Nucleo Longevity
it

Sulforaphane

sulforaphane · broccoli sprout extract · glucoraphanin

A broccoli-sprout compound that switches on the body's own antioxidant defences.

TypeSupplement / dietary

The grade answers: What does the human evidence support for: Antioxidant defence / detoxification?

Grade

C

Limited

The grade rates evidence quality — it is not advice to take or buy.

Class
Nrf2 activator
Primary use
Antioxidant defence / detoxification
Evidence strength
low
Last reviewed
2026-07-01

Bottom line

A genuinely interesting Nrf2 activator with small human trials on specific outcomes — but longevity claims are extrapolation, and supplement potency is notoriously inconsistent.

What the evidence says

Sulforaphane activates Nrf2, the master switch for the cell's endogenous antioxidant and detoxification genes — a more sophisticated idea than simply swallowing an antioxidant. Small human trials suggest effects on specific outcomes (for example airway inflammation, some metabolic and autism-spectrum measures), but these are early and heterogeneous, and there are no aging-outcome trials. A practical snag: sulforaphane is generated from glucoraphanin by the enzyme myrosinase, and supplement bioavailability/potency varies enormously between products. Grade C: elegant mechanism, immature and inconsistent human evidence.

Key studies

  1. [1]

    Sulforaphane / broccoli sprout extract clinical trials · RCT

    Small trials on specific outcomes; not longevity.

    Open on PubMed ↗
  2. [2]

    Sulforaphane and Nrf2 signalling (review) · review

    Explains the endogenous-defence mechanism.

    Open on PubMed ↗
  3. [3]

    Sulforaphane bioavailability from supplements · pharmacokinetic

    Product potency varies dramatically.

    Open on PubMed ↗
See all studies on PubMed ↗

Mechanism

Activates the Nrf2/ARE pathway, upregulating endogenous antioxidant and phase-II detoxification enzymes; formed from glucoraphanin via myrosinase (from raw sprouts or added to extracts).

Safety

Well tolerated as a food and in trials; high-dose extracts can cause GI upset. Cruciferous intake is broadly healthy; concentrated products are less characterised long-term.

Dosage context

Broccoli-sprout preparations vary widely in actual sulforaphane yield; 'active myrosinase' and standardised sulforaphane content matter more than the headline glucoraphanin number.

Examples of application

  • Obtained from broccoli sprouts or a myrosinase-active extract.
  • Product potency varies a lot — the actual yield matters.
  • An Nrf2 activator idea; human trials are small and specific.

From the field

Sulforaphane is a smarter kind of antioxidant idea — turning on your own defences rather than dosing a molecule. We grade it C: promising mechanism, small trials, and a supplement market where the label rarely matches the dose.

Related molecules

QuercetinCCurcuminC
How we assign grades → Method