Sulforaphane (Crucera-SGS)
Also sold as: Broccoli Sprout Extract, Broccoli Seed Extract, Glucoraphanin
Best-in-class: Crucera-SGS
A stabilized broccoli-seed precursor to sulforaphane, the most potent natural activator of Nrf2 — the master switch for the body's own antioxidant and detox enzymes.
Sulforaphane (Crucera-SGS) quick facts
| Suggested dose | The human H. pylori trials used roughly 70 g of fresh broccoli sprouts daily for 8 weeks. Capsules are sold by glucoraphanin content rather than sulforaphane — read the label for that figure, and take it with food. |
| How often | Daily |
| Who it's for | Detox/antioxidant support and cruciferous-vegetable insurance. |
| Best-in-class brand | Crucera-SGS |
The practical detail decides whether you get anything at all. Broccoli contains glucoraphanin, an inert precursor, and converting it needs the enzyme myrosinase — which is destroyed by cooking. So cooked broccoli, and any supplement providing glucoraphanin without active myrosinase, delivers very little sulforaphane. That pairing is exactly what the stabilized products exist to solve, and it's the single thing to check on a label. The human evidence is strongest for accelerating clearance of airborne pollutants; the broader claims are earlier than they're usually presented.
How Sulforaphane (Crucera-SGS) actually works
Sulforaphane is the most potent natural activator of Nrf2, the transcription factor that governs the body's own antioxidant and phase II detoxification machinery. Normally Nrf2 is held in the cytoplasm by Keap1 and continuously destroyed; sulforaphane modifies Keap1's cysteine residues, releasing Nrf2 to enter the nucleus and switch on glutathione synthesis, glutathione S-transferases and NAD(P)H quinone dehydrogenase. That's an important distinction from a dietary antioxidant: it doesn't neutralize radicals itself, it upregulates the systems that do — so the effect outlasts the dose.
Where to get Sulforaphane (Crucera-SGS)
Buy Crucera-SGS at Thorne →What it is, why it recurs, and where this fits — free to read.
The evidence for Sulforaphane (Crucera-SGS)
Graded by what exists behind each claim.
✅ Clinically validated
- Human studies show upregulated detoxification enzymes and enhanced clearance of airborne pollutants.
- Signals for benefit in oxidative-stress and metabolic markers.
📊 Correlative data
- Higher cruciferous-vegetable intake is associated with lower cancer and cardiovascular risk.
🧪 Theoretical / extrapolated benefits
- Broad anti-cancer, brain and longevity claims from Nrf2 activation are exciting but largely preclinical for hard outcomes.
How to read these tiers: they say how much human evidence exists, not how well something works — and ✗ flags harm, never a disappointing trial. How the evidence tiers work →
What Sulforaphane (Crucera-SGS) actually does
Sulforaphane does not exist in a broccoli plant until the plant is damaged, and it does not exist in most capsules at all. Cruciferous vegetables store glucoraphanin, a stable glucosinolate, in one cellular compartment and the enzyme myrosinase in another. Chewing, chopping or crushing brings them together; myrosinase hydrolyzes the thioglucoside bond and the aglycone rearranges to sulforaphane, an isothiocyanate Connolly 2021.
The molecular target is a cysteine sensor, and the chemistry is unusually specific. The isothiocyanate carbon is electrophilic and reacts with reactive cysteine thiols on KEAP1, the adaptor that normally delivers NRF2 to a ubiquitin ligase for degradation. Modifying those cysteines stops the degradation, so newly synthesized NRF2 accumulates, enters the nucleus and binds antioxidant response elements.
What NRF2 then transcribes is a coordinated phase II program, not an antioxidant. Glutathione S-transferases, NAD(P)H quinone dehydrogenase 1, heme oxygenase-1, glutamate-cysteine ligase and the multidrug resistance-associated proteins. That is the important conceptual point: sulforaphane is not itself an antioxidant of any consequence, it induces the cell's own detoxification and antioxidant machinery, which then persists for days after the compound is gone.
That induction has a documented and unusual clock. Because the effect is transcriptional, the enzyme response outlasts the compound's plasma exposure by a long margin — hours of exposure producing days of raised enzyme activity. It is the reason a molecule with a short half-life can be dosed once daily and still be doing something.
Sulforaphane also does things NRF2 does not explain. It inhibits histone deacetylases, suppresses nuclear factor kappa B signaling, and induces cell cycle arrest in transformed cells. Those are separate mechanisms operating at different concentrations, which is why the cancer literature and the metabolic literature do not predict each other Connolly 2021.
Cell, rodent, human — and where it stops
The surrogate on this page is the amount of sulforaphane that appears in urine, and an entire supplement industry competes on it without anybody having connected it to an outcome.
In cells the chain is complete. KEAP1 modification, NRF2 stabilization and phase II enzyme induction are established and reproducible, and the concentrations required are achievable Connolly 2021.
In humans the conversion step is the whole problem and it has been measured carefully. Bioavailability of sulforaphane from a glucoraphanin-rich broccoli seed extract depends on myrosinase, and adding exogenous myrosinase from mustard seed increases it in a randomized clinical study Mastaloudis 2026. Dynamic gastric digestion models reach the same conclusion Zhu 2024, and a physiologically based model reproduces the kinetics Shekarri 2021.
Without plant myrosinase, the job falls to gut bacteria and they are unreliable. Colonic bacterial thioglucosidases convert some glucoraphanin to sulforaphane, with conversion efficiency varying roughly tenfold between people and falling further after antibiotics. That variability is the reason two people on the same capsule have different exposures, and it is not on any label.
The clinical endpoints, where they exist, are markers. A double-blind, placebo-controlled crossover trial tested sulforaphane as a modifier of calorie-induced inflammation using inflammatory markers as the endpoint van Steenwijk 2023. The trial literature more broadly is small, short and heterogeneous, and the challenges of designing and implementing broccoli sprout trials have been described by the people who ran them Fahey 2021.
The obstacle to transfer is stated most honestly in that methodological paper. Preparations differ in glucoraphanin content, in myrosinase activity, in stability and in what the participants ate alongside, so trials that nominally test the same thing do not Fahey 2021. Turning this evidence into public health action has been difficult for exactly that reason.
Sulforaphane (Crucera-SGS) — which form, and does it matter
Three materials are sold under one name and only one of them reliably delivers sulforaphane. Stabilized sulforaphane itself, which is expensive and degrades; glucoraphanin with active myrosinase co-delivered; and glucoraphanin alone, which depends entirely on the buyer's gut bacteria. The third is the commonest and the least predictable Mastaloudis 2026.
Myrosinase is heat-labile, which makes cooking a form decision. Boiling broccoli inactivates the plant enzyme, so cooked broccoli delivers glucoraphanin to the colon rather than sulforaphane to the small intestine. Adding a small amount of raw crucifer — mustard seed powder, raw rocket, radish — to a cooked dish restores the conversion, which is the same trick the supplement industry now uses in a capsule Zhu 2024.
The pharmacokinetics are fast and the pharmacodynamics are not. Sulforaphane formed in the small intestine is absorbed rapidly, peaking in plasma at roughly 1 to 3 hours; when conversion depends on colonic bacteria the peak is delayed to 6 to 10 hours and is much smaller Shekarri 2021. The plasma half-life is short, on the order of 2 to 3 hours, because sulforaphane is conjugated to glutathione in the enterocyte and hepatocyte and processed down the mercapturic acid pathway to a cysteinylglycine, a cysteine and finally an N-acetylcysteine conjugate, which undergoes renal clearance. Those urinary conjugates are what is actually measured in bioavailability studies.
So the surrogate is a urinary metabolite of a compound that has already been consumed by conjugation. The mercapturic acid pathway that clears sulforaphane is itself partly NRF2-inducible, which means the compound accelerates its own clearance — and means urinary recovery is a measure of exposure and disposal together rather than of target engagement.
What a label should declare and generally does not. Glucoraphanin content, myrosinase activity in enzyme units, and whether stability testing was done on the finished product. A capsule declaring milligrams of broccoli seed extract has declared none of those three Fahey 2021.
What would have to be true, and how you would know it was not
1. Predict the myrosinase-containing product delivers several times the sulforaphane of the same glucoraphanin dose alone. Predict measurably higher urinary sulforaphane metabolite recovery with co-delivered myrosinase Mastaloudis 2026 Zhu 2024. This is the marker the category competes on and it will perform.
2. Predict the enzyme induction outlasts the compound. Predict that phase II enzyme activity stays elevated for a day or more after plasma sulforaphane has cleared, and that once-daily dosing is therefore adequate. That is a specific, testable consequence of a transcriptional mechanism.
3. The prediction that cuts against the product. Predict that no randomized trial links a raised urinary sulforaphane metabolite to a change in a clinical outcome, because the human literature stops at markers van Steenwijk 2023 Fahey 2021. A trial connecting exposure to an outcome would falsify this page's central claim and is the study the field most needs.
4. Predict inflammation markers move only where there is inflammation. Predict hs-CRP unchanged in a healthy adult at 12 weeks, and a measurable change only under a metabolic challenge or in a population with raised baseline inflammation van Steenwijk 2023.
5. Predict the thyroid worry does not materialize at supplement doses. Glucosinolate-derived thiocyanate competes with iodide at the sodium-iodide symporter, which is the goitrogen argument. Predict TSH and free T4 unchanged at 12 weeks in an iodine-sufficient adult, and predict the concern is real only where iodine intake is low Connolly 2021.
What nobody has tested yet
The exposure-to-outcome link has never been made. Every advance in this field has been a bioavailability advance Mastaloudis 2026 Shekarri 2021, and no trial has randomized a high-conversion preparation against a low-conversion one with a clinical endpoint. That is the same structural gap the curcumin page has.
Nobody can predict a person's conversion capacity. Bacterial thioglucosidase activity varies roughly tenfold and there is no clinical test for it Zhu 2024. A stool or breath assay predicting conversion would let a person know whether a glucoraphanin-only product is worth buying.
The dose is unstandardized across the whole literature. The people who ran the broccoli sprout trials have said so explicitly: preparations, doses and delivery vehicles differ so much that pooling is barely meaningful Fahey 2021. A single agreed reference preparation would do more for this field than another trial.
And the GSTM1 question has never been resolved. Roughly half of people lack the glutathione S-transferase M1 gene entirely, which changes how fast sulforaphane is conjugated and cleared. Whether GSTM1-null people get more or less benefit has been argued in both directions and never settled by a stratified trial Connolly 2021.
Sulforaphane (Crucera-SGS) — its own safety story, not its category's
Tolerability is good and the complaints are digestive. Bloating, flatulence and a sulfurous taste or belch, all consistent with an isothiocyanate and a fermentable plant matrix. Doses used in trials have been well tolerated van Steenwijk 2023.
The thyroid concern belongs to glucosinolates generally and to iodine status specifically. Some glucosinolate breakdown products yield thiocyanate, which competes with iodide for uptake at the sodium-iodide symporter. In an iodine-sufficient person eating ordinary amounts this is not clinically relevant; in someone with marginal iodine intake and a high crucifer load it can be Connolly 2021.
Sprouts carry a microbiological risk that the extract does not. Raw sprouts have been implicated in outbreaks of Salmonella and Escherichia coli O157:H7 because the germination conditions that grow the sprout also grow the pathogen. That is a specific reason to prefer a tested extract over home-grown sprouts for anyone immunocompromised, pregnant or elderly.
The interaction profile is theoretical and worth watching. Inducing phase II conjugation enzymes will in principle accelerate clearance of drugs handled by glutathione S-transferases and UDP-glucuronosyltransferases, and inducing the multidrug resistance-associated protein transporters could change drug efflux. No clinical interaction study has been published, which makes this an unquantified rather than an absent risk.
Who should be cautious. Anyone with known thyroid disease and low iodine intake; anyone on a narrow-therapeutic-index drug cleared by conjugation; and anyone pregnant or breastfeeding at supplemental doses, where there are no data. Food amounts of crucifers are a different question and carry none of these concerns Fahey 2021. Nothing here is medical advice or diagnosis, and these statements have not been evaluated by the Food and Drug Administration.
Sources read for this page
- Mastaloudis A. Exogenous myrosinase from mustard seed increases bioavailability of sulforaphane from a glucoraphanin-rich broccoli seed extract in a randomized clinical study. Sci Rep 2026 · PMID 41692762
- Zhu W. Optimization of sulforaphane bioavailability from a glucoraphanin-rich broccoli seed extract in a model of dynamic gastric digestion and absorption by Caco-2 cell monolayers. Food Funct 2024 · PMID 39670818
- Shekarri Q. A Physiological-Based Model for Simulating the Bioavailability and Kinetics of Sulforaphane from Broccoli Products. Foods 2021 · PMID 34829040
- Fahey JW. The Challenges of Designing and Implementing Clinical Trials With Broccoli Sprouts... and Turning Evidence Into Public Health Action. Front Nutr 2021 · PMID 33996874
- Connolly EL. Glucosinolates From Cruciferous Vegetables and Their Potential Role in Chronic Disease: Investigating the Preclinical and Clinical Evidence. Front Pharmacol 2021 · PMID 34764875
- van Steenwijk HP. Sulforaphane as a potential modifier of calorie-induced inflammation: a double-blind, placebo-controlled, crossover trial. Front Nutr 2023 · PMID 38089924
How you would know if it worked
There is no blood test for this one. That is not a criticism — it is a fact about the effect, and it changes how you should judge it.
- What to watch: This is the honest one to say out loud: there is no detoxification read-out you can buy. The human studies measured urinary conjugates of specific airborne pollutants in high-exposure populations — a research assay run on a group, not a test you can order to see whether your own phase-II enzymes went up. Nrf2 activation is real and it is invisible from where you are standing.
- How long before it means anything: There is no symptomatic window, because there is no symptom this reliably changes. Anyone who says they can feel their phase-II enzymes being induced is describing expectation.
- What will fool you: The framing. 'Detox support' invites you to credit anything that improves in the following month to the capsule, and something always improves in a month. If what you want is the compound this concentrates, cruciferous vegetables several times a week deliver the same precursor with the fiber and the rest of the vegetable attached — and that is a change you can verify by looking at your shopping.
Run it one variable at a time. Starting three things in one week means a result you cannot attribute, which is the same as no result.
Sulforaphane (Crucera-SGS) — safety & side effects
- GI upset and gas — it is a cruciferous compound and behaves like one.
- Affects thyroid function — cruciferous glucosinolates are goitrogenic, which matters at supplemental doses in iodine deficiency or thyroid disease.
- May inhibit some CYP enzymes. Avoid high doses in pregnancy. Look for products that supply myrosinase or stabilized sulforaphane — glucoraphanin alone converts poorly.
Not medical advice. If you take prescription medication or have a diagnosed condition, check this against it with a pharmacist or doctor — pharmacists are underused and free.
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Baseline first, then again at 8–12 weeks.
| Marker | What it’s watching for |
|---|---|
| hs-CRP (High-Sensitivity C-Reactive Protein) | The inflammation these are aimed at |
| ApoB (Apolipoprotein B) | Cardiovascular risk, measured properly |
| HbA1c (Hemoglobin A1c) | Glycation over three months |
| Comprehensive Metabolic Panel (CMP) | Liver and kidney baseline |
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Sulforaphane (Crucera-SGS) — frequently asked questions
What is Sulforaphane (Crucera-SGS)?
A stabilized broccoli-seed precursor to sulforaphane, the most potent natural activator of Nrf2 — the master switch for the body's own antioxidant and detox enzymes.
What is the suggested dose of Sulforaphane (Crucera-SGS)?
The human H. pylori trials used roughly 70 g of fresh broccoli sprouts daily for 8 weeks. Capsules are sold by glucoraphanin content rather than sulforaphane — read the label for that figure, and take it with food. This is a general reference for education only — statements have not been evaluated by the FDA and this is not medical advice.
What are the researched benefits of Sulforaphane (Crucera-SGS)?
Human studies show upregulated detoxification enzymes and enhanced clearance of airborne pollutants.
Who is Sulforaphane (Crucera-SGS) for?
Detox/antioxidant support and cruciferous-vegetable insurance.
Where can I buy Sulforaphane (Crucera-SGS)?
Coach Cam sources Sulforaphane (Crucera-SGS) from Thorne, with 10% off auto-applied at checkout — use the buy link on this page.
Sulforaphane (Crucera-SGS) inside a finished plan
One arm of 2 Protocol Blueprints, free to read in full.
What Sulforaphane (Crucera-SGS) is used for
Sulforaphane (Crucera-SGS) appears under 4 goals in the goal router.
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Where this goes next
Sulforaphane (Crucera-SGS) is the estrogen-clearance arm of this plan. The page above is the free breakdown of one compound; the plan it belongs to — the dosing, the order to correct things in, the week-by-week schedule and what to retest — is a lesson inside Skool.