Sulforaphane
TL;DR
Potent sulfur compound found in broccoli sprouts
Strongest natural activator of the Nrf2 'detox' pathway
Moderate evidence for metabolic and liver health
Low evidence for cognitive decline; currently being studied for autism
Generally safe; may cause gas/bloating
Cost: ~$25-40/month
Best for: Liver detoxification, metabolic syndrome, long-term cellular health
What it is
Sulforaphane is the reason your parents told you to eat your broccoli. It isn't 'in' the broccoli; it's created when two precursors (glucoraphanin and the enzyme myrosinase) meet when the plant is chewed or chopped.
Sulforaphane is arguably the most potent natural activator of Nrf2. This is the body's 'master switch' for antioxidant and detoxification genes. Instead of being an antioxidant itself, sulforaphane forces your body to produce its own internal antioxidants (like glutathione) more efficiently.
What the research says
Sulforaphane is a metabolic 'cleaner.' Insulin Resistance. A 2017 study in Science Translational Medicine showed that sulforaphane reduced glucose production in the liver and improved HbA1c in obese patients with Type 2 diabetes. It works via different pathways than Metformin, making it a promising 'add-on' therapy.
Brain evidence is early but very promising. Neuroinflammation. By activating Nrf2 in the brain, sulforaphane can reduce the inflammation that drives cognitive decline. Autism. Interestingly, it has shown significant success in improving social scores in young men with autism, suggesting a real, direct effect on brain function.
This is sulforaphane's strongest suit. Detoxification. It has been shown to increase the excretion of airborne pollutants (like benzene) and help the liver process toxins more efficiently. Fatty Liver. Emerging research shows it can reduce liver inflammation and fat accumulation in NAFLD.
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Safety
Generally safe. It is a concentrated version of a vegetable. Expect some 'cruciferous' gas or bloating. It contains goitrogens, so people with severe iodine deficiency or thyroid issues should be careful with extremely high doses.
Interactions
- Thyroid Meds: Theoretical interference with iodine uptake.
- Liver Meds: May speed up the breakdown of various drugs by the liver (Induction of Phase II enzymes).
Dosing
Standard Dose: 10-30 mg of 'Actual Sulforaphane' or 100-500 mg of Broccoli Sprout Extract. Form: MUST contain active myrosinase or be 'stabilized' sulforaphane (Prostaphane). Raw sprout powder without the enzyme is much less effective.
Cost
Expensive. High-quality, stabilized sulforaphane is difficult to manufacture, costing $25-40 per month.
The bottom line
Sulforaphane is the gold standard for 'activating' your body's defenses. It's expensive, but if you want to optimize your detoxification and metabolic pathways, it's worth the price.
Sources for this page include published meta-analyses, systematic reviews, and NIH dietary supplement fact sheets. All claims reflect the evidence as of early 2026.
This is not medical advice. Consult your healthcare provider before starting any supplement, especially if you take medications.