Evidence-based·Last reviewed May 30, 2026·How we grade evidence

Broccoli sprout

Botanical

Useful mainly for people wanting a concentrated dietary source of sulforaphane.

Quick decision guide

May help most

people wanting a concentrated dietary source of sulforaphane

Common dosing range

30–100 g/day raw sprouts, or extract giving 30–90 mg sulforaphane

When to expect effects

Days to weeks depending on outcome

Watch out for

Raw sprouts carry foodborne illness risk; avoid raw in pregnancy

What is it

Broccoli sprouts are 2-7 day old broccoli seedlings, contains 20-50 times more glucoraphanin than mature broccoli per gram. Glucoraphanin converts to sulforaphane via the enzyme myrosinase, providing the most concentrated dietary source of this Nrf2-activating compound.

Is it worth it for you?

Use this as a quick fit check, not a diagnosis.

Worth considering if…

You want a concentrated, real food source of sulforaphane
You eat sprouts raw or use a myrosinase-active extract
You source sprouts safely and rinse them

Probably skip if…

You want a proven treatment for a specific disease
You are pregnant and would eat raw sprouts
You rely on cooked sprouts (cooking destroys myrosinase)

Evidence at a glance

phase ii detoxification enzyme induction

Good Evidence
Effect
Reliable enzyme/excretion changes
Best fit
people wanting Nrf2-mediated detox enzyme activation
Time
Days

h. pylori suppression

Limited Evidence
Effect
Modest reduction in markers
Best fit
people with H. pylori, as an adjunct
Time
Weeks

airway inflammation / asthma

Limited Evidence
Effect
Inconsistent
Best fit
people with airway inflammation seeking an adjunct
Time
Weeks

autism behavioral symptoms

Mixed Evidence
Effect
Preliminary
Best fit
people with autism spectrum disorder, under clinical supervision
Time
Weeks

Evidence for 4 uses

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

phase ii detoxification enzyme induction

Biomarker support
Good Evidence

Sulforaphane from broccoli sprouts reliably activates the Nrf2 pathway and induces phase II enzymes such as glutathione transferases and NAD(P)H quinone dehydrogenase, increasing excretion of certain airborne pollutants in human studies. These are biomarker and enzyme-activity changes, not demonstrated disease prevention. Raw sprouts or myrosinase-active extracts are needed for sulforaphane formation.

Effect size
Reliable enzyme/excretion changes
Time to effect
Days
Best fit
people wanting Nrf2-mediated detox enzyme activation

Bottom line: Reliably boosts detox-enzyme activity and pollutant excretion at the biomarker level.

SourceKikuchi et al., 2015 — PMCYanaka et al., 2009 — PubMed

h. pylori suppression

Biomarker support
Limited Evidence

Small trials show broccoli sprout intake can reduce markers of H. pylori colonization (such as urea breath test or stool antigen values), though it rarely eradicates the infection. Effects are partial and not a substitute for standard antibiotic therapy. Evidence is limited.

Effect size
Modest reduction in markers
Time to effect
Weeks
Best fit
people with H. pylori, as an adjunct

Bottom line: May modestly lower H. pylori burden but does not replace eradication treatment.

SourceChang et al., 2015 — PMCYanaka et al., 2009 — PubMed

airway inflammation / asthma

Supplement benefit
Limited Evidence

Sulforaphane has been studied for airway inflammation and asthma, with some trials showing antioxidant or anti-inflammatory effects and others showing no clinical benefit. Results are inconsistent. It is not an established asthma therapy.

Effect size
Inconsistent
Time to effect
Weeks
Best fit
people with airway inflammation seeking an adjunct

Bottom line: Mixed evidence for airway inflammation; not a reliable asthma treatment.

Evidence is mixed

Some airway trials report anti-inflammatory effects while others find no clinical improvement.

SourceSudini et al., 2016 — PMC· conflictingDuran et al., 2016 — PMC· conflicting
SourceSudini et al., 2016 — PMCDuran et al., 2016 — PMC

autism behavioral symptoms

Disease adjunct
Mixed Evidence

A few small trials of sulforaphane reported improvements in behavioral measures in autism spectrum disorder, but results are preliminary and not consistently replicated. Studies are small and outcomes vary. Use only under clinical supervision.

Effect size
Preliminary
Time to effect
Weeks
Best fit
people with autism spectrum disorder, under clinical supervision

Bottom line: Preliminary signal for autism behavioral symptoms; far from established.

Evidence is mixed

Early trials are small and replication has been inconsistent.

SourceZimmerman et al., 2021 — PMC· conflictingMagner et al., 2023 — PMC· conflicting
SourceZimmerman et al., 2021 — PMCMagner et al., 2023 — PMC

How it works

Three-day-old broccoli sprouts are the richest natural source of glucoraphanin, a glucosinolate that converts to sulforaphane. Sulforaphane is the active compound that activates the Nrf2 transcription factor, inducing phase II detoxification enzymes (glutathione transferases, NAD(P)H quinone dehydrogenase, heme oxygenase-1) that neutralize toxins and oxidative stress. Broccoli sprouts (raw, lightly chewed) provide both glucoraphanin and active myrosinase together, enabling sulforaphane formation during digestion. Cooking destroys myrosinase, dramatically reducing sulforaphane yield from cooked sprouts or mature broccoli. This is why sprouts and standardized extracts have become the focus of clinical research. Research supports broccoli sprouts/sulforaphane for diverse outcomes: airway inflammation, blood pressure, H. pylori suppression, autism behavioral symptoms, possible cancer prevention via detoxification.

How to take it

1. Typical dose
30–100 g/day raw sprouts, or extract providing 30–90 mg sulforaphane (or 30–300 mg glucoraphanin)
2. Timing
No fixed time; daily consistency matters
3. With food
Eat raw or lightly chewed; add mustard powder to cooked broccoli to restore myrosinase
4. How long to try
Daily consistent use; weeks for measurable effects

What to track

GI tolerance
Targeted outcome (e.g. airway symptoms)
Use of a reputable sprout source

3 commercial forms

Compare the main delivery options and what they’re best suited for.

Fresh broccoli sprouts (raw)

Best for sulforaphane formation; growing at home is option.

Provides glucoraphanin + active myrosinase.

Broccoli sprout extract (with myrosinase)

Common supplement format; ensures activity.

Convenient and standardized.

Stabilized sulforaphane

Newer, more expensive option; bypasses myrosinase need.

Direct active compound; bypasses conversion.

Safety

Know the common side effects, key cautions, and who should avoid it.

Common side effects

Mild GI symptoms with concentrated sulforaphane

Serious risks

  • Foodborne illness from raw sprouts (Salmonella, E. coli) if poorly sourced

Who should avoid it

  • Pregnant women (avoid raw sprouts)
  • Iodine-deficient individuals at very high intakes (goitrogenic concern)
  • Warfarin users should keep intake consistent

Pregnancy & breastfeeding

Avoid raw sprouts in pregnancy due to foodborne illness risk.

Interactions

WarfarinMinor

Vitamin K in fresh sprouts may affect anticoagulation if intake varies

Drugs metabolized by phase I/II enzymesMinor

May theoretically alter drug-metabolizing enzyme activity

Food sources

Fresh broccoli sprouts (raw)

Amount
1/2 cup (40g)
%DV
—

Mature broccoli

Amount
1 cup (~5-10% sprout glucoraphanin)
%DV
—

Choosing a product

What to look for on the label — and what to be skeptical of.

Look for…

Standardized sulforaphane or glucoraphanin content
Myrosinase-active or co-supplied myrosinase
Reputable, contaminant-tested source

Be skeptical of…

Prevents or cures cancer
Whole-body detox
Cures autism or asthma

Frequently asked questions

How are broccoli sprouts different from mature broccoli?⌄

Sprouts contain 20-50x more glucoraphanin per gram. A small handful of sprouts equals much more mature broccoli for sulforaphane intake.

Can I grow my own?⌄

Yes, easily. Soak broccoli seeds, rinse 2-3x daily in a sprouting jar. Harvest at 3-5 days. Inexpensive and provides consistent active sprouts.

Is cooked broccoli still useful?⌄

Yes for general nutrition (fiber, vitamins). Sulforaphane formation is dramatically reduced. Adding mustard powder restores some activity.

Are sprouts safe?⌄

Raw sprouts carry low but real foodborne illness risk. Pregnant women and immunocompromised individuals should avoid raw sprouts. Choose reputable sources.

References by claim

phase ii detoxification enzyme induction

Kikuchi et al., 2015 — PMC (2015) link

Yanaka et al., 2009 — PubMed (2009) link

h. pylori suppression

Chang et al., 2015 — PMC (2015) link

airway inflammation / asthma

Sudini et al., 2016 — PMC (2016) link

Duran et al., 2016 — PMC (2016) link

autism behavioral symptoms

Zimmerman et al., 2021 — PMC (2021) link

Magner et al., 2023 — PMC (2023) link

Track Broccoli sprout with Pilora

Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.

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Evidence-based·Last reviewed May 30, 2026·Evidence current as of May 30, 2026·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.