation about any deliberate, sustained change in vegetable intake — not so they can stop you, but so the dose can be adjusted alongside it. And note that the direct oral anticoagulants that have largely replaced warfarin do not work through vitamin K at all, so this consideration does not apply to them.

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Choline: the Nutrient Most People Miss

This is the part of cauliflower's profile that deserves more attention than it gets.

Choline was formally recognised as an essential nutrient by the US Institute of Medicine in 1998, which set adequate intakes of 550 milligrams a day for men and 425 for women, rising to 450 in pregnancy and 550 during breastfeeding. It is a late arrival to the nutrient tables, and that lateness shows: it is absent from many food composition databases, absent from most nutrition labels, and absent from most people's mental model of what a diet needs.

Wallace and Fulgoni assessed total choline intakes across the US population and found that the great majority fall below the adequate intake — a shortfall that holds across age groups and both sexes. Zeisel and da Costa had already argued the case for treating choline as a public-health nutrient rather than a specialist concern, and the intake data supports them.

Where cauliflower comes in. The richest sources of choline are animal foods: egg yolk and liver are in a class of their own, and meat and fish contribute steadily. Among vegetables the pickings are much thinner — and cauliflower is one of the best of them, at roughly 44 milligrams per 100 grams. For comparison, broccoli and Brussels sprouts, its close relatives, sit at around 19 milligrams. Cauliflower carries more than twice the choline of the vegetable it is usually treated as an inferior substitute for.

That will not carry the day on its own — 44 milligrams against an adequate intake of 425 to 550 is a tenth of the target. But nutrients are accumulated from many small contributions, and for anyone eating few or no eggs, few or no animal foods, the list of realistic plant contributors is short enough that cauliflower's place on it matters. Add it to a plate that also has beans, whole grains and a little more cruciferous vegetable and the day's total starts to look different.

Choline is heat-stable, which is a welcome contrast to vitamin C, so cooking does not destroy it. It is water-soluble, though, so long boiling in plenty of water will leach some of it out — the same argument for steaming, roasting and keeping the cooking water applies here too.

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What Choline Actually Does

Choline is unusual in doing four largely unrelated jobs, which is why a shortfall does not produce one recognisable deficiency syndrome.

1. Cell membranes. Choline is the head group of phosphatidylcholine, the most abundant phospholipid in animal cell membranes, and of sphingomyelin, which insulates nerve fibres. Every cell you build needs it.
2. Acetylcholine. Choline is the direct precursor of the neurotransmitter that runs voluntary muscle contraction, the parasympathetic nervous system, and a great deal of memory and attention circuitry in the brain.
3. Methyl donation. Oxidised to betaine, choline donates methyl groups in the pathway that converts homocysteine back to methionine. This puts it in direct partnership with folate and vitamin B12 — when folate is low, the body leans harder on choline for the same job, and vice versa.
4. Fat export from the liver. The liver packages triglycerides into VLDL particles for export, and those particles require phosphatidylcholine. Without enough choline, fat accumulates in the liver instead of leaving it.

That last mechanism is the clearest clinical link. Corbin and Zeisel reviewed the role of choline metabolism in non-alcoholic fatty liver disease and its progression; the connection is well established at the biochemical level and has been demonstrated in controlled human depletion studies, where healthy volunteers fed a choline-deficient diet developed liver fat and abnormal liver enzymes that resolved on repletion.

Pregnancy is where choline has produced its most striking trial result. Requirements rise sharply in pregnancy and lactation because the fetus and infant demand large amounts for membrane and nervous-system construction. Caudill and colleagues randomised pregnant women in the third trimester to two levels of choline intake and found that the higher intake was associated with faster infant information-processing speed measured in the first year of life — a small, controlled trial, but a rare piece of randomised evidence connecting a specific maternal nutrient intake to a measured infant cognitive outcome.

Our Choline page covers the nutrient in full, including the forms found in supplements and the food sources ranked. Cauliflower's contribution is one line of that story, but it is a line worth knowing.

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Folate, Potassium and the Rest of the Panel

Folate. Around 57 micrograms per 100 grams, against an adult requirement of 400 micrograms of dietary folate equivalents. Folate is required for DNA synthesis and red blood cell formation, and its importance before and during early pregnancy — where adequate intake reduces the risk of neural tube defects — is one of the best-established facts in nutrition. Folate is heat-sensitive and water-soluble, so it follows vitamin C's fate in the pan: steam rather than boil, or keep the water. Note the partnership with choline described above — the two nutrients back each other up in the methylation pathway, and cauliflower happens to supply both. See Vitamin B9.

Potassium. Around 300 milligrams per 100 grams. Adult adequate intakes are in the region of 2,600 to 3,400 milligrams a day and most people do not reach them, so every vegetable contribution counts. Potassium's role in blood pressure regulation, working against sodium at the kidney, is well established. See Potassium.

Fibre. Around 2 grams per 100 grams — a mix of insoluble cellulose that adds bulk and fermentable components that feed colonic bacteria. The fermentable portion is also, honestly, part of why cauliflower produces gas in some people; that trade-off is dealt with on our FODMAPs and tolerance page.

Vitamin B6 and pantothenic acid appear in modest but genuine amounts, and cauliflower supplies small quantities of most minerals — calcium, magnesium, phosphorus, manganese — without being a notable source of any of them.

And then there is the thing that never appears on a panel at all: the glucosinolates. They are not nutrients in the classical sense — no deficiency disease, no recommended intake — but they are the most-studied compounds in the vegetable, and they have their own page here.

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Colour Changes the Nutrients

Cauliflower comes in orange, purple and green as well as white, and the colours are not cosmetic dye jobs — each one is a real genetic change that adds a compound the white curd lacks.

Orange cauliflower traces to a single mutation. Lu and colleagues identified the Or gene, which encodes a DnaJ cysteine-rich domain-containing protein, and showed that the mutant version triggers the formation of chromoplasts — the organelles that store carotenoids — in tissue that would normally have none. The curd accumulates beta-carotene it otherwise would not, and beta-carotene is a vitamin A precursor. The finding has been used well beyond cauliflower, as a tool for raising carotenoid content in other crops.

Purple cauliflower has a comparable story. Chiu and colleagues showed that the purple curd arises from activation of a MYB transcription factor, which switches on anthocyanin production in the curd. Anthocyanins are the same pigment class that colours red cabbage, blueberries and blackcurrants, and they bring antioxidant activity the white curd does not have. Our Red Cabbage Anthocyanins page covers that pigment family in depth.

Green cauliflower and Romanesco simply retain chlorophyll in the curd, which normally develops shaded by the plant's own leaves and therefore stays white. With chlorophyll comes somewhat more of the nutrients associated with green tissue.

Practically: if you see coloured cauliflower and the price is not silly, it is a genuine upgrade rather than a novelty. Cook the purple gently — anthocyanins are water-soluble and will bleed into boiling water, taking the colour with them. Roasting or steaming keeps the colour on the plate.

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Putting It on the Plate

1. Aim for a serving or two of cauliflower a week as part of a wider cruciferous habit rather than trying to make one vegetable carry a nutrient on its own.
2. Include some raw. Thin-sliced florets in a salad, or grated raw with a mustard vinaigrette, preserve the full vitamin C figure. Start with a small amount if you are gas-prone.
3. Steam or roast the rest. Steam to just-tender; roast hot until the edges brown. Both beat boiling for retention of vitamin C, folate and choline.
4. Keep the cooking water when you boil. It carries the vitamin C, folate and choline that left the vegetable. Cauliflower soup exists for a reason.
5. Add fat. Olive oil, butter or the fat in a cheese sauce improves vitamin K absorption, and it makes the vegetable considerably more appealing.
6. Pair it with iron sources. Its vitamin C increases non-haem iron absorption from beans, lentils, whole grains and greens in the same meal.
7. Eat the stem and leaves. They are edible, nutritious and usually thrown away.
8. If you eat few animal foods, count the choline. Cauliflower is one of your better vegetable options for it, and worth keeping in regular rotation for that reason alone.
9. Buy heads with crisp green leaves and use them within a few days — vitamin C declines throughout storage.

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Key Research Papers

1. Carr AC, Maggini S. Vitamin C and immune function. Nutrients. 2017;9(11):1211. — doi:10.3390/nu9111211
2. Pellegrini N, Chiavaro E, Gardana C, et al. Effect of different cooking methods on color, phytochemical concentration, and antioxidant capacity of raw and frozen brassica vegetables. Journal of Agricultural and Food Chemistry. 2010;58(7):4310-4321. — doi:10.1021/jf904306r
3. Volden J, Bengtsson GB, Wicklund T. Glucosinolates, L-ascorbic acid, total phenols, anthocyanins, antioxidant capacities and colour in cauliflower (Brassica oleracea L. ssp. botrytis): effects of long-term freezer storage. Food Chemistry. 2009;112(4):967-976. — doi:10.1016/j.foodchem.2008.07.018
4. Ahmed FA, Ali RFM. Bioactive compounds and antioxidant activity of fresh and processed white cauliflower. BioMed Research International. 2013;2013:367819. — doi:10.1155/2013/367819
5. Booth SL, Sadowski JA, Pennington JAT. Phylloquinone (vitamin K1) content of foods in the U.S. Food and Drug Administration's Total Diet Study. Journal of Agricultural and Food Chemistry. 1995;43(6):1574-1579. — doi:10.1021/jf00054a030
6. Booth SL, Centurelli MA. Vitamin K: a practical guide to the dietary management of patients on warfarin. Nutrition Reviews. 1999;57(9):288-296. — doi:10.1111/j.1753-4887.1999.tb01815.x
7. Zeisel SH, da Costa KA. Choline: an essential nutrient for public health. Nutrition Reviews. 2009;67(11):615-623. — doi:10.1111/j.1753-4887.2009.00246.x
8. Wallace TC, Fulgoni VL. Assessment of total choline intakes in the United States. Journal of the American College of Nutrition. 2016;35(2):108-112. — doi:10.1080/07315724.2015.1080127
9. Corbin KD, Zeisel SH. Choline metabolism provides novel insights into nonalcoholic fatty liver disease and its progression. Current Opinion in Gastroenterology. 2012;28(2):159-165. — doi:10.1097/MOG.0b013e32834e7b4b
10. Caudill MA, Strupp BJ, Muscalu L, Nevins JEH, Canfield RL. Maternal choline supplementation during the third trimester of pregnancy improves infant information processing speed: a randomized, double-blind, controlled feeding study. The FASEB Journal. 2018;32(4):2172-2180. — doi:10.1096/fj.201700692RR
11. Institute of Medicine. Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. Washington, DC: National Academies Press; 1998. — doi:10.17226/6015
12. Lu S, Van Eck J, Zhou X, et al. The cauliflower Or gene encodes a DnaJ cysteine-rich domain-containing protein that mediates high levels of beta-carotene accumulation. The Plant Cell. 2006;18(12):3594-3605. — doi:10.1105/tpc.106.046417
13. Chiu LW, Zhou X, Burke S, Wu X, Prior RL, Li L. The purple cauliflower arises from activation of a MYB transcription factor. Plant Physiology. 2010;154(3):1470-1480. — doi:10.1104/pp.110.164160
14. Verkerk R, Schreiner M, Krumbein A, et al. Glucosinolates in Brassica vegetables: the influence of the food supply chain on intake, bioavailability and human health. Molecular Nutrition & Food Research. 2009;53(S2):S219-S265. — doi:10.1002/mnfr.200800065

Live PubMed Searches

1. PubMed: cauliflower vitamin C retention
2. PubMed: choline intake in populations
3. PubMed: choline deficiency and fatty liver
4. PubMed: vitamin K and warfarin consistency
5. PubMed: vitamin C and non-haem iron absorption
6. PubMed: orange cauliflower and the Or gene

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Connections

• Cauliflower — the main topic page.
• Cauliflower — Benefits Deep Dive — the hub for this set of articles.
• Cauliflower: History and Origins — including the genetics behind the orange and purple varieties.
• Cauliflower Glucosinolates and Indoles — the compounds that never make it onto a nutrition label.
• Cauliflower Rice and the Low-Carb Swap — what you gain and lose in the substitution.
• Cauliflower FODMAPs, Goitrogens and Tolerance — the fibre trade-off and the thyroid question.
• Vitamin C — the nutrient in full.
• Vitamin K — clotting, bone and vascular calcification.
• Choline — requirements, forms and food sources ranked.
• Vitamin B9 (Folate) — choline's partner in the methylation pathway.
• Potassium — blood pressure and the sodium balance.
• Broccoli — more vitamin K, less choline.
• Red Cabbage Anthocyanins — the pigment family behind purple cauliflower.
• Eggs — the richest everyday source of choline, for comparison.

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