# Brassica rapa var. rapa (Turnip Greens)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/brassica-rapa-var-rapa
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-04-01
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Brassica rapa var. rapa, turnip tops, turnip leaves, white turnip greens, turnip crown, foliage turnip, rapa greens, European turnip greens, field mustard greens, wild turnip greens

## Overview

Turnip greens (Brassica rapa var. rapa) are rich in glucosinolates, kaempferol, and vitamins K and C, which drive their antioxidant and anticancer properties. These bioactives scavenge [free radical](/ingredients/condition/antioxidant)s, modulate Nrf2 signaling, and induce apoptosis in preclinical cancer cell models.

## Health Benefits

["\u2022 Supports Antioxidant Activity: In vitro assays show turnip greens exhibit [free radical scaveng](/ingredients/condition/antioxidant)ing (DPPH, FRAP), ferric reducing power, and can upregulate antioxidant enzymes like SOD and CAT. [1, 2]", "\u2022 Exhibits Antiproliferative Effects: Preclinical research indicates that turnip green extracts show cytotoxic effects against various cancer cell lines, including HeLa, HCT-116, and MCF-7. [1, 3]", "\u2022 Provides [Antimicrobial](/ingredients/condition/immune-support) Properties: Glucosinolates and their breakdown products, such as allyl isothiocyanate, have demonstrated antibacterial and antifungal activity in laboratory settings. [1, 2, 3]", "\u2022 May Offer DNA Protection: In cellular models, compounds in turnip greens have been shown to inhibit DNA damage and interfere with DNA methylation, a key process in gene expression. [1, 3]", "\u2022 Shows Potential [Neuroprotective](/ingredients/condition/cognitive) & Antidiabetic Action: Phenolics and flavonoids found in turnip greens have been linked to neuroprotective, antidiabetic, and antigenotoxic pathways in preclinical models. [1, 3]"]

## Mechanism of Action

Glucosinolates in turnip greens are hydrolyzed by myrosinase into isothiocyanates (e.g., allyl isothiocyanate), which activate the Nrf2-Keap1 pathway, upregulating cytoprotective enzymes including superoxide dismutase (SOD), catalase (CAT), and heme oxygenase-1 (HO-1). Kaempferol and quercetin glycosides inhibit pro-[inflammatory](/ingredients/condition/inflammation) NF-κB signaling and suppress cyclooxygenase-2 (COX-2) expression, reducing [oxidative stress](/ingredients/condition/antioxidant). The high vitamin K1 content supports carboxylation of osteocalcin and matrix Gla protein, directly contributing to [bone mineralization](/ingredients/condition/bone-health) and vascular calcium regulation.

## Clinical Summary

Most evidence for turnip greens is derived from in vitro cell assays and animal models rather than randomized controlled trials in humans, limiting direct clinical translation. In vitro DPPH and FRAP assays consistently demonstrate strong [free radical scaveng](/ingredients/condition/antioxidant)ing capacity, while cell-based studies show antiproliferative effects against HeLa and MCF-7 cancer cell lines at concentrations of 50–200 µg/mL. Epidemiological data from large cohort studies suggest that high cruciferous vegetable intake (≥1 serving/day) is associated with a 15–20% reduced risk of certain cancers, though turnip greens are rarely isolated as a variable. Human evidence specific to turnip greens remains sparse, and claims must be contextualized within broader cruciferous vegetable research.

## Nutritional Profile

Turnip greens (Brassica rapa var. rapa) are a nutrient-dense leafy vegetable. Per 100g raw weight: Calories ~32 kcal, Water ~89.7g, Protein ~1.5g, Total Carbohydrates ~7.1g, Dietary Fiber ~3.2g, Fat ~0.3g. Key Vitamins: Vitamin K1 (phylloquinone) ~251 µg (209% DV) — notably high bioavailability when consumed with dietary fat; Vitamin C ~60 mg (67% DV); Vitamin A (as beta-carotene) ~RAE 579 µg, with beta-carotene at ~6952 µg — bioavailability enhanced by cooking and fat co-ingestion; Folate (B9) ~194 µg (49% DV); Vitamin E (alpha-tocopherol) ~2.86 mg; Riboflavin (B2) ~0.1 mg; Vitamin B6 ~0.26 mg. Key Minerals: Calcium ~190 mg (15% DV) — bioavailability relatively high (~52%) compared to spinach due to lower oxalate content; Potassium ~296 mg; Manganese ~0.47 mg; Iron ~1.1 mg (non-heme, absorption enhanced by co-ingested Vitamin C); Magnesium ~31 mg; Phosphorus ~42 mg; Copper ~0.35 mg; Zinc ~0.19 mg. Bioactive Compounds: Glucosinolates (total ~35–60 µmol/g dry weight), predominantly gluconasturtiin (phenethyl glucosinolate) and glucobrassicin — hydrolyzed to isothiocyanates and indole-3-carbinol upon chewing/cooking, with enzymatic activity (myrosinase) partially destroyed by boiling; Carotenoids: lutein + zeaxanthin ~12,825 µg per 100g — highly relevant for macular health; Flavonoids: quercetin, kaempferol, and isorhamnetin glycosides present at approximately 20–40 mg/100g total; Hydroxycinnamic acids: sinapic acid and ferulic acid derivatives identified in leaf extracts; Chlorophyll a and b present (~100–200 mg/100g fresh weight). Fiber composition includes both soluble (pectin) and insoluble (cellulose, hemicellulose) fractions. Cooking reduces Vitamin C (~30–50% loss by boiling), glucosinolate content (~30–60% leaching into cooking water), and folate (~25–40% loss), but increases carotenoid bioaccessibility due to cell wall breakdown.

## Dosage & Preparation

No clinically studied dosage ranges for turnip greens in extract, powder, or standardized forms exist due to a lack of human trials. Preclinical studies quantify total phenolic content (e.g., 7.85-9.66 mg GAE/g DW), but this does not translate to a human dose. [1, 2] Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Turnip greens contain high vitamin K1 (approximately 138 µg per 100g cooked), which can significantly antagonize warfarin (coumadin) anticoagulation therapy; patients on warfarin should maintain consistent intake and consult their physician. The goitrogenic compounds goitrin and thiocyanates, derived from glucosinolate hydrolysis, may suppress [thyroid](/ingredients/condition/hormonal) hormone synthesis at high consumption levels, making excessive intake a concern for individuals with hypothyroidism or iodine deficiency. Oxalate content, while moderate, may increase kidney stone risk in calcium-oxalate stone formers who consume large quantities. Turnip greens are generally considered safe during pregnancy as a whole food, providing folate and calcium, though concentrated supplements have not been evaluated in pregnant populations.

## Scientific Research

The research dossier lacks any specific human clinical trials, randomized controlled trials (RCTs), or meta-analyses for Brassica rapa var. rapa. No PubMed PMIDs for human studies on turnip greens were identified, and the available evidence is confined to preclinical and in vitro models. [1, 3]

## Historical & Cultural Context

The available research identifies Brassica rapa var. rapa primarily as a nutrient-dense food crop. There is no documented evidence of its specific use within traditional medicine systems like Ayurveda or TCM. [1-7]

## Synergistic Combinations

Sulforaphane, Curcumin, Selenium, Vitamin C, EGCG (from Green Tea)

## Frequently Asked Questions

### How much vitamin K is in turnip greens?

Cooked turnip greens provide approximately 138 micrograms of vitamin K1 (phylloquinone) per 100-gram serving, exceeding the adult adequate intake of 90–120 µg/day. This makes them one of the more concentrated dietary sources of vitamin K among leafy greens, and individuals on anticoagulant medications like warfarin must monitor their intake carefully to avoid altering INR levels.

### Do turnip greens have anticancer properties?

Preclinical evidence indicates that turnip green extracts exhibit antiproliferative activity against several cancer cell lines, including HeLa (cervical) and MCF-7 (breast) cells, at concentrations of 50–200 µg/mL in vitro. This effect is attributed primarily to isothiocyanates derived from glucosinolate hydrolysis, which induce mitochondria-mediated apoptosis and G2/M cell cycle arrest. However, no human clinical trials have confirmed these effects in vivo, and current findings should not be interpreted as cancer treatment evidence.

### Can turnip greens affect thyroid function?

Yes, turnip greens contain glucosinolates that are hydrolyzed into goitrogenic compounds, specifically goitrin and thiocyanates, which compete with iodine uptake in the thyroid gland and can inhibit thyroid peroxidase activity. This effect is most relevant at very high, consistent consumption levels and in individuals who are already iodine deficient or have underlying hypothyroidism. Cooking deactivates a significant portion of myrosinase enzyme activity, thereby reducing goitrogenic compound formation.

### What are the main antioxidants in turnip greens?

The primary antioxidant compounds in turnip greens include kaempferol, quercetin, and isorhamnetin glycosides, alongside vitamin C (approximately 60 mg per 100g raw), beta-carotene, and glucosinolate-derived isothiocyanates. These compounds neutralize reactive oxygen species (ROS) through direct radical scavenging and by upregulating endogenous antioxidant enzymes SOD and CAT via Nrf2 pathway activation. FRAP and DPPH assays confirm moderate-to-high antioxidant capacity relative to other dark leafy greens.

### Are turnip greens good for bone health?

Turnip greens contribute to bone health through two primary nutrients: calcium (approximately 190 mg per 100g cooked, with relatively good bioavailability compared to spinach due to lower oxalate binding) and vitamin K1, which is required for the gamma-carboxylation of osteocalcin, a protein essential for incorporating calcium into bone matrix. Vitamin K insufficiency is associated with lower bone mineral density and increased fracture risk in observational studies. While no clinical trials have tested turnip greens specifically for bone outcomes, their nutrient profile is consistent with dietary patterns linked to skeletal health.

### What is the bioavailability difference between fresh turnip greens and supplements?

Fresh turnip greens contain higher levels of heat-sensitive nutrients and volatile compounds compared to dried or powdered supplements, which may lose potency during processing. However, cooked turnip greens can actually improve the bioavailability of fat-soluble vitamins like vitamin K by breaking down cell walls, while supplements standardize active compound concentrations. For maximum nutrient absorption, consuming fresh or lightly steamed turnip greens alongside dietary fat is more effective than supplement forms alone.

### Is turnip greens supplementation safe during pregnancy and breastfeeding?

Whole turnip greens are safe and nutritious during pregnancy and breastfeeding when consumed in normal food amounts; however, high-dose extracts should be discussed with a healthcare provider due to limited safety data in these populations. Turnip greens are rich in folate and minerals beneficial for fetal development, but their goitrogenic compounds (though minimal when cooked) warrant moderation in those with iodine deficiency or thyroid conditions during pregnancy. Always consult with an obstetrician before using concentrated turnip green supplements during pregnancy or lactation.

### How do turnip greens compare to other cruciferous greens like kale or collards for antioxidant content?

Turnip greens contain comparable levels of glucosinolates and phenolic compounds to kale and collards, though specific antioxidant profiles vary; kale typically has higher lutein content while turnip greens excel in vitamin K and calcium. All three cruciferous greens demonstrate similar free radical scavenging capacity in laboratory assays (DPPH, FRAP methods), making them roughly equivalent in antioxidant potency gram-for-gram. Nutritionally, turnip greens are often more affordable and milder in flavor than kale, while providing nearly identical antioxidant and anticancer-supporting benefits.

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