🥦Rankings/Sulforaphane

Best Sulforaphane Supplements
Ranked 2026

Q: What is the best sulforaphane supplement?

The best sulforaphane supplements pair glucoraphanin (the stable precursor) with active myrosinase enzyme — because sulforaphane itself is unstable and degrades rapidly. Products standardized to Avmacol, Prostaphane, or TrueBroc (GRS/SGS) with verified myrosinase activity deliver the most consistent bioavailable sulforaphane. Broccoli sprout powder without confirmed myrosinase content is unreliable. Avoid supplements listing only 'sulforaphane' without specifying the glucoraphanin + myrosinase delivery system — heat processing destroys the myrosinase enzyme required for conversion.

Q: What does sulforaphane do?

Sulforaphane is an isothiocyanate that activates the Nrf2 transcription factor — the master regulator of cellular defense. Nrf2 activation upregulates 200+ cytoprotective genes including Phase 2 detoxification enzymes (glutathione S-transferase, NQO1), antioxidant response elements, and anti-inflammatory pathways. Clinical evidence shows benefits in: cancer chemoprotection (carcinogen detoxification via GSTM1/NQO1 induction), autism spectrum disorder (behavior and social responsiveness improvements in a 2014 Johns Hopkins RCT), H. pylori eradication support, air pollution detoxification (benzene and acrolein excretion increased 61% and 23%), and metabolic health (insulin sensitivity, liver enzyme reduction in NAFLD).

Q: How much sulforaphane should I take per day?

Clinical trials have used doses ranging from 10 μmol/day (general antioxidant/Nrf2 baseline) to 200 μmol/day (high-dose autism RCTs). Most well-designed human trials cluster at 30–100 μmol/day for cancer chemoprotection and metabolic benefits. The 2014 Singh/Fahey autism RCT used 50–150 μmol/day (weight-dosed). For air pollution detoxification (Egner et al., 2014), broccoli sprout beverage delivering ~600 μmol glucoraphanin daily (yielding ~40 μmol sulforaphane) increased benzene excretion 61%. Practical target: 30–60 μmol/day of bioavailable sulforaphane for most evidence-based goals. Always take with a meal — fat improves absorption and reduces GI irritation.

Q: Is glucoraphanin the same as sulforaphane?

No — glucoraphanin is the stable glucosinolate precursor found in broccoli and supplements. Sulforaphane is the bioactive isothiocyanate formed when myrosinase enzyme cleaves glucoraphanin. In fresh broccoli, myrosinase is released when you chew the vegetable. In supplements, heat processing (common in broccoli powder and capsule manufacturing) destroys myrosinase — leaving glucoraphanin that cannot convert to sulforaphane without an external enzyme source. High-quality supplements solve this by: (1) adding stabilized myrosinase (daikon radish extract, mustard seed powder), (2) using proprietary stabilized sulforaphane delivery (Prostaphane), or (3) spray-drying at low temperature to preserve enzyme activity. A supplement listing only 'broccoli extract' or 'broccoli sprout powder' without specifying myrosinase content should be considered lower-tier.

Q: Can I just eat broccoli sprouts instead of a supplement?

Yes — fresh broccoli sprouts (3–5 day old) are the highest natural source of glucoraphanin at 20–50x higher concentration than mature broccoli. Chewing fresh sprouts activates myrosinase and delivers highly bioavailable sulforaphane. The Fahey/Talalay Johns Hopkins research group that identified sulforaphane's mechanism (1992) actually prefers whole sprouts over supplements for bioavailability. However, sprout growing is time-intensive, glucoraphanin content varies by seed variety and growing conditions, and travel/convenience situations favor supplements. A practical protocol: grow sprouts when possible (50 g fresh = ~40–80 μmol sulforaphane), supplement with glucoraphanin + myrosinase capsules when not. Avoid raw cruciferous sprouts if immunocompromised (contamination risk).

Q: Does sulforaphane help with autism?

There is promising but not conclusive evidence. The landmark 2014 RCT by Singh et al. (Johns Hopkins, n=29 males 13–27 years, PMID 25313065) showed sulforaphane at 50–150 μmol/day improved ABC (Aberrant Behavior Checklist), SRS (Social Responsiveness Scale), and CGI (Clinician Global Impression) scores vs. placebo over 18 weeks — with scores reverting after washout. A 2022 replication (ACTRN12614001295695) produced mixed results. The proposed mechanism involves heat shock protein normalization (fever reduces ASD symptoms in ~30% of children; sulforaphane may mimic this via HSP70 upregulation) and oxidative stress reduction. Current status: promising pilot data, not yet at evidence threshold for clinical recommendation. Johns Hopkins is running a larger Phase 2 trial (NCT02561481). Families are using it empirically; no significant safety signals at trial doses.

Q: Can sulforaphane prevent cancer?

Sulforaphane is one of the best-studied chemoprotective compounds. Mechanistic evidence is strong: it induces Phase 2 detoxification enzymes (GSTM1, NQO1) that neutralize carcinogens before DNA adduct formation; it promotes apoptosis in cancer cell lines; it inhibits histone deacetylase (HDAC), reactivating tumor suppressor genes silenced by methylation. Human epidemiological data strongly correlates cruciferous vegetable intake with reduced risk of prostate, breast, colorectal, lung, and bladder cancers — and GSTM1 genotype (determines sulforaphane detox enzyme capacity) modifies this association. Clinical trials in high-risk populations (prostate, recurrent bladder cancer) show promising biomarker improvements. However, no large RCT has demonstrated reduced cancer incidence as a primary endpoint. The mechanistic and epidemiological evidence is compelling; proof of clinical cancer prevention in humans requires larger, longer trials.

Q: What foods have the most sulforaphane?

Sulforaphane (via glucoraphanin) is concentrated in the Brassica genus. Per 100g ranking: broccoli sprouts (3-5 day) ~1,000–2,500 mg glucoraphanin; watercress ~95 mg; garden cress ~80 mg; mature broccoli (raw) ~40–65 mg; Brussels sprouts ~25–45 mg; cauliflower ~10–20 mg. Cooking dramatically reduces yield: steaming broccoli for 5+ minutes kills >50% of myrosinase activity; boiling eliminates most enzyme activity. Best cooking method: lightly steam mature broccoli for 3–4 minutes (leaves glucoraphanin intact, kills harmful bacteria, preserves partial enzyme activity) then sprinkle with mustard seed powder (provides exogenous myrosinase). Or eat raw cruciferous vegetables with thorough chewing.

The most powerful Nrf2 activator in food. Backed by 400+ human trials — but most supplements fail at delivery. Here's what actually works.

⚡ TL;DR — What Actually Works

✅ Glucoraphanin + active myrosinase — the only delivery that consistently converts to bioactive sulforaphane
✅ SGS-standardized (TrueBroc / Avmacol) — third-party verified glucosinolate content with enzyme activity
✅ Prostaphane (stabilized sulforaphane, France) — clinical-grade, used in 40+ trials, highest proof
⚠️ Broccoli sprout powder without myrosinase — conversion unreliable; heat kills the enzyme
❌ "Sulforaphane" capsules without enzyme source — shelf-unstable, low bioavailability

Updated April 2026. No sponsored rankings. Forms ranked by clinical evidence and conversion reliability.

Why Most Sulforaphane Supplements Fail

🔬 The Conversion Problem

Sulforaphane doesn't exist in broccoli. Broccoli contains glucoraphanin — a stable glucosinolate that converts to sulforaphane only when the enzyme myrosinase cleaves it.

In fresh broccoli, chewing ruptures cells and mixes glucoraphanin with myrosinase. In supplements, heat processing destroys myrosinase — leaving glucoraphanin that cannot convert without an external enzyme source.

📊 Bioavailability by Form

Fresh broccoli sprouts (chewed)~70–80%

Glucoraphanin + myrosinase capsules~50–70%

Prostaphane (stabilized SFN)~40–60%

Broccoli sprout powder (with myrosinase)~30–50%

Broccoli powder (no myrosinase)~5–20% (variable)

Sulforaphane Supplement Rankings

TIER 1

Glucoraphanin + Active Myrosinase (Avmacol / TrueBroc SGS)

The highest-bioavailability delivery system outside of fresh sprouts. These products pair standardized glucosinolate extract (SGS = sulforaphane glucosinolate) with active myrosinase enzyme — replicating the enzymatic conversion that occurs in fresh broccoli.

Why it works

✅ Glucoraphanin stable on shelf (no enzyme = no premature conversion)
✅ Active myrosinase from daikon radish or mustard seed added back
✅ Conversion triggered in GI tract at physiological pH
✅ Third-party standardized glucosinolate content (SGS / TrueBroc)

Key products

Avmacol — clinical-grade, used in NCI-funded cancer trials, provides myrosinase
Thorne Broccoli Seed Extract — SGS standardized, quality manufacturing
Life Extension Optimized Broccoli + Cruciferous Blend — includes myrosinase activator

Dosing: 30–60 μmol sulforaphane equivalent/day (check product conversion factor). Take with a meal. If using standalone glucoraphanin without added myrosinase, eat with mustard seed powder (1/4 tsp) to activate conversion.

TIER 1

Prostaphane (Stabilized Sulforaphane)

The only supplement that delivers stabilized sulforaphane directly (not a precursor). Developed by a French pharmaceutical research team and used in 40+ clinical trials, Prostaphane uses a proprietary stabilization process that extends sulforaphane half-life. Highly concentrated — 10 mg = ~57 μmol sulforaphane.

Note: Prostaphane is primarily available in Europe. U.S. availability is limited to direct import or select retailers. If you can access it, it is clinically the best-validated sulforaphane source. For U.S. users, Tier 1 glucoraphanin + myrosinase products are the practical equivalent.

TIER 2

Broccoli Sprout Powder with Stated Myrosinase Content

Low-temperature spray-dried broccoli sprout powders that specify myrosinase activity retention on the label. Conversion is less consistent than Tier 1 products but meaningfully better than plain broccoli powder. Look for: stated glucoraphanin content (mg), stated myrosinase activity (units), and independent CoA (certificate of analysis).

Check labels for: glucoraphanin content in μmol or mg, active myrosinase enzyme (stated units), and spray-dried or freeze-dried processing (not steam-treated or high-temp-extracted).

TIER 3

Sulforaphane in Multi-Ingredient Longevity Blends

Products like Athletic Greens / AG1, some NMN complexes, and anti-aging blends that include broccoli sprout extract at sub-therapeutic doses. Often 5–15 mg glucoraphanin without myrosinase — likely insufficient for the Nrf2 pathway effects shown in clinical trials. Acceptable as a broad-coverage supplement, not as a primary sulforaphane intervention.

AVOID

Generic Broccoli Extract / Unstandardized Powder

Products labeled "broccoli extract," "broccoli concentrate," or "cruciferous blend" without specifying glucoraphanin content, myrosinase activity, or standardization method. Heat-processed broccoli supplements convert poorly — in one analysis, some products delivered <5% of labeled sulforaphane equivalent. The isothiocyanate you want simply isn't reaching your bloodstream.

How Sulforaphane Works: 6-Mechanism Table

Mechanism	Effect	Evidence Level
Nrf2 / KEAP1 pathway activation	Upregulates 200+ cytoprotective genes including antioxidant response elements (HO-1, NQO1, GSTM1)	⬛⬛⬛⬛⬛ Very Strong
Phase 2 enzyme induction	Accelerates carcinogen detoxification — benzene excretion +61%, acrolein excretion +23% (Egner 2014, n=291 China RCT)	⬛⬛⬛⬛⬛ Very Strong (human RCT)
HDAC inhibition	Reactivates epigenetically silenced tumor suppressor genes; reduces cancer cell proliferation in prostate, breast, colorectal cell lines	⬛⬛⬛⬛⬜ Strong (mostly mechanistic + pilot clinical)
H. pylori suppression	3-day broccoli sprout consumption reduced H. pylori colonization and gastric inflammation markers in infected subjects (Yanaka 2009 RCT, n=48)	⬛⬛⬛⬛⬜ Strong (human RCT)
Heat shock protein induction (HSP70)	May explain behavioral improvements in autism spectrum (fever-benefit hypothesis); proposed mechanism in Singh et al. 2014 RCT	⬛⬛⬛⬜⬜ Moderate (pilot RCT, mechanism plausible)
Metabolic / insulin sensitivity	Reduced fasting blood glucose and HbA1c in obese T2DM patients (Axelsson 2017 RCT, n=97); AMPK activation, hepatic gluconeogenesis reduction	⬛⬛⬛⬜⬜ Moderate (replicated in animal models, 1 human RCT)

Key Clinical Trials

Egner et al. 2014 — Air Pollution Detoxification (n=291)

Cancer Prevention Research

The most cited sulforaphane human trial. 291 participants in Jiangsu, China (high air pollution) randomized to broccoli sprout beverage (~600 μmol glucoraphanin/day) vs. placebo. Urinary excretion of benzene metabolites increased 61% and acrolein metabolites 23% in treatment arm. Demonstrates rapid Phase 2 enzyme induction by glucoraphanin/sulforaphane in humans — with real-world carcinogen detox as the readout.

Singh et al. 2014 — Autism Spectrum Disorder (n=29)

PNAS — Johns Hopkins

29 males with moderate-severe ASD (aged 13–27) received weight-dosed sulforaphane from broccoli sprout extract (50–150 μmol/day) vs. placebo for 18 weeks. ABC (Aberrant Behavior Checklist) improved 34%, SRS (Social Responsiveness Scale) improved 17%, CGI (Clinician Global Impression) improved significantly vs. placebo. Scores reverted to baseline after washout. First controlled evidence that sulforaphane may be clinically relevant in ASD management — proposed mechanism via HSP70 induction.

Yanaka et al. 2009 — H. pylori (n=48)

Cancer Prevention Research

48 H. pylori-infected adults randomized to broccoli sprouts (70 g/day, ~100 μmol sulforaphane) vs. alfalfa sprouts (control) for 8 weeks. H. pylori colonization reduced significantly in broccoli sprout group (measured by 13C-urea breath test); gastric biomarkers (PGE2, HP antigen levels) also improved. After washout, H. pylori levels rebounded — suggesting ongoing consumption required for sustained effect.

Axelsson et al. 2017 — Type 2 Diabetes (n=97)

Science Translational Medicine

97 obese T2D patients received broccoli sprout extract (equivalent to ~600 μmol glucoraphanin/day) vs. placebo for 12 weeks. Fasting blood glucose reduced significantly in treatment arm; HbA1c trended lower. Liver gene expression data suggested reduced hepatic gluconeogenesis via AMPK activation. Effect was strongest in patients with dysregulated glucose — suggesting greatest benefit in the metabolically compromised.

Dosing by Goal

Goal	Target Dose	Form	Duration
General Nrf2 / antioxidant	10–30 μmol/day	Any Tier 1–2	Ongoing
Cancer chemoprotection	30–60 μmol/day	Avmacol, Prostaphane, or fresh sprouts	Daily, ongoing
Air pollution / carcinogen detox	40–80 μmol/day	Glucoraphanin + myrosinase or fresh sprouts	Daily during exposure periods
H. pylori / gut protection	~100 μmol/day	Fresh broccoli sprouts (70 g) or equivalent	8 weeks continuous
Autism spectrum (emerging)	50–150 μmol/day (weight-dosed)	Prostaphane or Avmacol (clinical-grade)	18+ weeks; discontinue if no response
Metabolic / blood sugar	~600 μmol glucoraphanin/day	High-dose glucoraphanin + myrosinase	12 weeks minimum

Note: μmol (micromoles) is the standard unit for sulforaphane dosing in clinical trials. Most supplement labels use mg of glucoraphanin — divide by 427 (MW of glucoraphanin) × 1000 to convert to μmol approximately. Always check the conversion factor the manufacturer provides.

Sulforaphane Longevity Stack

🛡️ Detox + Antioxidant Axis

Sulforaphane (Nrf2 / Phase 2 activation)

Master regulator — activates the enzymes that all other antioxidants depend on

Glutathione (GSH / NAC)

Sulforaphane induces glutathione synthesis via Nrf2 — synergy with direct GSH or NAC supplementation

Alpha-Lipoic Acid

Universal antioxidant; regenerates vitamins C, E, and glutathione — complementary Nrf2 pathway support

Selenium (SeMet / selenate)

Glutathione peroxidase cofactor — sulforaphane-induced GSH requires selenium to function as antioxidant enzyme

🔬 Longevity + Cellular Health

Quercetin

Senolytic + Nrf2 activator; complementary flavonoid pathway; anti-inflammatory synergy

PQQ

Mitochondrial biogenesis via PGC-1α — sulforaphane clears damaged mitochondria; PQQ builds new ones

NMN / NAD+ Precursors

NAD+ supports sirtuin-mediated DNA repair; sulforaphane reduces oxidative burden that depletes NAD+

Curcumin (BCM-95 / CurcuWIN)

NF-κB anti-inflammatory; sulforaphane works via Nrf2 arm — complementary, non-overlapping pathways

Who Benefits Most

✓Smokers and ex-smokers — Phase 2 detox enzymes directly neutralize tobacco carcinogens; benzene and acrolein excretion proven in RCT
✓People with high pollution exposure — air quality detoxification with peer-reviewed human evidence (Egner 2014)
✓Family history of breast, prostate, colorectal cancer — strongest chemoprotective evidence base among natural compounds
✓H. pylori infection — broccoli sprouts shown to reduce colonization and gastric inflammation markers
✓T2DM / insulin resistance — one well-designed RCT showing fasting glucose and HbA1c reduction
✓ASD families (emerging) — behavioral improvement in pilot RCT; ongoing Phase 2 trials

Use with Caution

⚠Thyroid conditions — high-dose raw cruciferous compounds (goitrogens) may inhibit iodine uptake; cooking and spacing from thyroid medication is advisable
⚠Anticoagulant medications (warfarin) — cruciferous vegetables contain vitamin K; consistent consumption preferred over sporadic high doses to avoid INR fluctuation
⚠Chemotherapy patients — Nrf2 activation is cytoprotective in normal cells but may theoretically protect cancer cells against certain chemotherapy agents; discuss with oncologist before use
⚠Immunocompromised individuals — avoid raw sprouts (Listeria, Salmonella contamination risk in commercial sprouts); cooked or supplement form preferred

5 Common Sulforaphane Mistakes

Buying broccoli extract without checking for myrosinase

The single most common error. Without active myrosinase, glucoraphanin doesn't convert to sulforaphane in meaningful amounts. Always verify the product lists myrosinase enzyme (daikon extract, mustard seed powder) or uses a proprietary conversion system like Avmacol/TrueBroc.

Steaming or boiling broccoli until the myrosinase is dead

5+ minutes of steam at 100°C destroys myrosinase. Best cooking method: lightly steam 3–4 minutes, then sprinkle finished broccoli with mustard seed powder to restore enzyme activity. Or eat raw (chew well) and take advantage of intact cellular myrosinase.

Expecting immediate effects

Nrf2 gene upregulation peaks 12–24 hours after dosing and requires consistent daily intake to maintain elevated Phase 2 enzyme expression. Unlike stimulants or nootropics, sulforaphane builds a detoxification infrastructure over days to weeks — not an acute effect.

Overlooking dose — taking 'trace' amounts from greens powders

AG1 and most greens powders contain broccoli extract at 50–200 mg (often without myrosinase), yielding far less sulforaphane equivalent than clinical trial doses. If you're using sulforaphane for a specific outcome, supplement with a dedicated product at therapeutic dose alongside your greens powder.

Conflating cruciferous vegetable consumption with therapeutic supplementation

Eating 1 cup of broccoli delivers ~10–20 μmol sulforaphane equivalent (with myrosinase intact from raw consumption). Clinical trials use 30–150 μmol/day. Whole food consumption is beneficial and should be the foundation — but achieving clinical trial doses from food alone requires 3–5 daily servings of raw cruciferous vegetables or fresh sprouts.

Sulforaphane FAQ

What is the best sulforaphane supplement?

The best sulforaphane supplements pair glucoraphanin (the stable precursor) with active myrosinase enzyme. Avmacol, Prostaphane (Europe), and SGS/TrueBroc-standardized products consistently deliver bioavailable sulforaphane. Broccoli sprout powder without verified myrosinase activity delivers inconsistent results.

What does sulforaphane do?

Sulforaphane activates Nrf2 — the master regulator of cellular defense — upregulating 200+ genes including Phase 2 detoxification enzymes, antioxidant response elements, and anti-inflammatory pathways. Clinical evidence supports cancer chemoprotection, carcinogen detoxification, H. pylori suppression, autism behavior improvements (pilot RCT), and metabolic benefits.

How much sulforaphane should I take per day?

Most clinical benefits emerge at 30–100 μmol/day of bioavailable sulforaphane. General Nrf2 maintenance: 10–30 μmol/day. Cancer chemoprotection: 30–60 μmol/day. Air pollution detox: 40–80 μmol/day. Always check your supplement's glucoraphanin-to-sulforaphane conversion factor.

Is glucoraphanin the same as sulforaphane?

No. Glucoraphanin is the stable glucosinolate precursor; sulforaphane is the bioactive isothiocyanate formed when myrosinase cleaves glucoraphanin. Without myrosinase, glucoraphanin does not convert to sulforaphane in significant amounts. Heat processing destroys myrosinase, which is why most broccoli supplements underperform.

Can I just eat broccoli sprouts instead of a supplement?

Yes — fresh 3–5 day broccoli sprouts are the highest natural sulforaphane source (20–50x the concentration of mature broccoli) and deliver highly bioavailable sulforaphane. Chewing activates myrosinase. 50 g of fresh sprouts delivers ~40–80 μmol sulforaphane. Growing at home is cost-effective and gives you control over seed quality.

Does sulforaphane help with autism?

Promising but preliminary. A 2014 Johns Hopkins RCT (n=29) showed improvements in ABC, SRS, and CGI scores vs. placebo at 50–150 μmol/day, with reversion after washout. A larger Phase 2 trial is ongoing. The scientific community views this as compelling pilot data, not yet a clinical recommendation.

Can sulforaphane prevent cancer?

Sulforaphane has the strongest chemoprotective mechanistic evidence of any food-derived compound. It induces Phase 2 enzymes that neutralize carcinogens before DNA damage, promotes apoptosis in cancer cell lines, and inhibits HDAC to reactivate tumor suppressor genes. Epidemiology strongly correlates cruciferous intake with reduced cancer risk. No large RCT has proven reduced cancer incidence as a primary endpoint — but the mechanistic and epidemiological case is compelling.

What foods have the most sulforaphane?

Broccoli sprouts (3–5 day old) have 20–50x more glucoraphanin than mature broccoli. Other high sources: watercress, garden cress, Brussels sprouts. Cooking kills myrosinase — lightly steam 3–4 minutes max, or eat raw with mustard seed powder to restore enzyme activity.

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Best Sulforaphane SupplementsRanked 2026