Brassica Oleracea Herb (Brassica oleracea): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Brassica oleracea help heal stomach ulcers?

Brassica oleracea contains glucosinolates that convert to sulforaphane, which stimulates protective mucus production in the stomach lining and inhibits Helicobacter pylori bacteria. The herb also provides vitamin C and amino acids like glutamine that support tissue repair. Traditional European medicine has used cabbage juice for gastroprotection, and preliminary research suggests these compounds may accelerate ulcer healing, though evidence remains at Level C.

Does cabbage interact with blood thinners like warfarin?

Brassica oleracea vegetables contain vitamin K, which can antagonize the effects of anticoagulant medications like warfarin. Consuming large or inconsistent amounts of cabbage, kale, or broccoli may interfere with blood thinner effectiveness and require dosage adjustments. Patients on anticoagulants should maintain consistent intake and consult their healthcare provider before significantly increasing Brassica consumption. This interaction is well-documented in clinical practice.

How much cabbage juice should I drink for stomach ulcers?

Traditional European folk medicine recommends 100-200ml of fresh cabbage juice daily for stomach ulcer support, typically divided into two doses. This amount provides beneficial glucosinolates and vitamin C without excessive gas production. Evidence for this specific dosage is rated at Level C, based primarily on traditional use and preliminary studies rather than large clinical trials. Fresh juice is preferred over cooked preparations, as heat degrades active compounds.

Is cabbage safe to eat during pregnancy?

Brassica oleracea is considered safe during pregnancy when consumed as a food in normal amounts. The vegetable provides folate, vitamin C, and fiber that support maternal health. However, excessive consumption should be avoided, and proper washing is essential to reduce foodborne illness risk. Pregnant women with thyroid conditions should consult healthcare providers before consuming large quantities, as cruciferous vegetables may affect iodine absorption.

What are the medicinal benefits of wild cabbage?

Wild cabbage has been used traditionally for stomach ulcers, skin conditions, and as an anti-inflammatory food herb. Modern research investigates its potential anticancer properties, attributed to sulforaphane and indole-3-carbinol. These compounds show promise in laboratory studies for cellular health. The herb also offers gastroprotective benefits and may support skin healing when applied topically. Evidence remains at Level C, requiring more human clinical trials to confirm traditional uses.

Can eating too much cabbage cause thyroid problems?

Excessive consumption of Brassica oleracea can potentially disrupt thyroid function due to goitrogenic compounds called glucosinolates. These substances may interfere with iodine uptake and thyroid hormone synthesis when consumed in very large amounts, particularly in individuals with existing thyroid conditions. Cooking reduces goitrogenic activity. People with hypothyroidism or thyroid disorders should moderate intake and consult healthcare providers. Normal dietary amounts typically pose no significant risk to healthy individuals.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 29 PubMed articles · model: gemma4:31b

Summary

Brassica oleracea is an agronomically important species of the Brassicaceae family comprising nutrient-rich vegetables such as broccoli, cabbage, and cauliflower [PMID:36012543, PMID:18274519]. It is recognized for its high nutritional value and the presence of bioactive phytochemicals with potential health benefits [PMID:36092435, PMID:40007500].

Background

Brassica oleracea is a cultivated diploid vegetable crop with significant morphological diversity, including various morphotypes such as var. italica (broccoli), var. capitata (cabbage), and var. botrytis (cauliflower) [PMID:38421062, PMID:18274519, PMID:30066219]. It is grown and consumed globally and is used as a model for studies on genome evolution and morphology [PMID:36012543, PMID:36092435].

Active compounds

The herb contains a variety of phytochemicals, including glucosinolates (such as glucoraphanin), and their hydrolysis products like sulforaphane (an isothiocyanate) [PMID:37129118, PMID:40007500]. Other identified compounds include phenolic acids (sinapic acid, ferulic acid, salicylic acid), flavones, alkaloids, sulfur compounds, and flavonoids such as kaempferol and quercetin [PMID:36838827, PMID:37907131, PMID:28208739].

Mechanism of action

Broccoli-derived phytochemicals, particularly sulforaphane, provide antioxidant effects and modulate molecules involved in cell cycle regulation, apoptosis, and enzyme activity [PMID:37129118]. Brassica oleracea extract may regulate HIF-1α-mediated glycolysis to inhibit cardiomyocyte hypertrophy and reduce reactive oxygen species and apoptosis-related proteins [PMID:37907131]. In hair follicle cells, extracts and sulforaphane can prevent testosterone-induced inhibition of cell viability and up-regulate cytokeratin gene expression [PMID:33901343].

Clinical evidence

Evidence CCancer

Consumption of broccoli-derived phytochemicals, specifically sulforaphane, is associated with chemopreventive effects and lower susceptibility to developing cancers [PMID:37129118].

Evidence DType 2 Diabetes Mellitus

Extracts from flowers of Brassica oleracea var. italica were found to prevent hyperglycemia [PMID:35465108]; red cabbage extract in rats lowered blood glucose levels and reversed adverse effects of diabetes [PMID:18830445].

Evidence DDiabetic Nephropathy

Daily oral ingestion of red cabbage extract in rats restored renal function and attenuated oxidative stress markers like malondialdehyde [PMID:18830445].

Evidence DMyocardial Injury

Brassica oleracea leaf extract ameliorated isoproterenol-induced myocardial injury in H9C2 cells and Wistar rats by reducing cardiomyocyte hypertrophy and ROS levels [PMID:37907131].

Evidence DAndrogenic Alopecia

In vitro and ex vivo studies indicate that Brassica oleracea extract, glucosinolates, and sulforaphane promote hair growth by preventing testosterone-induced inhibition of dermal papilla cell viability [PMID:33901343].

Safety & adverse effects

In a study on flower extracts, mortality was nil up to 2,000 mg/kg [PMID:35465108].

Pregnancy & lactation

Broccoli has no specific use during breastfeeding, though sulforaphane is detectable in breastmilk [PMID:41855365]. Low-quality evidence suggests maternal cabbage ingestion might cause colic in breastfed infants, although there is no good evidence to support the assumption that eliminating broccoli changes infant behavior [PMID:41855365].

Evidence summary

The evidence consists primarily of in vitro studies, animal models (rats), and literature reviews. There are no human clinical trials provided in the abstracts; therefore, the overall strength of clinical evidence is low (Level C/D).

PubMed sources

1.PMID: 16988364 (2006) — Brassica oleracea. · Methods in molecular biology (Clifton, N.J.)
2.PMID: 41855365 (2006) — Editorial: Phytochemicals in ornamental plants: Synthesis, nutraceutical prospects and applied focus-Women in plant science series. · Frontiers in plant science
3.PMID: 42326000 (2026) — The Paraphyletic Origins of Genetic Resistance to Cabbage Stem Flea Beetle in Brassica oleracea. · Plant-environment interactions (Hoboken, N.J.)
4.PMID: 30066219 (2018) — Tissue culture and genetic transformation of cabbage (Brassica oleracea var. capitata): an overview. · Planta
5.PMID: 41859830 (2026) — Identification of Brassica oleracea germplasm resources resistant to Plutella xylostella (L.). · Pest management science

Brassica Oleracea Herb

Sources & Citations

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