# Shallots (Allium cepa var. aggregatum)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/shallots
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-29
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Allium cepa var. aggregatum, Allium cepa Aggregatum group, French shallots, Eschalots, Gray shallots, Multiplier onions, Cluster onions, Bunching shallots

## Overview

Shallots (Allium cepa var. aggregatum) are a flavonoid-rich allium vegetable containing quercetin, kaempferol, and organosulfur compounds such as allicin precursors that exert antioxidant and [anti-inflammatory](/ingredients/condition/inflammation) effects. These bioactives work primarily by scavenging [free radical](/ingredients/condition/antioxidant)s, inhibiting pro-inflammatory enzymes like COX-2, and modulating redox-sensitive transcription factors including Nrf2.

## Health Benefits

• General [antioxidant](/ingredients/condition/antioxidant) support from flavonoids and phenolics (up to high mg GAEQ/g DW) - evidence quality: preliminary, no clinical trials available
• Potential [immune support](/ingredients/condition/immune-support) through vitamin C content (3.68-8.79 mg/100g fresh weight) - evidence quality: traditional use only, no clinical studies
• Possible [cardiovascular](/ingredients/condition/heart-health) benefits suggested for Allium family - evidence quality: no specific clinical evidence for shallots
• Potential anti-cancer properties from organosulfur compounds - evidence quality: theoretical only, no human studies
• Mineral support providing K, P, Ca, Mg, Fe, and Zn - evidence quality: compositional data only, no clinical outcomes

## Mechanism of Action

Quercetin and kaempferol in shallots activate the Nrf2/ARE pathway, upregulating endogenous antioxidant enzymes such as superoxide dismutase (SOD) and [glutathione](/ingredients/condition/detox) peroxidase (GPx), thereby reducing [oxidative stress](/ingredients/condition/antioxidant) at the cellular level. Organosulfur compounds, including alliin and its derivatives, inhibit NF-κB signaling, suppressing downstream production of [pro-inflammatory cytokine](/ingredients/condition/inflammation)s such as TNF-α and IL-6. Additionally, quercetin acts as a direct inhibitor of COX-2 and lipoxygenase (LOX) enzymes, reducing prostaglandin and leukotriene synthesis involved in acute inflammatory responses.

## Clinical Summary

Current evidence for shallots specifically is limited to in vitro cell studies and animal models, with no dedicated human clinical trials published as of 2024. Phenolic content measured in shallots ranges up to several hundred mg gallic acid equivalents per gram dry weight in laboratory analyses, suggesting meaningful [antioxidant](/ingredients/condition/antioxidant) capacity, but this has not been validated in human pharmacokinetic studies. Broader research on closely related Allium cepa (common onion) includes small human trials (n=20–70) showing modest improvements in [blood glucose](/ingredients/condition/weight-management) and lipid markers with quercetin supplementation, but these findings cannot be directly extrapolated to whole shallot consumption. The overall evidence quality remains preliminary, and shallots are not recognized by any regulatory body as a clinically validated therapeutic agent.

## Nutritional Profile

Shallots (Allium cepa var. aggregatum) provide approximately 72 kcal/100g dry weight with a macronutrient profile dominated by carbohydrates (~16.8g/100g fresh weight), modest protein (~2.5g/100g fresh weight), and negligible fat (~0.1g/100g fresh weight). Dietary fiber content is approximately 3.2g/100g fresh weight, supporting [digestive health](/ingredients/condition/gut-health). Key micronutrients include vitamin C (3.68–8.79mg/100g fresh weight, variable by cultivar and storage), vitamin B6 (pyridoxine ~0.345mg/100g), folate (~34mcg/100g), and vitamin A precursors from carotenoids. Mineral content includes potassium (~334mg/100g fresh weight), phosphorus (~60mg/100g), calcium (~37mg/100g), iron (~1.2mg/100g), and manganese (~0.292mg/100g). Bioactive compounds are a primary nutritional distinction: flavonoids including quercetin (predominant, reported at 3–7mg/100g fresh weight) and kaempferol, alongside anthocyanins in purple-skinned varieties (cyanidin-3-glucoside, 10–75mg/100g dry weight depending on cultivar). Total phenolic content reaches up to high mg gallic acid equivalents per gram dry weight (reported ranges of 15–80mg GAEQ/g DW across studies). Organosulfur compounds including allicin precursors (alliin) and thiosulfinates are present and formed upon tissue disruption, though at lower concentrations than garlic. Fructooligosaccharides (FOS) contribute prebiotic fiber. Bioavailability notes: quercetin from shallots is moderately bioavailable (~25–50% absorption); cooking reduces vitamin C and some flavonoids by 20–40%; organosulfur volatilization begins immediately upon cutting, reducing therapeutic concentration in cooked preparations.

## Dosage & Preparation

No clinically studied dosage ranges are available for shallot extracts, powders, or standardized forms. No standardization protocols or human trials have been documented. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Shallots are generally recognized as safe (GRAS) when consumed as food, with adverse effects rare at culinary doses; however, high-dose concentrated extracts may cause gastrointestinal irritation including bloating, nausea, and heartburn. Quercetin and organosulfur compounds may potentiate the effects of anticoagulant drugs such as warfarin by inhibiting platelet aggregation and CYP3A4-mediated drug [metabolism](/ingredients/condition/weight-management), warranting caution in patients on blood thinners. Individuals with irritable bowel syndrome (IBS) or fructose malabsorption should note that shallots are high in fructooligosaccharides (FODMAPs) and may exacerbate symptoms. Pregnant women consuming shallots in normal food amounts are considered safe, but concentrated supplements have not been studied in pregnancy and should be avoided without medical supervision.

## Scientific Research

The research dossier reveals no human clinical trials, RCTs, or meta-analyses specifically on shallots (Allium cepa var. aggregatum). General health claims exist for the Allium family but lack cited clinical study details, sample sizes, or PubMed PMIDs for shallots specifically.

## Historical & Cultural Context

Shallots have been used historically in Indian traditional medicine systems as food, ornamental plants, natural preservatives, and medicinals for various diseases. Both bulbs and leaves are consumed raw or cooked for their pungency and nutrient content, serving as vital food items in India.

## Synergistic Combinations

Garlic, Onion, Quercetin, Vitamin C, Turmeric

## Frequently Asked Questions

### What are the main antioxidant compounds in shallots?

Shallots are particularly rich in quercetin, kaempferol, and phenolic acids such as ferulic and caffeic acid, with total phenolic content measured up to several hundred mg gallic acid equivalents per gram dry weight. They also contain organosulfur compounds including alliin and propyl cysteine sulfoxide, which contribute additional free-radical scavenging capacity. These compounds collectively give shallots a higher antioxidant density than many common onion varieties in laboratory assays.

### Do shallots have anti-inflammatory properties?

Yes, shallots contain quercetin and organosulfur compounds that inhibit COX-2 and LOX enzymes, reducing the synthesis of prostaglandins and leukotrienes that drive inflammation. In vitro studies show shallot extracts can suppress NF-κB activation and reduce TNF-α and IL-6 production in immune cells. However, these effects have been demonstrated primarily in cell and animal models, and human clinical evidence specifically for shallots is currently lacking.

### How much vitamin C do shallots contain?

Fresh shallots contain approximately 3.68 to 8.79 mg of vitamin C per 100 grams fresh weight, which is relatively modest compared to high-vitamin-C foods like bell peppers (80–100 mg/100g). This amount can contribute to daily vitamin C intake but is unlikely to meet the full recommended dietary allowance (75–90 mg/day for adults) from shallots alone. Cooking reduces vitamin C content due to heat sensitivity, so raw consumption preserves more of this nutrient.

### Are shallots safe for people with IBS or digestive issues?

Shallots are classified as a high-FODMAP food due to their significant fructooligosaccharide (FOS) and fructan content, which can trigger bloating, gas, and abdominal pain in individuals with IBS or fructose malabsorption. The Monash University Low FODMAP Diet recommends avoiding or strictly limiting shallots during the elimination phase of an IBS dietary protocol. People with sensitive digestive systems may tolerate small amounts, but individual thresholds vary and should be assessed through dietary reintroduction testing.

### Can shallots interact with blood-thinning medications like warfarin?

Shallots contain quercetin and organosulfur compounds that inhibit platelet aggregation and may inhibit CYP3A4 and CYP2C9 liver enzymes responsible for metabolizing anticoagulants like warfarin, potentially increasing bleeding risk or altering drug plasma levels. At normal culinary quantities, this interaction is unlikely to be clinically significant for most people, but high-dose shallot or quercetin supplements could pose a meaningful risk. Patients prescribed warfarin, clopidogrel, or other anticoagulants should consult their healthcare provider before using concentrated allium supplements.

### What is the difference between fresh shallots and shallot supplements or extracts?

Fresh shallots provide whole-food nutrients including fiber, water-soluble vitamins, and minerals in their natural matrix, while extracts concentrate specific compounds like flavonoids and may lose volatile sulfur compounds during processing. Extract forms may offer higher concentrations of certain antioxidants but lack the synergistic effect of whole-food consumption and the prebiotic benefits of fresh shallot fiber. Fresh shallots contain approximately 3.68-8.79 mg of vitamin C per 100g, whereas extracts vary widely depending on processing methods and standardization.

### Are shallots safe to consume during pregnancy and breastfeeding?

Shallots are generally recognized as safe food ingredients during pregnancy and breastfeeding when consumed in normal culinary amounts as part of a balanced diet. However, pregnant women should avoid medicinal-dose supplements or extracts of shallots without consulting their healthcare provider, as high-dose supplementation has not been adequately studied in pregnancy. As with all dietary changes during pregnancy, moderation and consultation with a healthcare provider is recommended.

### How does the cooking method affect the antioxidant content and bioavailability of shallots?

Heat processing such as roasting, sautéing, or boiling can reduce heat-sensitive vitamin C content but may increase the bioavailability of certain phenolic compounds through cell wall breakdown. Raw shallots retain maximum vitamin C and volatile sulfur compounds (which may have antimicrobial properties), while cooked shallots may offer enhanced absorption of fat-soluble antioxidant compounds when prepared with oil. The optimal preparation method depends on whether the goal is preserving heat-sensitive nutrients or maximizing polyphenol bioavailability.

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