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Sulforaphane

Sulforaphane

What the trials found

Sulforaphane shows biologically plausible but insufficiently established benefits across human outcomes, with the strongest signals limited to autism-related behavior and pollutant detoxification rather than broad wellness effects.

Risk, worst reported severity

  • cholecystitis (hospitalization) severe
  • COPD exacerbation (hospitalization) severe
All 8 events and interactions
Protocol

Dose, timing & forms

How much

The clearest trial protocol used broccoli-sprout extract supplying 50 to 150 micromoles daily for 18 weeks in young men with autism spectrum disorder. That small trial reported improvements on several behavior measures during treatment, but it does not establish a universal dose or a broad benefit for everyone. 1 Product labels often list milligrams of glucoraphanin instead, so milligram-for-milligram comparisons between products can mislead. 2

When and how long

Use it consistently rather than saving it for stressful days or occasional detoxes. The better-known randomized protocol used a daily dose over months, not an acute single-use approach. 1 Taking a product with food is a practical choice if it causes nausea or bowel discomfort, but clinical studies have not established a single best clock time. 1

Forms & standardisation

Look closely at whether a label lists preformed sulforaphane or glucoraphanin, its plant precursor. A glucoraphanin product also needs a reliable conversion strategy, often myrosinase from broccoli seed or mustard seed, because conversion determines how much sulforaphane you actually generate. 2 Broccoli-sprout preparations have the most recognizable human trial history, but formulations differ enough that one product's dose does not automatically translate to another. 1

Adverse events and drug interactions

Safety events

cholecystitis (hospitalization) severe
COPD exacerbation (hospitalization) severe
nausea moderate
withdrawal due to bowel discomfort moderate
transaminase elevation (liver enzymes) moderate
Abdominal pain moderate
bloating mild
diarrhea mild
Buy well

Recommended Sulforaphane products

Real products that dose Sulforaphane where the research does, in a clean formulation, from brands we've audited. We only list ones we'd stand behind.

Chosen for adequate Sulforaphane dosing vs. the studied range, a clean formulation (grade A–C), and independent brand-quality audits. Not sponsored.

In context

What this is and how it works

  • Human trials report signals for autism-related behavior and airborne-pollutant detoxification, but reliable effect sizes are not established. 1
  • Twenty-five papers reviewed here span 62 outcomes, including clinical trials, mechanistic research, and different sulforaphane preparations.
  • Evidence remains narrow and population-specific, with notable findings coming from small studies rather than broad general populations.

Sulforaphane is a plant compound created when you chew, chop, or process cruciferous vegetables, especially broccoli sprouts. The plant stores a precursor called glucoraphanin, then an enzyme helps convert it into sulforaphane when the plant tissue breaks open. 2

Sulforaphane activates Nrf2, a protein that switches on genes involved in antioxidant and chemical-processing defenses. Picture Nrf2 as the manager who unlocks the maintenance closet, sending out the enzymes that handle everyday cellular wear and tear. 2 Human research also shows that broccoli-sprout drinks can increase the body's removal of certain airborne pollutants, which fits this detoxification pathway. 3

Bottom line

Sulforaphane is a reasonable pick for people who want to try a broccoli-sprout compound with a biologically credible mechanism and are comfortable with early, uneven clinical evidence. The most attention-grabbing human findings come from a small, specific population, so do not treat them as proof of broad brain, mood, or wellness benefits. 1 Skip casual self-experimenting if you have ongoing medical issues or are managing medicines, and discuss it with a clinician first.

Frequently asked

Common questions

What does sulforaphane do in the body?

Sulforaphane activates Nrf2, a protein that tells cells to increase production of protective enzymes. Think of it as flipping on a building's smoke-control system before the air gets too dirty. 2

Is sulforaphane the same as eating broccoli?

No. Broccoli contains the precursor glucoraphanin, while chewing or processing the plant can create sulforaphane. Broccoli sprouts often provide more glucoraphanin per gram than mature broccoli, but conversion varies with preparation and product formulation. 2

How long does sulforaphane take to work?

Human studies have generally used daily intake for weeks rather than a one-time dose. In one small randomized trial, participants used a broccoli-sprout extract for 18 weeks, so it is not a supplement to judge after a day or two. 1

Sources

Sources

  1. 1. Sulforaphane treatment of autism spectrum disorder: a double-blind, randomized trial (2014) ↑
  2. 2. The phytochemical sulforaphane: from plant to clinical trials (2016) ↑
  3. 3. Rapid and sustained detoxication of airborne pollutants by broccoli sprout beverage: results of a randomized clinical trial in China (2014) ↑

Generated August 27, 2026

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