# Spring Onion (Allium fistulosum)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/spring-onion
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-24
**Evidence Score:** 2 / 10
**Category:** Vegetable
**Also Known As:** Allium fistulosum, Welsh onion, scallion, green onion, bunching onion, Japanese bunching onion, cibol, stone leek

## Overview

Spring onion (Allium fistulosum) contains sulfur compounds that modulate [glutathione](/ingredients/condition/detox) levels, achieving 0.497 nmol/mg protein in leaf tissues. These compounds demonstrate dose-dependent cellular activity with inhibitory effects at 0.8841 mg/mL concentrations in laboratory studies.

## Health Benefits

• [Antioxidant](/ingredients/condition/antioxidant) support through sulfur compounds and [glutathione](/ingredients/condition/detox) modulation (0.497 nmol/mg protein in leaves) - preliminary evidence from in vitro studies
• Potential cellular health benefits with dose-dependent inhibitory activity on human cells (BJ-IC50 0.8841 mg/mL) - preliminary in vitro evidence only
• [Anti-inflammatory](/ingredients/condition/inflammation) potential via β-sitosterol (6533.8 µg/100g) and other sterols - traditional use supported by phytochemical analysis
• Rich source of flavonoids (465.87 mg/g) including quercetin and kaempferol - compositional analysis only
• Traditional cytostatic properties attributed to sulfur compounds - historical use without clinical validation

## Mechanism of Action

Spring onion's sulfur compounds modulate [glutathione](/ingredients/condition/detox) synthesis pathways, enhancing cellular [antioxidant](/ingredients/condition/antioxidant) capacity through increased protein expression at 0.497 nmol/mg protein levels. The bioactive compounds interact with cellular membrane receptors and intracellular signaling cascades. These mechanisms contribute to dose-dependent inhibitory activity on human cell lines with IC50 values of 0.8841 mg/mL.

## Clinical Summary

Current evidence for spring onion comes primarily from in vitro laboratory studies rather than human clinical trials. Research has quantified [glutathione](/ingredients/condition/detox) levels at 0.497 nmol/mg protein in leaf tissues and cellular inhibitory activity at IC50 0.8841 mg/mL concentrations. The dose-dependent effects observed in cell culture studies suggest potential biological activity, but human studies are needed. Evidence remains preliminary and requires validation through controlled human trials with larger sample sizes.

## Nutritional Profile

Per 100g raw spring onion (Allium fistulosum): Energy ~34 kcal; Water ~89.8g; Protein ~1.8g; Total fat ~0.4g; Carbohydrates ~6.5g (including ~2.3g sugars); Dietary fiber ~2.6g. Vitamins: Vitamin C ~27 mg (moderate bioavailability, enhanced by co-consumption with iron-rich foods); Vitamin K1 (phylloquinone) ~207 µg (fat-soluble, bioavailability improved with dietary fat); Vitamin A as β-carotene ~1160 µg RAE equivalent (~598 µg retinol activity, variable conversion efficiency of 12:1 to 21:1); Folate (B9) ~64 µg; Riboflavin (B2) ~0.08 mg; Thiamin (B1) ~0.05 mg; Pyridoxine (B6) ~0.06 mg. Minerals: Potassium ~276 mg; Calcium ~72 mg (moderate bioavailability ~20-30%, partially limited by oxalates); Phosphorus ~37 mg; Magnesium ~20 mg; Iron ~1.5 mg (non-heme, ~5-12% bioavailability); Zinc ~0.39 mg; Manganese ~0.16 mg. Bioactive compounds: Organosulfur compounds including allyl sulfides (diallyl sulfide, diallyl disulfide, allyl methyl sulfide) responsible for characteristic flavor and [antioxidant activity](/ingredients/condition/antioxidant); Glutathione content ~0.497 nmol/mg protein in leaf tissue supporting [Phase II detox](/ingredients/condition/detox)ification enzyme modulation; Quercetin and quercetin glycosides (estimated 10-50 mg/100g in green portions, bioavailability ~2-5% but enhanced by fat co-ingestion and gut microbiota hydrolysis); Kaempferol glycosides (trace to ~5 mg/100g); Phytosterols notably β-sitosterol ~6533.8 µg/100g, campesterol, and stigmasterol (phytosterol bioavailability ~0.5-2%, competing with cholesterol absorption); Fructooligosaccharides (FOS) acting as [prebiotic](/ingredients/condition/gut-health) fiber supporting Bifidobacterium and Lactobacillus populations in the colon; Chlorophyll a and b in green portions (~15-30 mg/100g); Lutein and zeaxanthin (~1137 µg/100g, fat-soluble carotenoids with enhanced bioavailability when consumed with lipids). Green leaf portions contain significantly higher concentrations of vitamins A, C, K, and phenolic compounds compared to white sheath portions, which are richer in fructans and organosulfur precursors. Alliin (S-allyl-L-cysteine sulfoxide) is enzymatically converted to thiosulfinates by alliinase upon tissue disruption, with bioavailability of downstream metabolites being relatively high due to rapid absorption in the upper GI tract.

## Dosage & Preparation

No clinically studied dosage ranges are available as human trials are absent. Studies have quantified compounds in extracts (alliin 145 ± 15 µg/mL, allicin 20 ± 5 µg/mL) but do not specify therapeutic doses or standardization protocols. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Spring onion is generally recognized as safe when consumed as food, with minimal reported adverse effects in healthy individuals. Individuals taking anticoagulant medications should exercise caution due to potential interactions with sulfur compounds affecting blood clotting. Allergic reactions may occur in people sensitive to other Allium family vegetables like garlic or regular onions. Pregnancy and breastfeeding safety data is limited, though culinary consumption appears safe based on traditional use patterns.

## Scientific Research

Despite extensive phytochemical characterization, the research dossier reveals no human clinical trials, RCTs, or meta-analyses for Allium fistulosum. Evidence is limited to in vitro studies showing dose-dependent effects on human cells and compositional analyses of bioactive compounds.

## Historical & Cultural Context

Allium fistulosum has been used for centuries in traditional Asian (particularly Chinese) and European herbal practices for both culinary and medicinal purposes. Historical applications include use as an [antioxidant](/ingredients/condition/antioxidant), cytostatic, and [anti-inflammatory](/ingredients/condition/inflammation) remedy, with sulfur compounds considered responsible for these traditional effects.

## Synergistic Combinations

Garlic, Ginger, Turmeric, Quercetin, Vitamin C

## Frequently Asked Questions

### What compounds in spring onion provide antioxidant benefits?

Spring onion contains sulfur compounds that modulate glutathione levels, reaching concentrations of 0.497 nmol/mg protein in leaf tissues. These sulfur-containing bioactive compounds are responsible for the antioxidant activity observed in laboratory studies.

### How much spring onion is needed for health benefits?

Laboratory studies show cellular activity at concentrations of 0.8841 mg/mL, but human dosage recommendations are not established. Current evidence comes from in vitro studies rather than human trials, so optimal intake levels remain undetermined.

### Can spring onion interact with blood thinning medications?

Spring onion contains sulfur compounds that may potentially affect blood clotting mechanisms, similar to other Allium vegetables. Individuals taking anticoagulant medications like warfarin should consult healthcare providers before increasing spring onion consumption beyond normal culinary amounts.

### Is spring onion safe during pregnancy?

While spring onion has a long history of safe culinary use, specific safety data during pregnancy is limited. Normal food consumption appears safe based on traditional use, but concentrated supplements or medicinal amounts should be avoided without medical supervision.

### What's the difference between spring onion and regular onion benefits?

Spring onion (Allium fistulosum) contains similar sulfur compounds to regular onions but with different concentrations and bioactivity profiles. Laboratory studies show spring onion achieves 0.497 nmol/mg protein glutathione levels, though direct comparisons with regular onions require additional research.

### What is the bioavailability difference between fresh spring onion and cooked spring onion?

Fresh spring onion retains higher levels of heat-sensitive sulfur compounds and glutathione, which contribute to antioxidant activity, while cooking can reduce these volatile compounds but may increase the bioavailability of other beneficial constituents like β-sitosterol. Light cooking (steaming or quick sautéing) typically preserves more antioxidant compounds compared to prolonged boiling or high-heat methods. The optimal preparation depends on whether you prioritize heat-sensitive or heat-stable phytochemicals.

### How strong is the clinical evidence for spring onion's anti-inflammatory effects in humans?

Current evidence for spring onion's anti-inflammatory benefits is primarily based on preliminary in vitro studies and traditional use rather than robust human clinical trials. While spring onion contains β-sitosterol (6533.8 µg/100g) and other sterols with known anti-inflammatory properties, direct evidence of efficacy in humans remains limited. More controlled clinical studies are needed to establish safe, effective doses and confirm benefits in human populations.

### Who should prioritize spring onion consumption for cellular health support?

Individuals seeking dietary sources of antioxidants and anti-inflammatory compounds may benefit from regular spring onion consumption, though current evidence is preliminary and dose-dependent in vitro. Those unable to consume other allium vegetables (like garlic or regular onions) due to digestive sensitivities might find spring onion more tolerable while still obtaining sulfur compounds and glutathione-modulating benefits. However, clinical evidence in specific populations remains limited, so spring onion should be considered part of a varied nutrient-dense diet rather than a standalone therapeutic intervention.

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