How much vitamin C is in savoy cabbage?

Savoy cabbage contains approximately 49.06 mg of vitamin C per 100 g fresh weight, providing roughly 54% of the EU recommended daily intake of 80 mg. This level varies by cultivar and storage conditions, as ascorbic acid degrades with prolonged heat exposure and long-term refrigeration.

What are glucosinolates in savoy cabbage and what do they do?

Savoy cabbage contains glucosinolates measured at approximately 195.22 µmol sinigrin equivalents per 100 g, with sinigrin being the predominant compound. When the cabbage is chopped or chewed, the enzyme myrosinase converts sinigrin into allyl isothiocyanate, which activates Nrf2-driven phase II detoxification enzymes including glutathione S-transferase, potentially supporting cellular defense against oxidative damage.

Is savoy cabbage good for antioxidants?

Yes, savoy cabbage cv. Dama has been measured at 102.71 mg chlorogenic acid equivalents per 100 g fresh weight for total phenolic content, indicating substantial antioxidant capacity in vitro. However, these measurements come from laboratory DPPH and FRAP assays, and whether this translates to meaningful antioxidant effects in the human body has not been confirmed by clinical trials.

Can savoy cabbage interfere with thyroid medication or warfarin?

Savoy cabbage contains goitrogenic glucosinolate byproducts (thiocyanates) that can competitively inhibit iodine uptake via the sodium-iodide symporter, potentially reducing thyroid hormone synthesis; individuals on levothyroxine or with Hashimoto's disease should avoid very high daily intake. Additionally, as a green cruciferous vegetable it contains vitamin K, which can reduce the efficacy of warfarin by promoting clotting factor synthesis, so patients on anticoagulant therapy should maintain consistent consumption levels and have INR monitored.

What is the difference between savoy cabbage and regular green cabbage nutritionally?

Savoy cabbage (Brassica oleracea var. sabauda) generally contains higher concentrations of phenolic compounds and certain glucosinolates compared to smooth-leaf green cabbage (var. capitata), with cultivar-specific variation in chlorogenic acid and sinigrin content documented in compositional studies. Both provide similar vitamin C ranges, but savoy's crinkled leaves have a higher surface-area-to-volume ratio that may influence phytochemical concentration and bioavailability, though direct head-to-head clinical comparisons in humans are lacking.

How does cooking affect the nutrient content of savoy cabbage?

Cooking methods significantly impact savoy cabbage's nutrient profile, particularly its vitamin C and glucosinolate content. Steaming and microwaving preserve more glucosinolates compared to boiling, which can leach water-soluble compounds into cooking water. Raw savoy cabbage retains maximum vitamin C (49.06 mg/100g FW) and phenolic antioxidants, though cooked cabbage may have improved bioavailability of carotenoids due to cell wall breakdown. Light cooking (5-10 minutes) offers a balance between nutrient retention and potential bioavailability enhancement.

Is savoy cabbage safe for people taking blood thinners or medications requiring consistent vitamin K intake?

Savoy cabbage contains significant vitamin K, which can interact with anticoagulant medications like warfarin by reducing drug effectiveness if intake varies inconsistently. People on blood thinners should maintain consistent savoy cabbage consumption rather than avoiding it completely, as stable dietary vitamin K intake allows proper medication dosing. Consultation with a healthcare provider or pharmacist is essential before making dietary changes when taking anticoagulants. Those on stable warfarin therapy who regularly consume cruciferous vegetables have successfully maintained therapeutic INR levels with proper medical monitoring.

What populations benefit most from including savoy cabbage in their regular diet?

Individuals seeking antioxidant support and those with limited access to diverse vegetables benefit significantly from savoy cabbage's concentrated phenolic content (102.71 mg chlorogenic acid equiv./100g FW) and glucosinolate profile. Older adults and those with compromised nutrient absorption may particularly benefit from savoy cabbage's nutrient density relative to its low calorie content. People managing inflammatory conditions may benefit from the cruciferous vegetables' glucosinolate compounds, though current evidence is limited to in vitro studies. Families with limited budgets can maximize nutritional intake using savoy cabbage as an affordable, nutrient-dense staple vegetable.

Brassica oleracea var. sabauda (Savoy Cabbage)

Savoy cabbage (Brassica oleracea var. sabauda) is a cruciferous vegetable rich in glucosinolates, particularly sinigrin, which are hydrolyzed by myrosinase into bioactive isothiocyanates such as allyl isothiocyanate that modulate detoxification enzymes. It also provides significant phenolic antioxidants and vitamin C, contributing to oxidative stress reduction through direct free radical scavenging.

Category: Vegetable Evidence: 2/10 Tier: Emerging

Brassica oleracea var. sabauda (Savoy Cabbage) — Hermetica Encyclopedia

Origin & History

Brassica oleracea var. sabauda (Savoy cabbage) is a cultivated variety of cabbage originating from Europe, characterized by its distinctive wrinkled leaves and ranking among the oldest Brassica vegetables. It is sourced directly from agricultural cultivation and typically consumed fresh or processed, containing antioxidant phytochemicals including vitamins, carotenoids, and phenolics.

Historical & Cultural Context

Savoy cabbage is described as one of Europe's oldest Brassica vegetables, valued for its antioxidant compounds. No specific traditional medicinal uses or ethnomedical context were documented in the available research.

Health Benefits

• Antioxidant support through high phenolic content (102.71 mg chlorogenic acid equiv./100 g FW in cv. Dama) - based on in vitro evidence only
• Vitamin C source providing 49.06 mg/100 g fresh weight - nutritional analysis only, no clinical trials
• Glucosinolate content (195.22 µmol sinigrin equiv./100 g FW) associated with cruciferous vegetable benefits - in vitro evidence only
• Carotenoid provision including β-carotene (0.37 mg/100 g) and lutein (0.18 mg/100 g) - compositional data only
• Free radical scavenging activity demonstrated through DPPH assays (up to 1.18 µmol DPPH/g) - in vitro evidence only

How It Works

Glucosinolates in savoy cabbage, measured at approximately 195.22 µmol sinigrin equivalents per serving, are cleaved by the endogenous enzyme myrosinase upon cell disruption to yield isothiocyanates and indoles, which induce phase II detoxification enzymes including glutathione S-transferase and quinone reductase via activation of the Nrf2/ARE (antioxidant response element) pathway. Phenolic compounds such as chlorogenic acid (up to 102.71 mg/100 g FW in cv. Dama) inhibit lipid peroxidation and scavenge reactive oxygen species directly. Vitamin C at 49.06 mg/100 g FW supports enzymatic antioxidant recycling and collagen biosynthesis through prolyl hydroxylase co-factor activity.

Scientific Research

No human clinical trials, RCTs, or meta-analyses were identified for Savoy cabbage specifically. Available research consists solely of phytochemical analyses and in vitro antioxidant capacity studies comparing different cultivars, with no PMIDs provided for clinical outcomes.

Clinical Summary

Evidence for savoy cabbage specifically is largely limited to in vitro assays and nutritional compositional analyses rather than controlled human clinical trials. Phenolic antioxidant capacity has been quantified ex vivo using DPPH and FRAP assays, demonstrating meaningful radical scavenging activity, but these findings have not been confirmed in randomized controlled trials. Broader cruciferous vegetable research involving related Brassica species in epidemiological cohort studies suggests associations between high consumption and reduced risk of certain cancers, though causality is not established. Mechanistic cell-culture and animal studies on sinigrin-derived isothiocyanates show induction of detoxification enzymes, but direct extrapolation to savoy cabbage supplementation in humans requires further clinical investigation.

Nutritional Profile

Savoy Cabbage (Brassica oleracea var. sabauda) provides a low-calorie, nutrient-dense profile per 100 g fresh weight (FW). Macronutrients: approximately 25 kcal, 1.8–2.0 g protein, 0.1 g fat, 5.8 g total carbohydrates, 3.1 g dietary fiber (mix of soluble pectin and insoluble cellulose/hemicellulose). Micronutrients: Vitamin C at 49.06 mg/100 g FW (approximately 54% of EU RDA), Vitamin K1 approximately 68–76 µg/100 g FW, Folate (B9) approximately 80 µg/100 g FW (~40% RDA), Vitamin A precursors via carotenoids (beta-carotene ~600 µg/100 g FW, lutein + zeaxanthin ~300 µg/100 g FW — bioavailability enhanced by co-consumption with dietary fat), Potassium ~230 mg/100 g FW, Calcium ~35 mg/100 g FW (bioavailability partially limited by oxalate content), Magnesium ~20 mg/100 g FW, Manganese ~0.18 mg/100 g FW. Bioactive compounds: Total phenolics at 102.71 mg chlorogenic acid equivalents/100 g FW (cv. Dama; values vary by cultivar), including kaempferol, quercetin, and sinapic acid derivatives; Glucosinolates at 195.22 µmol sinigrin equivalents/100 g FW — predominantly sinigrin, glucobrassicin, and gluconapin, which are hydrolyzed by myrosinase (activated by chopping/chewing) to bioactive isothiocyanates (e.g., allyl isothiocyanate) and indoles (e.g., indole-3-carbinol); myrosinase is heat-labile, so raw or lightly steamed preparation preserves conversion capacity. Sulforaphane precursor (glucoraphanin) present at lower levels than in broccoli. Vitamin C bioavailability is moderate but reduced by boiling (losses up to 50%); steaming retains approximately 80% of Vitamin C. Fiber includes prebiotic fructooligosaccharides supporting gut microbiota. Iron content approximately 0.4 mg/100 g FW — non-heme form with absorption enhanced by co-consumed Vitamin C.

Preparation & Dosage

No clinically studied dosage ranges are available as no human trials have been conducted. Phytochemical content is reported per 100 g fresh weight for nutritional reference only. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Other cruciferous vegetables, vitamin C, selenium, vitamin E, glutathione precursors

Safety & Interactions

Savoy cabbage is generally recognized as safe when consumed in culinary amounts, but high intake may suppress thyroid function due to goitrogenic compounds, particularly glucosinolate-derived thiocyanates that inhibit iodine uptake via sodium-iodide symporter; individuals with hypothyroidism or iodine deficiency should exercise caution. High vitamin K content (present in green leafy brassicas generally) can antagonize warfarin (coumadin) anticoagulation therapy, requiring monitoring of INR in patients on anticoagulants. Fermentation or cooking reduces glucosinolate content and myrosinase activity, altering the bioavailability of active isothiocyanates. Safety data specific to concentrated savoy cabbage extracts or supplements during pregnancy and lactation is insufficient; food-level consumption is considered safe during pregnancy.