Our read is that sulforaphane intake is well supported for its potential benefits, though notable concerns exist regarding its safety and efficacy.
✓WELLSUPPORTED
⚠
High-risk intervention — consult a physician before acting.Drug-drug interactions, dose-dependence, and screening contraindications apply.
Consensus
87%
broad agreement
Evidence quality
50/100
limited
Risk
High
specialist only
Cost / month
$
estimated
Effort
Low
time & habit
Abstract
Our read is that sulforaphane intake can enhance phase two liver detoxification processes and activate antioxidant and anti-inflammatory systems, with some experts suggesting lower doses may be sufficient.
However, other experts contend that sulforaphane may be directly harmful, act as a goitrogen, and inhibit thyroid function, leading to a lack of consensus on its net benefit.
The bioavailability of sulforaphane can vary significantly due to individual gut bacteria differences, and supplements lacking myrosinase may be ineffective.
Method
To increase sulforaphane levels, adding one gram of mustard seed powder to cooked broccoli can increase sulforaphane levels by fourfold. Lower doses of sulforaphane (1.1-7.2 mg) may be sufficient and are attainable through raw broccoli or cruciferous vegetables. Watercress is a cruciferous vegetable that contains sulforaphane.
Evidence detail
01Rhonda Patrick states that sulforaphane activates antioxidant and anti-inflammatory systems.
02Andrew Huberman and Rhonda Patrick note that sulforaphane intake can enhance phase two liver detoxification processes.
03Rhonda Patrick reports that sulforaphane extended lifespan in red flour beetles, particularly under oxidative stress.
04Rhonda Patrick indicates that sulforaphane supplementation prevented bladder cancer development or reduced tumor size in a rat study.
05
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Bryan Johnson and Rhonda Patrick found that broccoli sprout powder containing ~40mg sulforaphane reduced TNF-alpha by 11% and C-reactive protein by 16% in people with type 2 diabetes.
06Rhonda Patrick suggests that omega-3 fatty acids and sulforaphane have strong evidence for reducing systemic inflammation and can complement lifestyle interventions.
07Andrew Huberman and Rhonda Patrick mention that lower doses of sulforaphane (1.1-7.2 mg) may be sufficient for benefits and are attainable through raw broccoli or cruciferous vegetables.
08Rhonda Patrick observed that three months of continuous sulforaphane ingestion from broccoli sprouts showed no negative effects on thyroid function in a 2019 study.
09Andrew Huberman, Bryan Johnson, and Rhonda Patrick state that adding one gram of mustard seed powder to cooked broccoli can increase sulforaphane levels by fourfold.
10Rhonda Patrick found that consumption of broccoli sprout extract containing 37mg of sulforaphane led to detectable accumulation of sulforaphane in human breast tissue within one hour.
11Rhonda Patrick notes that sulforaphane shows early promise for treating depression and neurodegenerative diseases in animal research.
Caveats
Paul Saladino repeatedly asserts that sulforaphane may scavenge iodine and act as a goitrogen, with toxic effects, and is directly toxic to the thyroid gland, inhibiting iodine uptake and thyroid hormone production. He also states that sulforaphane is a toxin that is directly harmful and not beneficial, despite activating Nrf2 and glutathione production. Paul Saladino and Rhonda Patrick both suggest that sulforaphane is not considered net beneficial and may be net toxic. Paul Saladino warns that consuming excessive amounts of plant compounds like sulforaphane can be detrimental and that xeno-hormetic compounds like isothiocyanates can cause collateral damage, including inhibiting thyroid hormone production and causing lipid peroxidation. Rhonda Patrick notes that sulforaphane supplements lacking myrosinase may be ineffective and that there is no scientific consensus that sulforaphane is a cancer therapy. Paul Saladino also mentions that sulforaphane can induce the formation of 4-hydroxy-nonenal (4-HNE), a potentially inflammatory oxidized lipid, and that plant molecules like sulforaphane can be pro-oxidants with collateral damaging side effects.
What would change this verdict
A scientific consensus on sulforaphane's net benefit and long-term safety, particularly concerning thyroid function and potential toxicity, would change the verdict. Further research clarifying optimal dosing, bioavailability across individuals, and the efficacy of supplements with and without myrosinase would also be impactful.