Sulforaphane is one of the easiest supplements to compare incorrectly. I sorted eight popular options by what is actually in the bottle, whether it includes the enzyme needed for conversion, and what you get for the price.
The key problem is simple once someone explains it. Some bottles contain sulforaphane itself. Others contain glucoraphanin, also called sulforaphane glucosinolate or SGS, which your body must convert into sulforaphane. Myrosinase helps that conversion happen. So a big SGS number without myrosinase is not directly comparable with a smaller amount of stabilized sulforaphane.
Avmacol Extra Strength is my top pick because the same named formula appears in a registered human study that describes glucoraphanin plus active myrosinase. Jarrow BroccoMax is the better value: it states 35 mg SGS, names myrosinase, and lists a 60-day supply for $26.54. I would be far more cautious with expensive products that do not state the amount or explain how conversion happens.
The research helps us understand the chemistry, but it does not prove that a retail capsule protects you from illness, improves liver function, or replaces medical care. Human studies have found better sulforaphane exposure when active myrosinase is present. That is why I pay attention to the enzyme on the label. It is not a reason to turn a shopping list into a care plan.
Our Verdict
Nutramax Avmacol Extra Strength
Avmacol Extra Strength is the named formula in a registered human study that describes glucoraphanin plus active myrosinase. It is expensive, so confirm that the current label still matches the formula you expect.
Best for: Shoppers who care more about the named study connection than finding the cheapest bottle
Check Price on AmazonHow I Compared These Sulforaphane Supplements
I first put each product into one of two groups: a precursor that needs conversion or a product that claims to contain stabilized sulforaphane. Then I looked for myrosinase, a stated amount or yield, a clear serving size, and a realistic price. Jarrow and Life Extension name myrosinase. Avmacol Extra Strength has the clearest study connection. Ideal Wellness and BrocElite use stabilized-sulforaphane wording. Nutricost and THORNE leave important questions unanswered in their selected titles.
I did not compare milligrams as if every label described the same substance. Ten milligrams of stabilized sulforaphane is not the same thing as 35 milligrams of SGS. I also did not reward an expensive brand for being expensive. Once the chemistry made sense, I compared the serving count and price.
Sulforaphane Supplements at a Glance
| Product | What the listing says | Recorded price | Best for | |
|---|---|---|---|---|
| Nutramax Avmacol Extra Strength | Sulforaphane-producing supplement; 75 tablets | $65.99 | Shoppers who value the named study formula | Check price |
| Ideal Wellness Stabilized Sulforaphane | 10 mg stabilized sulforaphane; 30 vegan capsules | $33.95 | Preformed-amount comparison | Check price |
| THORNE Broccoli Seed Extract | Broccoli seed extract; SGS; 60 capsules | $67.00 | Seed-extract label to verify | Check price |
| Nutramax Avmacol | Sulforaphane-producing supplement; 60 tablets | $29.99 | Standard-strength Avmacol comparison | Check price |
| Nutricost Sulforaphane Glucosinolate | SGS; 120 capsules | $18.95 | Budget precursor listing | Check price |
| BrocElite Mara Labs Plus | Stabilized broccoli sulforaphane; 60 capsules | $79.95 | Premium stabilized-form comparison | Check price |
| Jarrow Formulas BroccoMax | 35 mg SGS; myrosinase; 120 delayed-release veggie capsules; 60-day supply | $26.54 | Clear precursor-plus-enzyme value | Check price |
| Life Extension Optimized Broccoli | Broccoli with myrosinase; 30 capsules | $24.98 | Short myrosinase-containing comparison | Check price |
Prices and availability can change. Confirm the delivered label, serving size, chemical form, myrosinase details, storage directions, and checkout total. Precursor and stabilized-sulforaphane amounts cannot be compared as if they were the same ingredient.
Our Eight Picks
1. Best Overall: Nutramax Avmacol Extra Strength
Nutramax Avmacol Extra Strength Sulforaphane Producing Supplement, 75 Tabs
Best OverallAvmacol Extra Strength is my top pick because the named formula has useful human-study context. It is expensive, so confirm that the current label still matches.
Pros
- Avmacol Extra Strength is named in a registered human study
- 75-tablet count is stated
- The study formula uses glucoraphanin and active myrosinase
Cons
- Highest recorded price among the Avmacol options
- The title does not state a glucoraphanin or sulforaphane yield
Avmacol Extra Strength takes the top spot because a registered human study names the same formula and describes glucoraphanin with active myrosinase. That is a much stronger starting point than a generic broccoli capsule. It does not prove the bottle will deliver a health result, and the current listing still needs to match the study formula. At $65.99 for 75 tablets, this is a premium choice.
Skip this if: you want the dose shown in the title or need to keep the price down. Jarrow gives you 35 mg SGS, myrosinase, 120 capsules, and a 60-day supply for $26.54. Avmacol is for the shopper who values the named study connection enough to pay more after checking the current label.
2. Best Value: Jarrow Formulas BroccoMax
Jarrow Formulas BroccoMax Sulforaphane Generator 35 mg, Sulforaphane Glucosinolate & Myrosinase, Broccoli Seed Supplement for LiverHealth Support, 120 Delayed Release Veggie Capsules, 60 Day Supply
Best Precursor-plus-Enzyme ValueBroccoMax is the better value if you want SGS plus myrosinase without paying Avmacol prices. Remember that 35 mg of SGS is not 35 mg of sulforaphane.
Pros
- 35 mg SGS and myrosinase are named
- 120 delayed-release veggie capsules and 60-day supply are stated
- Recorded price is far below Avmacol Extra Strength
Cons
- The 35 mg figure is SGS, not a universal preformed-sulforaphane equivalent
- LiverHealth wording is a product claim, not a clinical result
BroccoMax is the product I would point most value-conscious shoppers toward. The listing states 35 mg SGS, names myrosinase, and includes 120 delayed-release capsules for a 60-day supply at $26.54. That is far more useful than a title that only says broccoli extract.
Skip this if: you specifically want stabilized sulforaphane instead of a precursor system. Also confirm the two-capsule serving and directions. BroccoMax ranks well because it tells you how the conversion is supposed to happen, not because 35 mg is a universal target.
3. Best Stabilized Formula with a Stated Amount: Ideal Wellness
10mg Pure Stabilized Sulforaphane Supplement from Broccoli Sprout Extract - Cellular Detox, Liver & Brain Health Support - Nrf2 Activator - Non-GMO & Glyphosate Free - 30 Vegan Capsules
Best Direct Amount to VerifyThis is the clearest direct-sulforaphane option in the group. Before buying, I would still look for current stability and assay details behind that 10 mg claim.
Pros
- 10 mg stabilized sulforaphane is stated
- 30 vegan capsules are stated
- Preformed-amount wording avoids a hidden conversion step on the title
Cons
- Selected title does not show an independent assay or lot result
- Detox, liver, brain, and Nrf2 language does not establish a clinical outcome
Ideal Wellness states 10 mg of stabilized sulforaphane and 30 vegan capsules for $33.95. That is easy to read, but do not compare the 10 mg directly with Jarrow’s 35 mg SGS. They are different forms. The important follow-up is how the company measured and maintained that 10 mg amount.
Skip this if: you want the clearest precursor-plus-myrosinase formula or a longer supply. Jarrow costs less and gives you twice as many days. Ideal Wellness is for someone who specifically wants a stabilized form and is willing to verify the assay and storage details.
4. Best Small Bottle with Myrosinase: Life Extension
Life Extension Optimized Broccoli with Myrosinase, 30 Capsules
Best Short Myrosinase ComparisonLife Extension gives you broccoli plus myrosinase in a small bottle. The missing glucoraphanin or sulforaphane amount is the first thing I would check.
Pros
- Broccoli and myrosinase are named directly
- 30-capsule bottle keeps first purchase small
- Recognizable short-list alternative to precursor-only products
Cons
- Selected title does not state a glucoraphanin or sulforaphane amount
- Short count makes serving math essential
Life Extension names myrosinase and gives you 30 capsules for $24.98. That is useful, but the selected title does not state the glucoraphanin amount or expected sulforaphane yield. It ranks below Jarrow because you have to open the full label to answer those questions.
Skip this if: you want a stated amount or a 60-day supply. Life Extension makes more sense as a smaller first bottle for someone who wants myrosinase included and is willing to check the facts panel.
5. Best Budget SGS Option: Nutricost
Nutricost Sulforaphane Glucosinolate (SGS) 120 Capsules
Best Budget Precursor ListingNutricost is the budget SGS choice, but the title skips both the amount and myrosinase. Check those details before expecting reliable conversion.
Pros
- SGS ingredient family is named
- 120-capsule count is stated
- Lowest recorded price among the basic precursor entries
Cons
- Selected title does not state the amount per serving
- Myrosinase is not named in the selected title
Nutricost is the cheapest precursor product here at $18.95 for 120 capsules. The listing names SGS, but it does not state the amount or mention myrosinase. That missing enzyme detail matters because conversion can vary when the product relies on gut microbes alone.
Skip this if: you want the conversion question answered before checkout. Jarrow names both SGS and myrosinase. Nutricost is only a bargain after the full label confirms the amount, enzyme support, serving size, and storage directions.
6. Best Premium Stabilized Option: BrocElite
BrocElite Mara Labs Plus | Stabilized Broccoli Sulforaphane | 60 Capsules
Best Premium Stabilized ComparisonBrocElite is the premium direct-form option, but $79.95 is hard to justify without a stated amount and current assay details.
Pros
- Stabilized broccoli sulforaphane wording is explicit
- 60-capsule count is stated
- Direct contrast with glucoraphanin-plus-myrosinase products
Cons
- Highest recorded price in the batch
- Selected title does not state an amount or independent assay
BrocElite is the most expensive bottle on this list at $79.95 for 60 capsules. The title says stabilized broccoli sulforaphane but leaves out the amount and any testing details. For that price, I want both. Stability is a real challenge with sulforaphane, but a premium price does not prove the problem has been solved.
Skip this if: you cannot find the amount, assay method, and storage instructions before buying. Jarrow gives you much more information for one-third of the price, and Ideal Wellness at least states 10 mg.
7. Best-Known Brand, but Check the Label: THORNE
THORNE Broccoli Seed Extract, Sulforaphane Glucosinolate (SGS), 60 Capsules
Best Branded Seed-Extract QuestionThorne is a familiar name, but the title does not show the amount or myrosinase. I would not pay $67 until those details are clear.
Pros
- Broccoli seed extract and SGS are named
- 60-capsule count is stated
- Useful premium brand comparison with Jarrow and Avmacol
Cons
- Selected title does not state amount or myrosinase
- Recorded price is high without a visible yield
THORNE lists broccoli seed extract, SGS, and 60 capsules for $67, but the selected title does not show the amount or mention myrosinase. The brand may be familiar, but Jarrow gives you more useful information for much less money.
Skip this if: you want a transparent precursor-plus-enzyme formula. THORNE only makes sense when the full package confirms the SGS amount, enzyme support, directions, and testing details and you still prefer the brand enough to pay the premium.
8. Best Lower-Cost Avmacol: Nutramax Avmacol
Nutramax Avmacol Sulforaphane Producing Supplement for Detox, 60 Tablets
Best Lower-Cost AvmacolThis is the cheaper way into the Avmacol line. Compare the current facts panel with Extra Strength so you know exactly what the lower price changes.
Pros
- Avmacol name and sulforaphane-producing wording are explicit
- 60-tablet count is stated
- Recorded price is less than half of Avmacol Extra Strength
Cons
- The title does not state glucoraphanin, myrosinase, or yield
- Detox wording is a product claim, not a medical outcome
Standard Avmacol costs $29.99 for 60 tablets, less than half the price of Extra Strength. The selected title does not state glucoraphanin, myrosinase, or a yield, so do not assume the two formulas are interchangeable just because they share the Avmacol name.
Skip this if: you want the Extra Strength study connection or the clear 35 mg SGS amount shown by Jarrow. Check the current formula, tablet directions, and enzyme details first. For training nutrition, FitnessVolt’s protein calculator and TDEE calculator are better starting points than a sulforaphane capsule.
Products We Would Not Choose First
We would not start with BrocElite or THORNE from the selected titles alone. BrocElite is the most expensive record without a stated amount or assay, while THORNE names SGS but not myrosinase or a yield. Nutricost is a sensible budget comparison but also needs an enzyme check. Those are not claims that the products fail. They are label standards: the first purchase should tell you what chemical form is present, how much is provided, and how conversion or stability is supported.
Why Myrosinase Changes the Sulforaphane Decision
Broccoli plants store glucoraphanin, a relatively stable glucosinolate precursor. When plant tissue is chewed or processed in a way that preserves the enzyme, myrosinase can convert glucoraphanin into sulforaphane. The conversion can also involve gut microbes, but human responses vary. The 2015 Atwell study reported roughly threefold higher sulforaphane metabolite levels from fresh sprouts than from a myrosinase-inactive extract, and the 2015 Fahey study likewise found three- to fourfold higher bioavailability when active plant myrosinase was present. A 2026 randomized crossover study found that adding mustard-seed myrosinase roughly doubled average bioavailability from a glucoraphanin-rich broccoli seed extract.
That is the practical buying rule: identify one of three things on the label. It may state active myrosinase with glucoraphanin or SGS, a measured sulforaphane yield, or a stabilized preformed sulforaphane amount with a credible assay. If a product only says broccoli, detox, or antioxidant, the conversion question is still unanswered. The absence of a stated enzyme does not prove zero conversion, but it does make the product harder to compare with Jarrow or the Avmacol study pathway.
Human studies can show how much sulforaphane reaches the body and whether certain lab markers move. They still do not tell us that every capsule improves health. The formula, dose, and study goal vary too much. A trial listing tells you what researchers are studying, not that the product has already worked. If you manage cancer, diabetes, a kidney or liver condition, take medicines, or have a procedure coming up, talk with a clinician or pharmacist.
What to Look for Before You Buy Sulforaphane
Do not compare unlike units
Ideal Wellness states 10 mg stabilized sulforaphane. Jarrow states 35 mg sulforaphane glucosinolate and myrosinase. Those numbers describe different forms and should not be ranked as 35 being automatically more or less than 10. A product can also state glucoraphanin in micromoles, a sulforaphane yield, or a proprietary extract amount. Write down the exact unit, chemical form, serving size, and conversion language before calculating cost.
Look for the enzyme or a real yield
Myrosinase is the central label clue for precursor products. Jarrow names it, Life Extension names it, and the Avmacol Extra Strength trial description identifies an active-myrosinase system. Nutricost and THORNE need a closer label read because their selected titles do not name the enzyme. A product that supplies stabilized sulforaphane directly should explain the amount and how it is measured. Without one of those anchors, a big front-label number is incomplete information.
Use capsules, tablets, and servings correctly
Jarrow lists 120 capsules and a 60-day supply, which implies a two-capsule daily format that should be confirmed on the package. Avmacol Extra Strength lists 75 tablets, while standard Avmacol lists 60 tablets. Ideal Wellness lists 30 vegan capsules, and BrocElite lists 60 capsules. Bottle count alone cannot tell you how long a product lasts. Check directions, serving size, storage requirements, and whether delayed-release or softgel language changes use.
Price should follow chemistry
Nutricost’s recorded $18.95 is attractive, but the selected title does not answer the myrosinase question. Jarrow’s $26.54 includes more conversion detail, while Avmacol Extra Strength’s $65.99 buys a named clinical-formula context rather than a certain outcome. BrocElite’s $79.95 is the most expensive and therefore has the highest burden to show amount and assay. Price per capsule is useful only after the form and serving are understood.
Keep food in the comparison
Fresh or lightly processed broccoli sprouts retain native plant enzymes, but food amount, storage, taste, and batch variability are different from capsules. A supplement is not automatically better, and a capsule is not automatically equivalent to a trial preparation. Compare food and products as separate options, then discuss the full plan with a clinician if you have a condition or take medicines. If your stack also includes a broader focus formula, FitnessVolt’s Performance Lab Mind review shows why the complete ingredient panel matters.
Frequently Asked Questions
What is the difference between sulforaphane and glucoraphanin?
Glucoraphanin is a precursor found in broccoli and sprouts. Myrosinase can convert it into sulforaphane, the reactive isothiocyanate studied in human research. A product labeled glucoraphanin or SGS is not the same thing as a product that states preformed sulforaphane. Compare the chemical form, conversion support, serving size, and yield instead of treating all milligrams as identical.
Why does myrosinase matter?
Myrosinase helps release sulforaphane from glucoraphanin. Human studies found higher and more consistent metabolite exposure when active myrosinase was present than when people received precursor alone. It does not guarantee a health outcome, but it is a meaningful label detail. Jarrow names myrosinase, and the Avmacol Extra Strength study description identifies an active-myrosinase system.
Is a stabilized sulforaphane capsule better?
Not automatically. Stabilized wording can avoid the conversion step, but sulforaphane is chemically reactive and the finished product still needs a clear amount, assay, storage instructions, and serving direction. Ideal Wellness and BrocElite use stabilized wording in the selected titles. Compare their current labels with precursor-plus-myrosinase products rather than assuming one category always wins.
Can sulforaphane lower cancer risk or detox the body?
No supplement should be sold as a way to lower cancer risk or detox your body. Human studies have measured sulforaphane in the body and tracked lab markers, but those results do not replace screening, prescribed care, or a clinician’s advice. Words such as detox or health support on a product title are marketing, not a diagnosis or care plan.
How should I choose between Avmacol and BroccoMax?
Start with the exact question you want the label to answer. Avmacol Extra Strength has a named clinical-formula context in an NIH-registered study, but its selected price is high and the title omits a yield. BroccoMax states 35 mg SGS, myrosinase, 120 delayed-release capsules, and a 60-day supply at a lower recorded price. Confirm the current package and serving directions before deciding.
What should I check before buying?
Check the chemical form, amount per serving, serving size, myrosinase or stated yield, capsule or tablet count, storage instructions, all other ingredients, lot and expiration details, and current price. If the label says stabilized sulforaphane, ask how the amount was measured. If it says SGS or glucoraphanin, look for conversion support. When medicines or a health condition are involved, bring the full panel to a pharmacist or clinician.
Bottom Line
Avmacol Extra Strength is my overall pick because the named formula appears in a registered study that describes glucoraphanin plus active myrosinase. Jarrow BroccoMax is the smarter value for most shoppers, with 35 mg SGS, myrosinase, 120 delayed-release capsules, and a 60-day supply for $26.54. Ideal Wellness is the option to investigate if you specifically want stabilized sulforaphane.
Before buying, answer two questions: what form is in the bottle, and how does it become usable sulforaphane? If the company cannot explain the enzyme, the stated yield, or the stabilized amount, a big number and a premium price should not close the sale.
Sources
- Mastaloudis, A., et al. Exogenous myrosinase from mustard seed increases bioavailability of sulforaphane from a glucoraphanin-rich broccoli seed extract in a randomized clinical study. Scientific Reports.
- Atwell, L. L., et al. Absorption and chemopreventive targets of sulforaphane in humans following consumption of broccoli sprouts or a myrosinase-treated broccoli sprout extract. Molecular Nutrition & Food Research.
- Fahey, J. W., et al. Sulforaphane Bioavailability from Glucoraphanin-Rich Broccoli: Control by Active Endogenous Myrosinase.
- Shapiro, T. A., et al. The Challenges of Designing and Implementing Clinical Trials With Broccoli Sprouts and Turning Evidence Into Public Health Action.
- ClinicalTrials.gov. Safety, Feasibility and Efficacy of Sulforaphane (Avmacol Extra Strength) in Chronic Kidney Disease.
- National Institutes of Health Office of Dietary Supplements. Frequently Asked Questions: Dietary Supplements.
