# Beta vulgaris subsp. cicla (Swiss Chard)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/beta-vulgaris-subsp-cicla
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Swiss chard, Chard, Silverbeet, Perpetual spinach, Leaf beet, Seakale beet, White beet, Rainbow chard, Ruby chard, Beta vulgaris var. cicla, Beta vulgaris subsp. cicla

## Overview

Swiss chard (Beta vulgaris subsp. cicla) is a dark leafy green rich in betalains, flavonoids, and mineral electrolytes including potassium and magnesium that support cellular [energy metabolism](/ingredients/condition/energy) and redox balance. Its ethanol-extractable polyphenols demonstrate [free radical scaveng](/ingredients/condition/antioxidant)ing activity via electron donation, while its dense mineral profile supports enzymatic cofactor functions throughout the body.

## Health Benefits

• High mineral content: Contains significant levels of calcium (10.1-13.9 g/kg), potassium (64.5-92.3 g/kg), and magnesium (6.4-9.4 g/kg) - based on compositional analysis only
• [Antioxidant](/ingredients/condition/antioxidant) properties: Ethanol extracts demonstrated significant antioxidant capacity in vitro - preliminary evidence only
• Potential blood sugar support: Shows α-amylase and α-glucosidase enzyme inhibition in laboratory studies - no human trials
• Nutrient density: Leaves contain high fiber, sodium, magnesium, flavonoids, and vitamin C - compositional data only
• Phytochemical diversity: Contains 192 compounds including betalains (20%), flavonoids (11%), and phenolic acids - analytical studies only

## Mechanism of Action

Swiss chard contains betalains (betacyanins and betaxanthins) and flavonoids such as quercetin and kaempferol that donate hydrogen atoms to neutralize [reactive oxygen species](/ingredients/condition/antioxidant), inhibiting lipid peroxidation chain reactions. Its high potassium content (64.5–92.3 g/kg dry weight) supports Na+/K+-ATPase pump activity, maintaining membrane potential in cardiac and skeletal muscle cells. Magnesium (6.4–9.4 g/kg) acts as a cofactor for over 300 enzymatic reactions including [ATP synthesis](/ingredients/condition/energy) via Mg2+-dependent ATPases and DNA polymerase activity.

## Clinical Summary

Current evidence for Swiss chard's bioactivity is largely limited to in vitro compositional analyses and extract-based [antioxidant](/ingredients/condition/antioxidant) assays, with no large-scale randomized controlled trials specifically evaluating supplemental Swiss chard in humans. Ethanol extracts have shown significant DPPH and ABTS radical scavenging capacity in laboratory models, indicating antioxidant potential that has not yet been confirmed at clinical doses. Mineral content data derives from compositional studies rather than bioavailability or intervention trials, meaning actual human uptake of calcium, potassium, and magnesium from Swiss chard may differ substantially from raw compositional figures. Overall, the evidence base is preliminary and promising but insufficient to make quantified therapeutic claims.

## Nutritional Profile

Swiss Chard (Beta vulgaris subsp. cicla) per 100g fresh weight: Macronutrients - Calories: ~19 kcal; Carbohydrates: 3.7g; Protein: 1.8g; Fat: 0.2g; Dietary Fiber: 1.6g. Key Minerals (fresh weight basis, consistent with reported dry weight values of Ca 10.1-13.9 g/kg, K 64.5-92.3 g/kg, Mg 6.4-9.4 g/kg): Potassium: ~379mg (one of the highest among leafy vegetables); Calcium: ~51mg (bioavailability moderately reduced by oxalic acid content ~645mg/100g, which binds calcium forming insoluble calcium oxalate); Magnesium: ~81mg; Sodium: ~213mg (naturally elevated); Iron: ~1.8mg; Phosphorus: ~46mg. Vitamins: Vitamin K1 (phylloquinone): ~830mcg (exceptionally high, >600% DV); Vitamin A (as beta-carotene): ~306mcg RAE; Vitamin C: ~30mg; Folate: ~14mcg; Vitamin E (alpha-tocopherol): ~1.9mg; Riboflavin (B2): ~0.09mg; Thiamine (B1): ~0.04mg. Bioactive Compounds: Betalains present in red-stemmed varieties including betacyanins (betanin) and betaxanthins - concentration varies significantly by cultivar and stem color; Flavonoids including quercetin-3-rutinoside and kaempferol glycosides identified in leaf extracts; Chlorophyll a and b in green leaf portions; Lutein and zeaxanthin: ~11mg combined (relevant for ocular health, bioavailability enhanced with dietary fat co-consumption). Bioavailability Notes: Oxalate content significantly limits calcium and iron absorption; cooking (blanching, boiling) reduces oxalate by 30-50% and improves mineral bioavailability; fat-soluble compounds (carotenoids, Vitamin K, Vitamin E) require co-ingestion of dietary fat for optimal absorption; Vitamin C content degrades with heat exposure.

## Dosage & Preparation

No clinically studied dosage ranges for Swiss chard extracts, powders, or standardized forms have been established due to the absence of human trials. Current research only analyzes whole plant parts without standardization or dosing recommendations. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Swiss chard contains high levels of oxalic acid, which binds dietary calcium and may contribute to calcium oxalate kidney stone formation in susceptible individuals, particularly those with a history of nephrolithiasis. Its substantial vitamin K content (predominantly phylloquinone) can antagonize warfarin (coumadin) anticoagulation therapy, and patients on warfarin should maintain consistent Swiss chard intake and consult their physician. The high potassium content poses a theoretical hyperkalemia risk for individuals with impaired renal function or those taking potassium-sparing diuretics, ACE inhibitors, or ARBs. Swiss chard is generally considered safe during pregnancy when consumed as food, but concentrated extracts have not been evaluated for gestational safety.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses specific to Swiss chard were identified in the research. Studies are limited to in vitro [antioxidant](/ingredients/condition/antioxidant) capacity assessments, enzyme inhibition analyses, and compositional studies in laboratory settings without any human trial data or PubMed PMIDs for clinical outcomes.

## Historical & Cultural Context

No historical or traditional medicine uses were documented in the available research. Swiss chard is noted as a modern nutrient-dense food and salad crop valued for its high mineral content, but without references to longstanding traditional therapeutic applications.

## Synergistic Combinations

Spinach, Kale, Beet root, Magnesium, Vitamin C

## Frequently Asked Questions

### How much potassium is in Swiss chard?

Compositional analyses report Swiss chard contains approximately 64.5 to 92.3 g of potassium per kilogram of dry weight, making it one of the more potassium-dense leafy greens. One cooked cup (approximately 175 g) provides roughly 960 mg of potassium, contributing meaningfully toward the adult adequate intake of 2,600–3,400 mg per day.

### Does Swiss chard have antioxidant properties?

Yes, ethanol extracts of Swiss chard have demonstrated significant antioxidant capacity in vitro, attributed primarily to betalain pigments (betacyanins and betaxanthins) and flavonoids including quercetin. These compounds donate electrons or hydrogen atoms to neutralize free radicals in DPPH and ABTS assay models, though clinical confirmation in human trials is still lacking.

### Can Swiss chard affect warfarin or blood thinners?

Swiss chard is rich in vitamin K1 (phylloquinone), which directly competes with warfarin's mechanism of inhibiting vitamin K-dependent clotting factors II, VII, IX, and X. Patients prescribed warfarin should keep their Swiss chard consumption consistent week to week rather than eliminating it, and should inform their healthcare provider to allow proper INR monitoring and dose adjustment.

### Is Swiss chard safe for people with kidney stones?

Swiss chard contains significant oxalic acid, which binds free calcium in the gut and urinary tract to form calcium oxalate crystals, a primary constituent of the most common kidney stone type. Individuals with a history of calcium oxalate nephrolithiasis are typically advised by urologists to limit high-oxalate foods like Swiss chard, chard-based supplements, and green smoothies containing large raw quantities.

### What minerals does Swiss chard contain?

Swiss chard provides calcium at 10.1–13.9 g/kg dry weight, potassium at 64.5–92.3 g/kg dry weight, and magnesium at 6.4–9.4 g/kg dry weight based on compositional analyses. These figures represent total elemental content rather than bioavailable fractions, and oxalate binding may reduce actual calcium absorption; magnesium and potassium bioavailability from cooked chard is generally considered favorable.

### Is Swiss chard safe during pregnancy and breastfeeding?

Swiss chard is generally recognized as safe for consumption during pregnancy and breastfeeding as a whole food source of nutrients like folate and calcium. However, its high vitamin K content may interact with anticoagulant medications some pregnant individuals take, so medical consultation is recommended. As with any dietary change during pregnancy, moderate consumption as part of a balanced diet is advisable, and excessive supplementation should be avoided without professional guidance.

### What is the difference between Swiss chard supplement forms and eating fresh Swiss chard?

Fresh Swiss chard provides nutrients in their natural food matrix with intact fiber, enzymes, and beneficial plant compounds, while concentrated supplements isolate specific components like extracts or powders. Whole food consumption offers synergistic nutrient interactions and better bioavailability for some minerals, whereas supplements may provide standardized doses but lack the full spectrum of compounds present in the whole leaf. For maximum nutrient absorption and health benefits, consuming fresh Swiss chard is generally preferred over isolated supplement forms.

### Can Swiss chard help with blood sugar management based on current research?

Laboratory studies demonstrate that Swiss chard exhibits α-amylase and α-glucosidase enzyme inhibition, mechanisms that theoretically could support blood sugar regulation by slowing carbohydrate digestion. However, this evidence is preliminary and limited to in vitro testing, and human clinical trials demonstrating practical blood sugar benefits are currently lacking. While Swiss chard is a nutrient-dense whole food suitable for diabetes-friendly diets due to its low glycemic index, its specific blood sugar-regulating effects require further clinical investigation before definitive claims can be made.

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