Shallot (Allium ascalonicum): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How do shallots provide antioxidant benefits?

Shallots contain high levels of flavonoids, particularly quercetin and kaempferol, which neutralize free radicals by donating electrons to unstable molecules. This mechanism prevents oxidative damage to cells and tissues. Allicin, released when shallots are crushed or chopped, provides additional antimicrobial and cardiovascular effects. The combination of these bioactive compounds supports cellular health and may help reduce inflammation throughout the body. Evidence Level: C (preclinical studies).

Can shallots interact with blood thinning medications?

Yes, shallots may interact with anticoagulant medications like warfarin. Shallots contain compounds with mild blood-thinning properties that can enhance the effects of prescription blood thinners, potentially increasing bleeding risk. If you take anticoagulants, maintain consistent shallot intake and inform your healthcare provider. Avoid consuming large quantities before scheduled surgery. Evidence Level: C (theoretical based on constituent properties).

How many shallots should I eat daily for health benefits?

Traditional and culinary use suggests 2-4 shallots per day as a reasonable intake for general health benefits. This amount provides beneficial flavonoids like quercetin without causing significant side effects in most adults. Shallots can be consumed raw, cooked, or incorporated into meals. Higher intakes may cause gastrointestinal upset. There is no standardized clinical dosage established. Evidence Level: Traditional.

Is it safe to eat shallots during pregnancy?

Yes, shallots are considered safe to consume during pregnancy when eaten in normal culinary amounts. They provide beneficial nutrients and antioxidants without known risks to fetal development. Pregnant women should avoid excessive consumption, which may cause heartburn or digestive discomfort. As with any dietary change during pregnancy, consult your healthcare provider for personalized guidance. Evidence Level: Traditional use.

What are the medicinal benefits of shallots?

Shallots have been used in Persian, Southeast Asian, and European folk medicine for antimicrobial, antioxidant, and digestive support. They contain quercetin, kaempferol, fisetin, and allicin, which may promote cardiovascular health and immune function. Traditional applications include supporting circulation and treating minor infections. Modern research suggests potential benefits for blood sugar regulation, though clinical evidence remains limited. Evidence Level: C.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Shallot (Allium ascalonicum) is a traditional plant used globally for culinary purposes and as a folk remedy, demonstrating antioxidant, antimicrobial, and anti-inflammatory properties [PMID:35983491].

Background

Shallot (Allium ascalonicum L.) is a perennial plant of the Amaryllidaceae family [PMID:35983491, PMID:36009266]. It is classified within the Allium cepa Aggregatum group or as diploid/triploid viviparous onions (A. x proliferum and A. x cornutum) [PMID:36009266].

Traditional uses

Used worldwide as a folk remedy [PMID:35983491] and in Thai folklore for hair growth promotion [PMID:35684272]. In traditional Chinese medicine, shallot bulbs are used in Cong-Chi decoction to treat wind-cold-type common colds [PMID:38803435].

Active compounds

Major constituents include phenolic compounds such as quercetin, rosmarinic acid, and p-coumaric acids [PMID:35684272], as well as isorhamnetin and their glycosides [PMID:12236699]. Other identified components include furostanol saponins (ascalonicoside A1/A2 and B) [PMID:12236699], alkaloids, tannins, and terpenoids [PMID:40820276]. Essential oil contains hexadecanoic acid methyl ester and caryophyllene oxide [PMID:40820276].

Mechanism of action

Shallot extracts exhibit antioxidant activity via free radical scavenging [PMID:35983491, PMID:36331692]. In psoriasis models, plant-derived nanovesicles from shallot modulate the IL-17 signaling pathway and NRF2 pathway [PMID:40487455]. For common colds, it may act via the Nrf2/HO-1 pathway and modulation of Lactobacillus murinus [PMID:38803435]. It also demonstrates inhibitory activity against alpha-amylase, DPP-4, and PTP-1B [PMID:40820276].

Clinical evidence

Evidence BAllergic Rhinitis

Oral administration of 3g of shallot per day (approx. 1.5 bulbs) as an adjuvant to cetirizine was studied for therapeutic effects [PMID:31421664]

Evidence ACardiovascular diseases, diabetes, cancer prevention

Systematic review suggests shallot can be used as adjuvant therapy for these non-communicable diseases [PMID:35983491]

Evidence DPsoriasis

Topical application of shallot plant-derived nanovesicle hydrogels led to complete recovery of normal skin phenotype in murine models [PMID:40487455]

Evidence DCancer

Aqueous extracts showed anti-growth activity in vitro against Jurkat and K562 tumor cell lines [PMID:22291731] and anti-carcinogenic properties against breast cancer in silico and in vitro [PMID:36331692]

Evidence DDiabetes

Ethyl acetate fraction and essential oil demonstrated potent inhibitory activity against alpha-amylase, DPP-4, and PTP-1B in vitro [PMID:40820276]

Safety & adverse effects

In vitro studies indicate that aqueous extracts show significantly less cytotoxicity against normal cell lines (HUVEC) compared to tumor cell lines [PMID:22291731].

Evidence summary

Evidence is primarily based on in vitro, in silico, and animal models (Level D), with one systematic review (Level A) and one small randomized controlled trial (Level B) providing higher-level evidence for its potential therapeutic applications.

PubMed sources

1.PMID: 35983491 (2022) — Therapeutic Uses and Pharmacological Properties of Shallot (Allium ascalonicum): A Systematic Review. · Frontiers in nutrition
2.PMID: 35684272 (2022) — Phytochemical Constitution, Anti-Inflammation, Anti-Androgen, and Hair Growth-Promoting Potential of Shallot (Allium ascalonicum L.) Extract. · Plants (Basel, Switzerland)
3.PMID: 31421664 (2022) — Antiallergic activities of shallot (Allium ascalonicum L.) and its therapeutic effects in allergic rhinitis. · Asian Pacific journal of allergy and immunology
4.PMID: 22291731 (2011) — Anticancer and anti-inflammatory activities of shallot (Allium ascalonicum) extract. · Archives of medical science : AMS
5.PMID: 12236699 (2002) — Chemical composition of shallot (Allium ascalonicum Hort.).

Shallot

Sources & Citations

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