Herb & supplement monograph

Cauliflower Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated June 2026

What is this page for?

First and foremost: how Cauliflower interacts with medications. The heart of this page is the interaction list — every drug Cauliflower is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Cauliflower is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Cauliflower Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Cauliflower drug interaction appears low for most people. None of the listed interactions are rated major, and every one traces back to a single, mostly theoretical concern about how the body clears certain medications.

Interactions deserving the most attention

Every interaction on the list involves medications broken down by the same liver enzyme, which cauliflower and related vegetables may speed up modestly. Preliminary human research shows this enzyme effect is real, but whether it meaningfully changes drug levels has not been confirmed. The medications where this could matter most are those with a narrow margin, such as clozapine, where even small shifts in blood levels can affect how well the drug works. Cyclobenzaprine is cleared the same way and is worth similar awareness.

What the rest of the list means

A long list of moderate interactions can look worrying, but here it reflects one shared mechanism applied across many drugs, not many separate proven problems. For most of these medications, the predicted effect remains theoretical and has not been shown to cause meaningful changes in people.

Check your medications against Cauliflower

Based on HelloPharmacist’s Cauliflower interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Cauliflower

186 medications have a known interaction with Cauliflower, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Cauliflower using our pharmacist-reviewed interaction data.

AI summaries are generated from our Cauliflower interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Cauliflower combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Cauliflower affects

Every type of medication (drug category) Cauliflower is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Cauliflower interacts with

Cytochrome P450 1a2 (cyp1a2) Substrates

Cytochrome P450 1A2 (Cyp1A2) Substrates

Preliminary clinical evidence suggests that eating cruciferous vegetables, including broccoli, cauliflower, daikon radish sprouts, and cabbage, can increase cytochrome P450 1A2 (CYP1A2) activity by 14% to 27%. Theoretically, cauliflower might increase the clearance and decrease the effects of drugs metabolized by CYP1A2. Some drugs metabolized by CYP1A2 include clozapine (Clozaril), cyclobenzaprine (Flexeril), fluvoxamine (Luvox), haloperidol (Haldol), imipramine (Tofranil), mexiletine (Mexitil), olanzapine (Zyprexa), pentazocine (Talwin), propranolol (Inderal), tacrine (Cognex), theophylline, zileuton (Zyflo), zolmitriptan (Zomig), and others.

Likelihood Possible Evidence B

Monograph

Cauliflower: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed June 2026 ·

The bottom line

Cauliflower is a nutritious cruciferous vegetable that provides vitamin C, fiber, and plant compounds called glucosinolates. As a food it is healthy and safe for most people, but there is no strong proof that cauliflower supplements treat or prevent any specific disease. Enjoy it as part of a balanced diet rather than relying on pills.

Scientific name: Brassica oleracea var. botrytis
Family: Brassicaceae
Part used: Edible flower head (curd); leaves and stalk are also eaten
Common forms: Fresh or frozen vegetable, cooked dishes, riced cauliflower, powder, and capsules or extracts

People commonly use it for

General nutrition and a low-carb vegetable
Source of vitamin C and fiber
Antioxidant support
Digestive and gut health
Part of a heart-healthy diet

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallLikely safe

Cauliflower is safe and nutritious for most people when eaten as a food.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using in greater amounts than found in foods.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using in greater amounts than found in foods.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Cauliflower is a popular vegetable that belongs to the cruciferous (cabbage) family, alongside broccoli, kale, and Brussels sprouts. The part we usually eat is the tightly packed white flower head, called the curd, though the leaves and stalk are edible too. Colorful varieties also exist, including orange, green, and purple types.

Cauliflower is grown around the world and is a common part of many diets. It is eaten raw, steamed, roasted, mashed, or ground into "rice" as a lower-carbohydrate substitute for grains. It is also sold as a dried powder or, less commonly, as capsules and extracts marketed as supplements.

Most of the interest in cauliflower comes from the nutrients and natural plant compounds it contains, similar to other cruciferous vegetables that have been studied for general health benefits.

How it works

Cauliflower contains natural compounds called glucosinolates. When the vegetable is chopped or chewed, these can break down into substances such as sulforaphane and indoles, which have been studied in laboratory and animal research for antioxidant and cell-protective effects.

It also provides vitamin C, fiber, folate, and vitamin K, plus other plant antioxidants. Fiber supports digestion and gut bacteria, while the antioxidants may help the body deal with everyday cell stress.

It is important to know that much of the research on these compounds was done in test tubes or animals using concentrated amounts. This does not prove that eating cauliflower, or taking a cauliflower supplement, produces the same effects in people.

Effectiveness

Does Cauliflower work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 7 uses evaluated

7 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

For Cauliflower, current evidence isn’t strong enough to rate any specific use. The conditions it has been studied for are listed below.

Also studied for 7 conditions — evidence insufficient to rate

Insufficient Reliable Evidence To Rate Bladder cancer