Broccoli
Solid evidence for activates nrf2 antioxidant pathway. Not a miracle worker, but genuinely useful for the right person.
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Verdict
6/10 Promising
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Evidence
Grade B / 100+ Studies
Activates Nrf2 antioxidant pathwayContains sulforaphane (cancer research compound)Supports liver detoxification enzymes
Norans Kepals, Independent Researcher & Supplement Expert
March 1, 2026
The No-BS Summary
8 things. 60 seconds. Everything you need.
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WHAT IT DOES
The king of cruciferous vegetables. Its sulforaphane content activates your body's own detox and antioxidant systems.
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DOES IT WORK?
Broccoli's sulforaphane is one of the most studied phytochemicals in cancer prevention research. It activates Nrf2, your body's master antioxidant switch. As actual broccoli or concentrated broccoli sprout extract, the evidence is quite good. In typical greens blend doses? You're getting a fraction of what studies use. Score reflects concentrated extract potential.
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HOW MUCH TO TAKE
100-500 mg broccoli extract (standardized to sulforaphane/glucoraphanin)
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COST
Budget-friendly. $20-35/month for quality brands.
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FIRST 24 HOURS
Don't expect miracles on day one. It's building in your system.
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AFTER A FEW WEEKS
Most people notice something by week 2-3.
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SAFETY
Few things to check: supplement doses vary wildly in sulforaphane content, myrosinase enzyme needed for conversion (often destroyed in processing). Worth mentioning to your doc.
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HOW IT FEELS
Effects vary person to person. Give it time.
2The Breakdown
Quick Answers
Dose-Response Curve
How effective is broccoli at different doses? Here's what the research shows.
Effectiveness %
0
25
50
75
100
MIN 100mg
SWEET SPOT 400mg
PLATEAU 1.0g
Dose (mg)
0-27%
Sub-therapeutic
<100mg
27-81%
Effective
100mg-400mg
~81%
Optimal
400mg
81%
Diminishing
>1.0g
Moderate confidenceBased on clinical data + estimates
Source: Fahey et al., 2017; Shapiro et al., 2006Bottom line: Most research uses 400mg daily. Below 100mg, you're probably wasting money. Above 1.0g, you're not getting extra benefit.
Dosing Guide
When
As directed
How
100-500 mg broccoli extract (standardized to sulforaphane/glucoraphanin)
Food
With or without food
Onset & Feel
Builds Over Time
Effects vary
Effects vary person to person. Give it time.
Cycle
As needed
How to Take It
Broccoli comes in several formats. Pick what fits your lifestyle.
Capsules/Tablets
Pre-measured doses, easy to take.
✓ Convenient✓ No taste✓ Portable✗ More expensive✗ May need multiple
Powder
Mix with water or a shake.
✓ Cheapest✓ Flexible dosing✗ Needs mixing✗ Taste varies
Softgels
Oil-based for fat-soluble nutrients.
✓ Better absorption for fats✓ No taste✗ Larger pills
Pick this:
Capsules for convenience, powder for value.
Skip this:
Check for unnecessary fillers and additives.
Delivery affects convenience and cost, not usually effectiveness.
Did you know?
Many studies and counting.
Heads Up
Generally safe at recommended doses. Talk to your doc if you have concerns. Check with your doc if: Supplement doses vary wildly in sulforaphane content, Myrosinase enzyme needed for conversion (often destroyed in processing).
3Deep Dive
The Science, Simplified
For those who want the full picture
Broccoli has emerging evidence.
Trust Signals
Grade B
Evidence
50+
Studies
30
Human Trials
0
Meta-analyses
👍 Strong evidence. Most claims hold up under scrutiny.
Mechanism of Action
Glucoraphanin in broccoli converts to sulforaphane via myrosinase enzyme. Sulforaphane activates the Nrf2 pathway, upregulating over 200 cytoprotective genes including glutathione synthesis, Phase II detox enzymes, and anti-inflammatory mediators.
Research Summary
Scientific consensus: undefined/10.
Consensus: /10STRONG Evidence
Origins & Manufacturing
Where does broccoli come from? Let's get nerdy.
How It's Made
Manufacturing process varies by supplier.
What to Look For
✓ Third-party tested✓ GMP certified
Drug & Supplement Interactions
4For You
Is Broccoli right for YOU?
Get a personalized verdict based on your health profile.
Products with Broccoli
Supplements that contain this ingredient
Medical Disclaimer
This content is for informational purposes only and is not intended as medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any supplement regimen, especially if you have medical conditions or take medications. ARE Supplements does not endorse any specific products.