What is sulforaphane?

Sulforaphane is an isothiocyanate formed from glucoraphanin in cruciferous vegetables, especially broccoli sprouts. It is known for activating cellular defense pathways involved in antioxidant and detoxification responses.

What are the potential benefits of sulforaphane?

Research suggests it may support antioxidant defenses, phase II detox enzymes, and inflammation modulation. It is also studied for potential roles in cardiometabolic and neuroprotective support, with evidence varying by condition and product.

What is a typical sulforaphane dosage?

Common supplemental ranges are about 20–100 mg per day, depending on the product and its sulforaphane yield. Start low and follow the label, especially if using concentrated extracts.

How do broccoli sprouts produce sulforaphane?

Sulforaphane is produced when the enzyme myrosinase converts glucoraphanin after the plant is chopped, chewed, or otherwise damaged. Some supplements include myrosinase or rely on gut conversion, which can affect consistency.

Is sulforaphane safe for everyone?

Sulforaphane from foods is generally well tolerated, while supplements may cause gastrointestinal upset in some people. If you are pregnant, breastfeeding, have a thyroid condition, or take medications, consult a clinician before using high-dose supplements.

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Sulforaphane

Moderate study situation·7/10

A higher score indicates better study conditions, but not necessarily effectiveness.

A phytochemical in broccoli sprouts, sulforaphane is a researched antioxidant with roles in detoxification, inflammation modulation, and cellular protection.

Anti-Aging Anti-inflammatory Cardiovascular Support Cancer-inhibitor Antioxidant Neuroprotective

dose range

20–100 mg

Once daily

Consumption

Take with a source of myrosinase (raw cruciferous vegetables or supplements with active myrosinase enzyme) to enhance absorption.

Not fat-soluble.

Best time

Preferably with or around a meal containing cruciferous vegetables; morning or first meal.

Description

Sulforaphane is an isothiocyanate found in cruciferous vegetables, particularly broccoli sprouts. It is known for activating cellular defense pathways that combat oxidative stress and inflammation, and is taken for potential prevention and support in cancer, cardiovascular, and neurodegenerative conditions.

benefits

Main effects with level of evidence

Moderate

Note on evidence

Animal and preclinical trials show promising effects for various health endpoints, while human studies support safety and some benefits, but more large-scale clinical trials are needed.

Supports cellular detoxification and antioxidant defense

Strong

Sulforaphane activates Nrf2 pathways, boosting phase II detox enzymes and antioxidants, helping protect against oxidative damage.

Particularly relevant for: General adult · Individuals seeking oxidative stress protection

1 · PubMed Review: Sulforaphane and Human Health 4 · PubMed Review: Sulforaphane as an Antioxidant 5 · Examine: Sulforaphane Overview

Potential cancer risk reduction

Moderate

High intake is associated with reduced cancer risk, possibly due to influences on carcinogen metabolism and cell protection, though evidence is strongest for cruciferous vegetables overall, not isolated SFN supplements.

Particularly relevant for: Individuals at risk for certain cancers

1 · PubMed Review: Sulforaphane and Human Health 3 · NIH: Cruciferous Vegetables and Cancer Prevention 7 · Cochrane Review: Dietary Interventions in Cancer Prevention

Neuroprotective and cognitive support

Limited

May reduce neuroinflammation and has shown modest improvements in social interaction and behavior in some populations with autism spectrum disorder.

Particularly relevant for: Neurodevelopmental disorder care · Brain health support

2 · Clinical Trial: Sulforaphane in Autism Spectrum Disorder 5 · Examine: Sulforaphane Overview

Anti-inflammatory effects

Moderate

Reduces markers of inflammation in preclinical and some human studies.

Particularly relevant for: Individuals with inflammatory or metabolic conditions

1 · PubMed Review: Sulforaphane and Human Health 4 · PubMed Review: Sulforaphane as an Antioxidant 5 · Examine: Sulforaphane Overview

Supports cardiovascular health

Limited

Consumption is associated with improved endothelial function and blood pressure in some studies.

Particularly relevant for: Cardiovascular Support

1 · PubMed Review: Sulforaphane and Human Health 5 · Examine: Sulforaphane Overview

Safety & Information

Important safety information & known risks

For educational purposes only • not medical advice

Generally safe at recommended doses; higher doses may increase risk of stomach upset or impact thyroid in sensitive groups.

warning notices

Mild GI symptoms (nausea, diarrhea) have been reported at higher supplemental intakes.
May reduce iodine uptake and influence thyroid function, especially in those with thyroid disorders or marginal iodine status.
No known significant drug interactions, but overall clinical evidence is still emerging.
Avoid excessive sulforaphane if you have a thyroid disorder unless advised by a clinician.
Use with caution during pregnancy and lactation; consult a healthcare provider first.
Monitor for gastrointestinal upset and reduce dose or discontinue if severe symptoms occur.

Known interactions with medications

Thyroid hormone medications (potential reduced efficacy at excessive cruciferous vegetable/sulforaphane intake)

Contraindications / special precautions

Known thyroid dysfunction unless under medical supervision.
Pregnancy or lactation without clinician guidance.

interactions

Important interactions between active ingredient ↔ supplement / medication / food

Sulforaphane generally has low risk of interactions but high doses may affect thyroid function and medication efficacy in rare cases.

May reduce iodine uptake and thyroid hormone production at high cruciferous intake.

nutrient · Iodine

MonitorModerateIodineApplies mainly at high, chronic intakes or in susceptible individuals.

Why

Goitrogenic isothiocyanates in sulforaphane can impair thyroid function, particularly if iodine status is low.

recommendation

Monitor thyroid function if consuming high-dose supplements, ensure adequate iodine intake.

1 · PubMed Review: Sulforaphane and Human Health 3 · NIH: Cruciferous Vegetables and Cancer Prevention 6 · EFSA Panel Opinion: Glucosinolates in Food

mechanisms of action

Brief explanations of how it works

Nrf2 Pathway Activation

Sulforaphane stimulates the Nrf2 transcription factor, increasing antioxidant and detoxification gene expression and cellular defenses.

1 · PubMed Review: Sulforaphane and Human Health 4 · PubMed Review: Sulforaphane as an Antioxidant 5 · Examine: Sulforaphane Overview

Anti-inflammatory Signaling Modulation

Suppresses NF-κB pathway and inflammatory cytokine production.

1 · PubMed Review: Sulforaphane and Human Health 4 · PubMed Review: Sulforaphane as an Antioxidant

Sources & References

Primary literature and reviews on which these statements are based

7 sources

PubMed Review: Sulforaphane and Human Health

Overview of sulforaphane mechanisms and clinical research.

Clinical Trial: Sulforaphane in Autism Spectrum Disorder

Randomized controlled trial, SFN effects in autism.

NIH: Cruciferous Vegetables and Cancer Prevention

NIH fact sheet on cruciferous vegetables and disease risk.

PubMed Review: Sulforaphane as an Antioxidant

Review of SFN's antioxidant/anti-inflammatory actions.

Examine: Sulforaphane Overview

Evidence-based summary of health effects, safety, and dosage.

EFSA Panel Opinion: Glucosinolates in Food

Safety and intake information on glucosinolates/sulforaphane.

Cochrane Review: Dietary Interventions in Cancer Prevention

Cruciferous vegetables and cancer prevention evidence.

Last updated: March 7, 2026

This information is for educational purposes only and does not replace medical advice.