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Sulforaphane
A broccoli-derived compound that activates the Nrf2 antioxidant pathway - the body's master regulator of cellular defence - reducing neuroinflammation, supporting detoxification, and protecting against neurodegenerative disease.
Benefits
What is Sulforaphane?
Sulforaphane is an isothiocyanate compound produced when the enzyme myrosinase converts glucoraphanin (a glucosinolate found in cruciferous vegetables, particularly broccoli sprouts) during chewing, chopping, or digestion. It is one of the most potent naturally occurring activators of the Nrf2 (nuclear factor erythroid 2-related factor 2) pathway - a transcription factor that controls the expression of over 200 cytoprotective genes involved in antioxidant defence, detoxification, anti-inflammation, and cellular repair.
Sulforaphane's relevance to brain health is profound. Neuroinflammation and oxidative stress are transdiagnostic features of virtually all neurodegenerative and neuropsychiatric conditions - Alzheimer's, Parkinson's, depression, schizophrenia, and autism. By activating Nrf2, sulforaphane upregulates endogenous antioxidant enzymes (glutathione S-transferase, NAD(P)H quinone oxidoreductase, heme oxygenase-1) and simultaneously suppresses NF-kB-driven inflammatory cascades. A 2014 clinical trial published in Proceedings of the National Academy of Sciences found that sulforaphane from broccoli sprout extract significantly improved behavioural symptoms in young men with autism spectrum disorder. A 2019 study in Molecular Nutrition and Food Research demonstrated that sulforaphane crossed the blood-brain barrier and reduced neuroinflammatory markers in a human model. Broccoli sprouts contain 10-100 times more glucoraphanin than mature broccoli.
- Nrf2 pathway activation: The most potent natural Nrf2 activator known. Induces expression of over 200 cytoprotective genes within hours of administration
- Glutathione upregulation: Increases synthesis of glutathione - the brain's master antioxidant - by inducing gamma-glutamylcysteine synthetase and glutathione reductase
- NF-kB suppression: Inhibits the NF-kB inflammatory pathway, reducing production of pro-inflammatory cytokines, iNOS, and COX-2 in microglial cells
- Phase II detoxification: Upregulates phase II detoxification enzymes that neutralise environmental toxins, heavy metals, and carcinogens
- Blood-brain barrier penetration: Confirmed to cross the BBB and exert direct effects on brain tissue
- Epigenetic modulation: Acts as a histone deacetylase (HDAC) inhibitor, influencing gene expression patterns associated with neuroprotection and anti-inflammation
- From broccoli sprouts: 50-100 g of fresh broccoli sprouts daily (providing approximately 40-80 mg of sulforaphane after myrosinase conversion)
- Supplement dosage: 10-40 mg of sulforaphane per day from standardised extracts
- Glucoraphanin + myrosinase: Many supplements provide glucoraphanin with added myrosinase enzyme for conversion to active sulforaphane in the gut
- Timing: Best taken with food. Morning dosing may be preferred to avoid potential mild stimulation
- Bioavailability tip: If eating cooked broccoli, add a source of myrosinase (mustard seed powder, raw radish, or raw broccoli sprouts) to restore sulforaphane conversion destroyed by heat
- Onset: Nrf2 gene induction occurs within 1-3 hours. Clinical benefits develop over weeks of consistent intake
- Very safe: Sulforaphane from cruciferous vegetables has an extensive history of safe dietary consumption
- Mild GI effects: May cause gas, bloating, or mild GI discomfort at higher supplement doses, consistent with cruciferous vegetable consumption
- Thyroid: High intakes of cruciferous vegetables may affect thyroid function in iodine-deficient individuals (goitrogenic effect). Ensure adequate iodine intake
- Drug interactions: Sulforaphane induces phase II enzymes and may affect the metabolism of certain medications. Consult your doctor if taking medications with narrow therapeutic windows
- Pregnancy: Dietary amounts of cruciferous vegetables are safe. High-dose supplements lack safety data in pregnancy
Natural Sources & Forms
- Broccoli sprouts: The richest natural source, easily grown at home in 3-5 days from broccoli sprouting seeds
- Stabilised sulforaphane supplements: Products like Prostaphane and BroccoMax provide active sulforaphane or glucoraphanin + myrosinase
- Freeze-dried broccoli sprout capsules: Available from health food suppliers
- Cruciferous vegetables: Broccoli, Brussels sprouts, kale, cabbage, cauliflower - raw or lightly steamed preserves more glucoraphanin
Research Studies
Frequently Asked Questions
A broccoli-derived compound that activates the Nrf2 antioxidant pathway - the body's master regulator of cellular defence - reducing neuroinflammation, supporting detoxification, and protecting against neurodegenerative disease.
The key benefits of Sulforaphane include: Cognitive Enhancement, Energy, Longevity, Memory, Mood, Stress Relief.
Nrf2 pathway activation: The most potent natural Nrf2 activator known. Induces expression of over 200 cytoprotective genes within hours of administration Glutathione upregulation: Increases synthesis of glutathione - the brain's master antioxidant - by inducing gamma-glutamylcysteine synthetase and glutathione reductase NF-kB suppression: Inhibits the NF-kB inflammatory pathway, reducing production of pro-inflammatory cytokines, iNOS, and COX-2 in microglial cells Phase II detoxification: Upregulates phase II detoxification enzymes that neutralise environmental toxins, heavy metals, and carcinogens Blood-brain barrier penetration: Confirmed to cross the BBB and exert direct effects on brain tissue Epigenetic modulation: Acts as a histone deacetylase (HDAC) inhibitor, influencing gene expression patterns associated with neuroprotection and anti-inflammation
From broccoli sprouts: 50-100 g of fresh broccoli sprouts daily (providing approximately 40-80 mg of sulforaphane after myrosinase conversion) Supplement dosage: 10-40 mg of sulforaphane per day from standardised extracts Glucoraphanin + myrosinase: Many supplements provide glucoraphanin with added myrosinase enzyme for conversion to active sulforaphane in the gut Timing: Best taken with food. Morning dosing may be preferred to avoid potential mild stimulation Bioavailability tip: If eating cooked broccoli, add a source of myrosinase (mustard seed powder, raw radish, or raw broccoli sprouts) to restore sulforaphane conversion destroyed by heat Onset: Nrf2 gene induction occurs within 1-3 hours. Clinical benefits develop over weeks of consistent intake
Very safe: Sulforaphane from cruciferous vegetables has an extensive history of safe dietary consumption Mild GI effects: May cause gas, bloating, or mild GI discomfort at higher supplement doses, consistent with cruciferous vegetable consumption Thyroid: High intakes of cruciferous vegetables may affect thyroid function in iodine-deficient individuals (goitrogenic effect). Ensure adequate iodine intake Drug interactions: Sulforaphane induces phase II enzymes and may affect the metabolism of certain medications. Consult your doctor if taking medications with narrow therapeutic windows Pregnancy: Dietary amounts of cruciferous vegetables are safe. High-dose supplements lack safety data in pregnancy
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