Broccoli (Sulforaphane/Glucoraphanin)

Also known as: Brassica oleracea var. italica, sulforaphane, glucoraphanin, broccoli sprout extract, BSE, isothiocyanate

Evidence under review. — Not yet rated

Broccoli compound with antioxidant and anti-inflammatory potential. Early research is promising but limited.

What it does

Broccoli extract is concentrated around sulforaphane, a compound formed when you chew or process broccoli. Sulforaphane activates a cellular pathway called Nrf2, which helps the body produce its...
Evidence quality

Evidence base hasn't been formally rated yet. See research below.
Clinical dose

No established dose from provided studies

See full breakdown ↓ Methodology →

What the Science Says

Broccoli extract is concentrated around sulforaphane, a compound formed when you chew or process broccoli. Sulforaphane activates a cellular pathway called Nrf2, which helps the body produce its own antioxidant and detoxifying enzymes. Early research suggests it may support healthy inflammation responses, protect cells from oxidative stress, and potentially benefit blood sugar regulation and brain health — but most strong evidence comes from lab and animal studies, not large human trials.

What It Doesn't Do

Not a proven cancer cure or prevention — despite exciting lab results, no human trial has confirmed this. Won't detox your liver overnight. Not a substitute for eating actual vegetables. Supplement doses don't automatically equal the benefits seen in lab studies. No solid proof it builds muscle or burns fat.

Evidence-Based Benefits

Activates the body's own antioxidant pathways by switching on the Nrf2 cellular system.

Weak Evidence

Effective at: No established dose from provided studies

May modestly improve fasting blood sugar and insulin sensitivity in early human studies.

Weak Evidence

Effective at: No established dose from provided studies

May reduce markers of chronic inflammation in preliminary human and animal research.

Weak Evidence

Effective at: No established dose from provided studies

Absorption & Bioavailability

Moderate — sulforaphane from broccoli sprout extracts is generally better absorbed than from raw broccoli, but bioavailability varies widely by product. The enzyme myrosinase is needed to convert glucoraphanin into active sulforaphane; many supplements lack this enzyme, reducing effectiveness. Heat processing can destroy myrosinase.

Red Flags to Watch For

Many broccoli supplements contain glucoraphanin (the precursor) but lack the myrosinase enzyme needed to convert it to active sulforaphane — check labels carefully.
Products claiming to 'detox' or 'prevent cancer' are overstating the evidence significantly — no human RCTs confirm these outcomes.
Standardization varies wildly between brands; sulforaphane content is often not verified by third-party testing.
High-dose sulforaphane supplements may interact with thyroid function in people with hypothyroidism — consult a doctor if relevant.
No regulatory-approved health claims exist for sulforaphane supplements; marketing language is largely unregulated.

Frequently Asked Questions

What does Broccoli (Sulforaphane/Glucoraphanin) do?

Broccoli compound with antioxidant and anti-inflammatory potential. Early research is promising but limited.

What is the effective dose of Broccoli (Sulforaphane/Glucoraphanin)?

No established dose from provided studies

Is Broccoli (Sulforaphane/Glucoraphanin) safe?

Many broccoli supplements contain glucoraphanin (the precursor) but lack the myrosinase enzyme needed to convert it to active sulforaphane — check labels carefully.

What doesn't Broccoli (Sulforaphane/Glucoraphanin) do?

Not a proven cancer cure or prevention — despite exciting lab results, no human trial has confirmed this.

Research Sources

General knowledge — no study abstracts were provided for this analysis. All claims reflect preliminary or traditional-use evidence only.

This information is for educational purposes only and is not medical advice. Always consult a healthcare professional before starting any supplement regimen. Last updated: 2026-05-25