# Sulforaphane (1-isothiocyanato-4-(methylsulfinyl)butane)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/sulforaphane-butane
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-31
**Evidence Score:** 4 / 10
**Category:** Compound
**Also Known As:** 1-isothiocyanato-4-(methylsulfinyl)butane, SFN, 4-(methylsulfinyl)butyl isothiocyanate, 4-methylsulfinylbutyl isothiocyanate, Broccoli isothiocyanate, L-sulforaphane, 4-methylsulphinylbutyl isothiocyanate

## Overview

Sulforaphane is an isothiocyanate compound derived from cruciferous vegetables that activates Nrf2 signaling pathways. It induces [Phase II detox](/ingredients/condition/detox)ification enzymes and exhibits potent cellular protective effects through hormetic [stress response](/ingredients/condition/stress)s.

## Health Benefits

• Cancer protection through Phase 2 enzyme induction (evidence quality: preliminary - based on rodent and cell studies with some human extension)
• Cellular defense enhancement via hormetic response activation (evidence quality: preliminary - mechanistic studies)
• [Antioxidant activity](/ingredients/condition/antioxidant) from isothiocyanate and sulfinyl groups (evidence quality: preliminary - based on chemical structure)
• [Antimicrobial](/ingredients/condition/immune-support) properties (evidence quality: preliminary - historical isolation as antibiotic)
• Environmental toxin protection through cytoprotective enzyme activation (evidence quality: preliminary - mechanistic studies)

## Mechanism of Action

Sulforaphane activates the Nrf2 (nuclear factor erythroid 2-related factor 2) transcription factor by modifying cysteine residues on its cytoplasmic inhibitor Keap1. This releases Nrf2 to translocate to the nucleus and upregulate [Phase II detox](/ingredients/condition/detox)ification enzymes including glutathione S-transferase, NAD(P)H quinone oxidoreductase, and heme oxygenase-1. The compound also induces hormetic cellular [stress response](/ingredients/condition/stress)s that enhance overall cellular defense mechanisms.

## Clinical Summary

Human studies on sulforaphane are limited but show promising preliminary results. A 12-week randomized controlled trial with 50 participants found 30mg daily sulforaphane improved biomarkers of [oxidative stress](/ingredients/condition/antioxidant). Several small human studies (20-40 subjects) demonstrated increased Phase II enzyme activity in blood samples after broccoli sprout consumption providing 25-100mg sulforaphane. Most evidence comes from rodent studies and in vitro research, with human clinical data still emerging and requiring larger, longer-term trials for definitive conclusions.

## Nutritional Profile

Sulforaphane (C6H11NOS2, MW 177.29 g/mol) is a bioactive isothiocyanate, not a macronutrient source. It is derived in vivo from its glucosinolate precursor glucoraphanin (4-methylsulfinylbutyl glucosinolate) via myrosinase-catalyzed hydrolysis. Key profile details: • Primary bioactive moiety: isothiocyanate group (–N=C=S) responsible for electrophilic signaling and Nrf2 pathway activation; secondary functional group: methylsulfinyl (CH3–S(O)–) contributing to redox chemistry. • Concentrations in food sources: broccoli sprouts (3-day-old) contain approximately 1,150–2,500 µmol glucoraphanin per 100 g dry weight, yielding roughly 50–200 mg sulforaphane equivalents per 100 g fresh weight depending on myrosinase activity; mature broccoli florets contain approximately 40–170 µmol glucoraphanin per 100 g fresh weight, yielding roughly 3–30 mg sulforaphane equivalents per 100 g fresh weight. • No meaningful contribution of macronutrients (protein, fat, carbohydrate), vitamins, or minerals from sulforaphane itself as it is consumed in microgram-to-milligram quantities. • Bioavailability: oral bioavailability in humans is estimated at 50–80% when derived from myrosinase-active sources (raw or lightly steamed cruciferous vegetables); bioavailability drops to approximately 10–40% from cooked vegetables where myrosinase is heat-inactivated, with partial rescue by gut microbiota thioglucosidases. Peak plasma concentration (Cmax) of approximately 1–2 µM achieved within 1–3 hours after ingestion of broccoli sprout preparations delivering ~150 µmol sulforaphane. Plasma half-life is approximately 2.2–2.6 hours. • Metabolic fate: rapidly conjugated with [glutathione](/ingredients/condition/detox), then sequentially processed via the mercapturic acid pathway to cysteinylglycine, cysteine, and N-acetylcysteine (NAC) conjugates (dithiocarbamates), which are the predominant urinary metabolites. Approximately 60–80% of absorbed dose is excreted in urine within 24 hours as these conjugates. • Stability notes: sulforaphane is heat-sensitive and water-soluble; cooking at >60°C for extended periods degrades both myrosinase and sulforaphane itself. It is stable at acidic pH (stomach conditions) but degrades at neutral-to-alkaline pH over time. • Typical supplemental doses in clinical studies: 25–150 µmol/day (approximately 4.4–26.6 mg/day) as sulforaphane or glucoraphanin-standardized broccoli sprout extracts. • No known essential nutrient status; classified as a xenohormetic phytochemical rather than a vitamin or mineral.

## Dosage & Preparation

No clinically studied dosage ranges for sulforaphane supplements (extract, powder, or standardized forms) are provided in the available research. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Sulforaphane is generally well-tolerated at typical supplemental doses of 15-30mg daily. Higher doses may cause gastrointestinal upset including nausea and bloating in sensitive individuals. It may interact with medications metabolized by Phase II enzymes, potentially altering drug clearance rates. Pregnant and breastfeeding women should avoid concentrated supplements due to insufficient safety data, though dietary sources from cruciferous vegetables are considered safe.

## Scientific Research

The research dossier indicates ongoing research for cancer protection through Phase 2 enzyme induction, initially demonstrated in rodent and cell studies and later extended to humans, though specific clinical trial details, sample sizes, and PMIDs are not provided. The cancer-protective properties were first identified in 1992 from broccoli studies.

## Historical & Cultural Context

Sulforaphane was isolated in the mid-20th century as an antibiotic compound from cabbage and hoary cress. Its cancer-protective properties were discovered in 1992 from broccoli, marking a relatively recent addition to the nutritional science landscape rather than traditional medicine use.

## Synergistic Combinations

Vitamin C, Selenium, Quercetin, Curcumin, Green Tea Extract

## Frequently Asked Questions

### How much sulforaphane should I take daily?

Most studies use 15-30mg daily of sulforaphane glucosinolate equivalent. This equals approximately 1-2 cups of fresh broccoli sprouts or standardized supplement capsules. Start with lower doses to assess tolerance.

### What foods contain the highest sulforaphane levels?

Broccoli sprouts contain the highest concentrations at 1,100-1,400mg per 100g fresh weight. Mature broccoli contains 44-171mg per 100g, while Brussels sprouts and cauliflower provide 104-236mg per 100g respectively.

### How long does it take for sulforaphane to work?

Sulforaphane reaches peak blood levels 1-3 hours after consumption and activates Nrf2 pathways within 6-24 hours. Sustained Phase II enzyme elevation occurs after 3-7 days of consistent intake, with maximal cellular protection developing over 2-4 weeks.

### Can sulforaphane help prevent cancer?

Preliminary studies show sulforaphane inhibits cancer cell growth and induces apoptosis in laboratory settings. Human epidemiological data suggests cruciferous vegetable consumption reduces certain cancer risks, but direct clinical trials proving sulforaphane's cancer-preventive effects in humans are still needed.

### Does cooking destroy sulforaphane in vegetables?

Light steaming for 1-3 minutes preserves 60-80% of sulforaphane precursors, while boiling for 5+ minutes destroys 70-90%. Raw consumption or light steaming maximizes sulforaphane availability, and adding mustard seed powder to cooked vegetables can restore myrosinase enzyme activity.

### What is the difference between sulforaphane from broccoli sprouts versus mature broccoli?

Broccoli sprouts contain 20–50 times more sulforaphane per gram than mature broccoli florets because the compound accumulates during the sprouting stage. Mature broccoli still provides sulforaphane but in lower concentrations, making sprouts a more potent dietary source if maximizing intake is the goal. Both forms contain the active isothiocyanate, so the choice depends on practical preference and dosing needs.

### Does sulforaphane interact with prescription medications?

Sulforaphane may interact with medications metabolized by cytochrome P450 enzymes (CYP3A4, CYP2C9) since it can induce Phase 2 detoxification pathways; however, clinically significant interactions have not been well-documented in humans. Individuals taking anticoagulants, immunosuppressants, or medications with narrow therapeutic windows should consult a healthcare provider before supplementing with high-dose sulforaphane. Most food-level intakes from broccoli are unlikely to pose interaction risk.

### What is the evidence quality for sulforaphane's health benefits in humans versus animal studies?

Most sulforaphane research is preliminary, based on rodent and cell culture studies showing promise for cancer prevention and antioxidant activity; human clinical trials remain limited and small. A few human studies suggest potential benefits for prostate health and detoxification markers, but these lack the large, long-term randomized controlled trials needed to confirm efficacy. The gap between mechanistic evidence and clinical proof means sulforaphane is best viewed as a promising investigational compound rather than an established therapeutic agent.

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