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Brussels Sprout Powder

Brassica oleracea var. gemmifera
Evidence Level
Limited
2 Clinical Trials
5 Documented Benefits
2/5 Evidence Score

Brussels sprout powder is produced from freeze-dried or low-temperature-dried Brussels sprouts and concentrates the cruciferous vegetable's signature phytochemicals, including glucosinolates (notably glucobrassicin and glucoraphanin), kaempferol, and vitamin C. When the powder is consumed, plant myrosinase and gut microbiota convert glucosinolates into bioactive isothiocyanates and indoles such as indole-3-carbinol (I3C) and 3,3′-diindolylmethane (DIM), which can activate Nrf2-driven detoxification enzymes and shift estrogen metabolism. Myrosinase is destroyed by heat, so a blanched or warm-dried powder may carry little or none, leaving the conversion to gut bacteria, which varies widely between people and generally yields less. Labels rarely say whether any myrosinase activity survives. Brussels sprout powder is used as a whole-food approach to supply cruciferous phytochemicals in formulations targeting antioxidant defense, detoxification, and hormonal balance. The human research showing measurable effects used about 300 grams of cooked Brussels sprouts a day, roughly a large dinner portion; the one randomised trial that used dried cruciferous powder in capsules at around 3 grams a day, the range a supplement serving supplies, found no effect on the hormone marker it measured.

Studied Dose Human trials of the vegetable used 40 to 300 g/day of Brussels sprouts for one to eight weeks. The 300-400 mg/day I3C figure comes from trials of purified indole-3-carbinol, not from sprouts; a typical 1-5 g/day powder serving supplies at most a few milligrams of I3C, on the order of a hundred times less than the tested dose.
Active Compound Glucosinolates (glucobrassicin, glucoraphanin, sinigrin) yielding indole-3-carbinol, 3,3'-diindolylmethane, and sulforaphane; plus kaempferol, quercetin glycosides, and vitamin C.

Benefits

Supports Phase II detoxification

In small human studies, eating about 300 grams of cooked Brussels sprouts a day raised glutathione S-transferase levels, by about 40 percent in blood plasma after three weeks and by about 30 percent in rectal tissue after one week. In a 2023 trial, 50 grams a day for a week cut how much of the pollutant benzo[a]pyrene reached the blood by more than half. These are enzyme and exposure markers measured in small groups, mostly five to ten people, not health outcomes, and no study has tested whether a 1 to 5 gram powder serving does the same.

Supported by Trial 1, Trial 2

Estrogen metabolism, unchanged by sprouts in a trial

Purified indole-3-carbinol at 6 to 7 mg per kilogram of body weight a day, roughly 400 to 500 mg for an adult, shifted urinary estrogen metabolites toward the 2-hydroxy pathway in two small before-and-after studies of 17 people in total. Brussels sprouts themselves have since been tested: a randomised trial in 78 premenopausal women, using either capsules of dried Brussels sprouts and kale at about 3 grams a day or 40 grams a day of broccoli or Brussels sprouts for eight weeks, found no change in the 2-hydroxyestrone to 16-hydroxyestrone ratio. A 2011 review also found that ratio did not predict breast cancer risk in prospective studies.

Supported by Trial 1

Provides antioxidant nutrients

Supplies kaempferol and vitamin C. Small human trials measured oxidative DNA damage in people eating about 300 grams of cooked Brussels sprouts a day. Urinary 8-oxo-deoxyguanosine fell about 28 percent over three weeks in five men, a one-week crossover found a drop in four of five men but no change at all in the five women, and a 2008 trial in eight people found lymphocytes better protected against DNA damage afterwards. That is damage-marker work in handfuls of people, at a food portion far larger than a powder serving.

Supported by Trial 1, Trial 2

Part of a vegetable-rich eating pattern

Observational studies link diets higher in cruciferous vegetables with better vascular measures, but that research followed people eating whole vegetables and cannot show cause and effect. When Brussels sprouts were actually tested, 300 grams a day for three weeks did not raise HDL cholesterol or apolipoprotein A-I in healthy young men, and no trial has tested the powder for any heart or blood vessel outcome.

Supported by Trial 1, Trial 2

Convenient whole-food cruciferous source

Lets you add cruciferous phytochemicals without preparing fresh sprouts, and fits easily into greens powders and detox-support stacks. A 1 to 5 gram serving is the dried equivalent of well under one standard portion of fresh sprouts, so it adds to a diet rather than replacing the vegetable.

Supported by Trial 1, Trial 2

Mechanism of action

1

Nrf2 pathway activation

Sulforaphane and related isothiocyanates modify cysteine residues on Keap1, releasing Nrf2 to translocate to the nucleus and drive transcription of antioxidant-response-element genes.

2

I3C/DIM estrogen modulation

I3C condenses to DIM in the stomach; both compounds upregulate CYP1A1-mediated 2-hydroxylation of estradiol, shifting the balance toward 2-hydroxyestrone over 16α-hydroxyestrone. That was shown with purified I3C at doses far above anything sprouts supply, and a randomised trial of dried Brussels sprout capsules and of whole crucifers found no change in that ratio.

3

Glutathione conjugation support

Isothiocyanates serve as substrates for glutathione conjugation and induce expression of GST enzymes, helping the body neutralize electrophilic compounds.

4

Kaempferol anti-inflammatory signaling

In cell and animal studies kaempferol modulates NF-κB and MAPK pathways and inhibits select pro-inflammatory enzymes. The human trials of Brussels sprouts measured detoxification enzymes and DNA damage markers, not inflammation.

Clinical trials

1
Indole-3-carbinol and estrogen metabolism

Two small uncontrolled before-and-after studies of purified oral indole-3-carbinol, 6 to 7 mg per kilogram per day. No Brussels sprouts were given.

Seven healthy men for 1 week and ten healthy women for 2 months, 17 people in total

Oral I3C administration significantly increased urinary excretion of C-2 estrogens (such as 2-hydroxyestrone) while reducing concentrations of estradiol and estrone, shifting estrogen metabolism toward the 2-hydroxylation pathway. The material tested was a purified compound rather than Brussels sprouts, there was no placebo group, and the outcome was a urinary metabolite profile rather than a health outcome.

2
Sulforaphane from broccoli sprouts and detoxification

Randomized, placebo-controlled trial of broccoli sprout beverage delivering glucoraphanin and sulforaphane for 12 weeks

n=291 adults in air-polluted region of China

Daily broccoli sprout beverage produced rapid and sustained increases in urinary excretion of benzene (~61%) and acrolein (~23%) conjugates, indicating activation of detoxification pathways. Crotonaldehyde conjugates did not change. This trial used a broccoli sprout beverage, a different vegetable whose glucosinolates are dominated by glucoraphanin, while Brussels sprouts are relatively richer in sinigrin and glucobrassicin. It is not a test of Brussels sprouts or of Brussels sprout powder.

Side effects and drug interactions

Common Potential side effects

Increased intestinal gas and bloating from fermentable fiber and sulfur compounds.
May contribute to a strong urinary or stool odor from sulfur metabolism.
Goitrogenic compounds may modestly affect thyroid function at very high regular intakes.
High in vitamin K, roughly 140 to 180 micrograms per 100 grams of sprouts, so the amount a powder contributes matters to anyone on warfarin.
Possible allergic reaction in individuals sensitive to brassica vegetables.

Important Drug interactions

Warfarin and other vitamin K antagonists: two effects, not one. Brussels sprouts are high in vitamin K, and in ten healthy adults 400 g a day for two weeks also sped warfarin clearance by about 27 percent and cut blood levels of the drug by about 16 percent. Keep intake steady and tell the clinician managing your INR.
Levothyroxine: large goitrogen loads may modestly affect thyroid hormone needs.
CYP1A2 substrates (e.g., theophylline, clozapine): I3C/DIM may induce CYP1A2 and alter clearance.
Tamoxifen and hormone therapies: theoretical interaction via estrogen metabolism shifts.

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Frequently asked questions about Brussels Sprout Powder

What is Brussels sprout extract used for?

Brussels sprout is a cruciferous vegetable, and its extract is used as a source of glucosinolates, mainly sinigrin, progoitrin and glucobrassicin, which the body can convert into isothiocyanates and indoles. Brussels sprouts carry less glucoraphanin, the sulforaphane precursor, than broccoli sprouts do, so they are not interchangeable with a broccoli sprout product.

What is Brussels sprout good for?

Like other cruciferous vegetables, it provides glucosinolates that the body converts into sulforaphane and indoles (like I3C and DIM), which have been studied mainly for detoxification enzyme activity. The trials that found effects fed 50 to 300 grams of the whole vegetable a day, so eating the vegetable is the best-supported form.

How much Brussels sprout extract should I take?

Extracts are dosed for their glucosinolate or sulforaphane-precursor content; follow product labeling. Eating cruciferous vegetables regularly is a food-first approach.

Is Brussels sprout safe?

As a food it is very safe and nutritious. Concentrated cruciferous extracts are generally well tolerated; those with thyroid concerns should note cruciferous vegetables contain goitrogens (an issue mainly with very high raw intake). It is high in vitamin K, relevant for warfarin users.

What is Brussels Sprout Powder?

Brussels sprout powder is produced from freeze-dried or low-temperature-dried Brussels sprouts and concentrates the cruciferous vegetable's signature phytochemicals, including glucosinolates (notably glucobrassicin and glucoraphanin), kaempferol, and vitamin C.

What is Brussels Sprout Powder used for?

Brussels Sprout Powder is researched primarily for Antioxidant and Detox & Cleanse. In small human studies, eating about 300 grams of cooked Brussels sprouts a day raised glutathione S-transferase levels, by about 40 percent in blood plasma after three weeks and by about 30 percent in rectal tissue after one week.

What is the recommended dosage of Brussels Sprout Powder?

The clinically studied dose is Human trials of the vegetable used 40 to 300 g/day of Brussels sprouts for one to eight weeks. The 300-400 mg/day I3C figure comes from trials of purified indole-3-carbinol, not from sprouts; a typical 1-5 g/day powder serving supplies at most a few milligrams… Always follow the product label and check with a healthcare provider for personal advice.

Is Brussels Sprout Powder safe, and does it have side effects?

For most healthy adults, Brussels Sprout Powder is well tolerated at studied doses. Reported effects can include: Increased intestinal gas and bloating from fermentable fiber and sulfur compounds. May contribute to a strong urinary or stool odor from sulfur metabolism. It may also interact with some medications. Brussels Sprout Powder is not right for everyone, so check with a healthcare provider first if you are pregnant or breastfeeding, have a medical condition, or take prescription medication.

Does Brussels Sprout Powder interact with any medications?

Possible interactions include: Warfarin and other vitamin K antagonists: two effects, not one. Brussels sprouts are high in vitamin K, and in ten healthy adults 400 g a day for two weeks also sped warfarin clearance by about 27 percent and cut blood levels of the drug by about 16 percent. If you take prescription medication, check with a pharmacist or doctor before using it.

How strong is the scientific evidence for Brussels Sprout Powder?

NutraSmarts rates the evidence for Brussels Sprout Powder as Limited (2 out of 5). It is backed by 2 clinical trials and 13 cited references summarized on this page. A higher rating reflects more, larger, and better-designed human studies.

References(13 citations)

Evidence ratings on NutraSmarts are based on the totality of human clinical research, with emphasis on randomized controlled trials, meta-analyses, and systematic reviews. The references below directly support claims made throughout this page.

  1. Michnovicz JJ, Adlercreutz H, Bradlow HL. Changes in levels of urinary estrogen metabolites after oral indole-3-carbinol treatment in humans. J Natl Cancer Inst. 1997;89(10):718-23. doi: 10.1093/jnci/89.10.718.PubMedUsed to support: Two small before-and-after studies, seven men for one week and ten women for two months, in which purified oral indole-3-carbinol at 6 to 7 mg per kilogram a day, roughly 400 to 500 mg for an adult, raised urinary 2-hydroxylated estrogens and lowered estradiol and estrone. What was tested was a purified compound taken by mouth, not Brussels sprouts and not a powder. A 1 to 5 gram powder serving supplies at most a few milligrams of I3C, on the order of a hundred times less than that dose, and the outcome was a urinary metabolite ratio whose link to health outcomes has not held up in prospective studies.
  2. Egner PA, Chen JG, Zarth AT, Ng DK, Wang JB, Kensler KH, Jacobson LP, Muñoz A, Johnson JL, Groopman JD, Fahey JD, Talalay P, Zhu J, Chen TY, Qian GS, Carmella SG, Hecht SS, Kensler TW. Rapid and Sustainable Detoxication of Airborne Pollutants by Broccoli Sprout Beverage: Results of a Randomized Clinical Trial in China. Cancer Prev Res (Phila). 2014;7(8):813-823. doi: 10.1158/1940-6207.CAPR-14-0103.PubMedUsed to support: 12-week randomised trial in 291 adults in Qidong, China, of a broccoli sprout beverage supplying 600 micromol glucoraphanin and 40 micromol sulforaphane a day, which raised urinary conjugates of benzene by 61 percent and acrolein by 23 percent but not crotonaldehyde. The species tested was broccoli, given as a sprout beverage; Brussels sprouts have a different glucosinolate profile. Treat this as background evidence for cruciferous phytochemicals, not as a test of this ingredient.
  3. Bogaards JJ, Verhagen H, Willems MI, et al. Consumption of Brussels sprouts results in elevated alpha-class glutathione S-transferase levels in human blood plasma. Carcinogenesis. 1994;15(5):1073-5..PubMedUsed to support: Ten healthy male non-smokers, five eating 300 g of cooked Brussels sprouts a day for three weeks against five on a glucosinolate-free diet: plasma alpha-class GST rose 1.4-fold (p=0.002), with no change in controls. Human evidence in the correct species for the Phase II detoxification benefit. Limits: five people per arm, an enzyme marker rather than a health outcome, and a 300 g/day cooked vegetable dose rather than a powder.
  4. Nijhoff WA, Grubben MJ, Nagengast FM, et al. Effects of consumption of Brussels sprouts on intestinal and lymphocytic glutathione S-transferases in humans. Carcinogenesis. 1995;16(9):2125-8..PubMedUsed to support: Crossover in ten healthy non-smokers, 300 g/day cooked Brussels sprouts for one week: rectal GST-alpha rose about 30 percent and GST-pi about 15 percent, while lymphocyte GST was unchanged. Correct species and route for the detoxification claim, and it also records where the effect was not seen.
  5. Verhagen H, Poulsen HE, Loft S, et al. Reduction of oxidative DNA-damage in humans by brussels sprouts. Carcinogenesis. 1995;16(4):969-70..PubMedUsed to support: Ten healthy male non-smokers, five eating 300 g of cooked Brussels sprouts a day for three weeks: urinary 8-oxo-7,8-dihydro-2'-deoxyguanosine fell 28 percent (p=0.039), with no difference between periods in the control group. An antioxidant-relevant outcome measured in the correct species. Limits: five people per arm, a damage marker rather than a health outcome, and a 300 g/day cooked vegetable dose rather than a powder.
  6. Verhagen H, de Vries A, Nijhoff WA, et al. Effect of Brussels sprouts on oxidative DNA-damage in man. Cancer Lett. 1997;114(1-2):127-30..PubMedUsed to support: Randomised crossover in ten non-smokers, five men and five women, 300 g/day for one week in each period: urinary 8-oxodG fell in four of five men, rose in one, and no effect was found in the women. Included for balance, as the partial non-replication of the 1995 result.
  7. Obi N, Vrieling A, Heinz J, et al. Estrogen metabolite ratio: Is the 2-hydroxyestrone to 16α-hydroxyestrone ratio predictive for breast cancer?. Int J Womens Health. 2011;3:37-51..PubMedUsed to support: Review of nine studies, six of them prospective, covering 682 premenopausal and 1189 postmenopausal cases, concluding that results of the prospective studies do not support the hypothesis that the estrogen metabolite ratio can be used as a predictive marker for breast cancer risk. Establishes that a shift in this ratio is a laboratory measure rather than a health outcome.
  8. Ovesen L, Lyduch S, Idorn ML The effect of a diet rich in brussels sprouts on warfarin pharmacokinetics. Eur J Clin Pharmacol. 1988;34(5):521-3..PubMedUsed to support: Ten healthy subjects given 20 mg oral warfarin before and after two weeks of 400 g/day Brussels sprouts: elimination rate constant up 29 percent, metabolic clearance rate up 27 percent, plasma AUC down 16 percent. Safety evidence in the correct species showing the warfarin interaction is enzyme induction as well as vitamin K, both pushing toward weaker anticoagulation. I confirmed all three figures against the record before accepting.
  9. Pantuck EJ, Pantuck CB, Garland WA, et al. Stimulatory effect of brussels sprouts and cabbage on human drug metabolism. Clin Pharmacol Ther. 1979;25(1):88-95..PubMedUsed to support: Ten volunteers ate a control diet, then a Brussels sprouts and cabbage diet for seven days, then the control diet again. On the test diet mean antipyrine plasma half-life fell 13 percent and metabolic clearance rose 11 percent, and phenacetin plasma concentrations fell 34 to 67 percent from 0.5 to 7 hours after dosing, with values returning to baseline on the control diet. Human evidence on the vegetable itself behind the drug-metabolism interaction warning.
  10. Davis SJ, Arscott SA, Goltz S, et al. Urinary 2- to 16α-hydroxyestrone ratio did not change with cruciferous vegetable intake in premenopausal women. Int J Vitam Nutr Res. 2024;94(3-4):177-186..PubMedUsed to support: Randomised placebo-controlled trial in 78 healthy premenopausal women aged 38 to 50 with baseline 2:16 ratios at or below 3.0. For eight weeks they took either six capsules a day containing 550 mg of dried Brussels sprouts and kale each, about 3.3 g/day, or 40 g a day of broccoli or Brussels sprouts, or placebo, with urinary 2:16 and creatinine measured at baseline, four and eight weeks. There was no treatment effect (P=0.9) and no treatment-by-time interaction (P=0.6), confirmed in per-protocol analysis. This is the closest test that exists of the product as sold, a dried cruciferous powder in capsules in the same dose range as a supplement serving, on the exact endpoint the page previously claimed, and it was null.
  11. Hoelzl C, Glatt H, Meinl W, et al. Consumption of Brussels sprouts protects peripheral human lymphocytes against 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (PhIP) and oxidative DNA-damage: results of a controlled human intervention trial. Mol Nutr Food Res. 2008;52(3):330-41..PubMedUsed to support: Eight people ate 300 g of Brussels sprouts a day; in comet assays afterwards, DNA migration induced by PhIP was 97 percent lower and damage caused by hydrogen peroxide 39 percent lower, endogenous oxidised bases fell, and serum vitamin C rose 37 percent, with no correlation between the vitamin change and the protection. A second independent group finding an antioxidant-relevant outcome in the correct species. Limits: eight people, no placebo arm, cell-level markers rather than health outcomes, and a 300 g/day whole-vegetable dose far above a powder serving.
  12. Vermillion Maier ML, Siddens LK, Pennington JM, et al. Benzo[a]pyrene toxicokinetics in humans following dietary supplementation with 3,3'-diindolylmethane (DIM) or Brussels sprouts. Toxicol Appl Pharmacol. 2023;460:116377..PubMedUsed to support: Volunteers on a cruciferous-restricted diet took either 50 g of Brussels sprouts a day or 300 mg of BR-DIM for seven days before a micro-dose of radiolabelled benzo[a]pyrene. Both reduced the total label recovered from plasma by 56 to 67 percent against no intervention, and DIM markedly increased Tmax and reduced Cmax, indicating slower absorption. The most recent and lowest-dose human evidence that Brussels sprouts change the handling of a real pollutant, and the strongest support for the Detox and Cleanse category. Limits: 50 g a day of fresh vegetable is the equivalent of roughly 7 g of dried powder, still above a typical 1 to 5 g serving, and the outcome is a toxicokinetic marker rather than a health outcome.
  13. Nanjee MN, Verhagen H, van Poppel G, et al. Do dietary phytochemicals with cytochrome P-450 enzyme-inducing activity increase high-density-lipoprotein concentrations in humans?. Am J Clin Nutr. 1996;64(5):706-11..PubMedUsed to support: In healthy non-smoking men aged 20 to 28, replacing 300 g a day of glucosinolate-free vegetables with 300 g a day of Brussels sprouts for three weeks produced no significant increase in plasma apolipoprotein A-I, apolipoprotein A-II, HDL cholesterol or HDL phospholipids. A null cardiovascular result in the correct species at a dose far above any powder serving, and the reason this page makes no heart claim.