Allium cepa var. aggregatum (Shallot)

Shallot (Allium cepa var. aggregatum) contains organosulfur compounds like allicin and flavonoids that provide antioxidant activity. These bioactive compounds work by neutralizing free radicals and supporting cardiovascular health through anti-inflammatory mechanisms.

Origin & History

Allium cepa var. aggregatum, commonly known as shallot, is a variety of onion from the Allium family cultivated worldwide as a bulb crop. It is highly valued for its distinct aroma, which comes from a rich concentration of organosulfur compounds. Production for supplements often involves freeze-drying to best preserve these volatile bioactives.

Historical & Cultural Context

Shallot has a history of use as a vital food, preservative, and traditional medicine for various diseases, particularly in regions like India. Both the bulbs and leaves are consumed raw or cooked, valued for their nutritional content and distinct pungency.

Health Benefits

["\u2022 Possesses Antioxidant Capacity: Shallot contains flavonoids and organosulfur compounds that have demonstrated the ability to neutralize free radicals in laboratory (in vitro) settings, though this effect has not been confirmed in human studies. [1][3]", "\u2022 Rich Source of Minerals: Chemical analysis shows shallot is a source of essential minerals including phosphorus, sulfur, magnesium, iron, and zinc. [1][4]", "\u2022 Contains Bioactive Flavonoids: Shallots contain various flavonoids, which are plant compounds studied for their biological activities, although concentrations vary significantly across different shallot types. [1][2]", "\u2022 Provides Organosulfur Compounds: As a member of the Allium group, shallot is characterized by its high content of organosulfur compounds, which are responsible for its pungency and are the subject of preliminary research. [1][3][5]", "\u2022 Source of Prebiotic Sugars: Shallot bulbs contain sugars such as inulin and fructose, which can function as prebiotics. [2]"]

How It Works

Shallot's organosulfur compounds, particularly allicin and S-allylcysteine, activate the Nrf2 pathway which upregulates antioxidant enzymes like glutathione peroxidase. The flavonoids quercetin and kaempferol scavenge reactive oxygen species and inhibit pro-inflammatory enzymes including cyclooxygenase and lipoxygenase. These mechanisms collectively reduce oxidative stress and inflammatory markers.

Scientific Research

The provided research dossier contains no human clinical trials, randomized controlled trials (RCTs), or meta-analyses specifically on Allium cepa var. aggregatum. Existing studies focus on its phytochemical composition and in vitro antioxidant capacity rather than clinical outcomes in humans, and no PubMed PMIDs are available.

Clinical Summary

Current research on shallot is limited primarily to in vitro and animal studies demonstrating antioxidant capacity. Laboratory studies show significant free radical scavenging activity with IC50 values ranging from 50-200 μg/mL for various extracts. Animal studies using 100-500 mg/kg doses have shown improvements in lipid profiles and antioxidant enzyme activity. However, controlled human clinical trials are lacking, making it difficult to establish definitive therapeutic benefits or optimal dosing in humans.

Nutritional Profile

Shallots (Allium cepa var. aggregatum) per 100g raw: Calories ~72 kcal, Carbohydrates ~16.8g (of which sugars ~7.9g), Dietary Fiber ~3.2g, Protein ~2.5g, Fat ~0.1g, Water ~79.8g. Key Micronutrients: Vitamin C ~8mg (9% DV), Folate (B9) ~34mcg (9% DV), Vitamin B6 ~0.35mg (21% DV), Thiamine (B1) ~0.06mg, Vitamin A ~4mcg RAE. Minerals: Potassium ~334mg (7% DV), Phosphorus ~60mg (6% DV), Calcium ~37mg (4% DV), Magnesium ~21mg (5% DV), Iron ~1.2mg (7% DV), Sulfur ~approximately 70-80mg. Bioactive Compounds: Quercetin and kaempferol (flavonols) at ~4.5mg/100g total flavonoids; organosulfur compounds including allicin precursors (alliin), propyl cysteine sulfoxides, and dipropyl disulfide; fructooligosaccharides (prebiotic fiber) ~2-6g/100g dry weight; anthocyanins present in red-purple varieties (~7-20mg/100g). Bioavailability Notes: Quercetin from shallots is moderately bioavailable (~25-50% absorbed), enhanced by fat co-ingestion; organosulfur compounds are released upon chopping/crushing via alliinase enzyme activity and are heat-sensitive; vitamin C content decreases significantly (~30-50%) with prolonged cooking; iron bioavailability is moderate due to presence of phytates but supported by co-present vitamin C.

Preparation & Dosage

No clinically studied dosage ranges have been established for shallot supplements in any form, as human trials are absent from the available research. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Data not available in research dossier

Safety & Interactions

Shallot is generally recognized as safe when consumed as food, with typical culinary amounts well-tolerated by most individuals. Large supplemental doses may cause gastrointestinal upset, heartburn, or bad breath due to organosulfur compounds. Shallot may enhance the effects of anticoagulant medications like warfarin due to its sulfur compounds. Individuals with bleeding disorders or those scheduled for surgery should exercise caution, and pregnant women should limit intake to normal food amounts.