FolkKB

onion

Allium cepa

Allium cepa is a plant species belonging to the Amaryllidaceae family used extensively in various global medicinal traditions. Historically, it has been applied as an expectorant, carminative, and diuretic to address conditions such as cough, bronchitis, catarrh, and edema. Scientific evidence regarding its therapeutic properties is limited and varied; while some studies suggest potential in reducing tumor burden in murine models or demonstrating antifungal activity in specific bacterial contexts, other research indicates significant cytotoxic and genotoxic effects on root meristems. No major safety issues or notable drug interactions have been recorded in the available data.

At a glance
Traditionally for
expectorant · tuberculosis
Traditions
Unani · traditional · TCM · Russian / post-Soviet
Best evidence
D
Cautions
—

Informational only. Traditional use does not mean proven effectiveness. Evidence and safety vary — check the cited sources.

Traditional use

  • expectorant Unani T3 DRDUKE
  • tuberculosis traditional T3 DRDUKE
  • bronchitis Unani T3 DRDUKE
  • carminative Unani T3 DRDUKE
  • catarrh TCM T3 DRDUKE
  • cold traditional T3 DRDUKE
  • diuretic Unani T3 DRDUKE
  • dropsy (edema) traditional T3 DRDUKE
  • vermifuge Unani T3 DRDUKE
  • warts Russian / post-Soviet T3 DRDUKE
  • abscess TCM T3 DRDUKE
  • aperitif Unani T3 DRDUKE
  • bacterial infections traditional T3 DRDUKE
  • chest complaints traditional T3 DRDUKE
  • cough traditional T3 DRDUKE

What the science says

  • Three Bacillus strains showed strong antifungal activity and promoted onion growth. D PMID
  • The study using nuclear phylogenomics found incomplete lineage sorting and evidence of gene flow among species within Allium, contributing to unresolved phylogenetic relationships. D PMID
  • The study found that chitosan-confined selenium-silver nanohybrids improved survival and reduced tumor burden in a murine model of hepatocellular carcinoma. D PMID
  • Shallots, while valuable for their health benefits and culinary uses, require careful postharvest handling to maintain quality and extend shelf life due to their perishable nature. D PMID
  • The study found that benzalkonium chloride induced significant cytotoxic and genotoxic effects in Allium cepa root meristems, with persistent damage even after transfer to distilled water. D PMID

Frequently asked questions

What is onion?

onion (Allium cepa) is a plant documented in FolkKB's traditional-medicine reference, drawn from sourced literature and cross-checked against the evidence.

What is onion traditionally used for?

Traditional sources record onion for: expectorant, tuberculosis, bronchitis, carminative, catarrh, cold. This reflects traditional use, not a proven medical treatment.

Which traditions use onion?

onion appears in these traditions in our sources: Unani, traditional, TCM, Russian / post-Soviet.

What does the scientific evidence say about onion?

5 sourced findings are recorded for onion; the strongest carries evidence grade D. For example: Three Bacillus strains showed strong antifungal activity and promoted onion growth.

How strong is the evidence for onion?

The strongest finding for onion carries evidence grade D — preliminary or traditional. Grades run A (strongest) to D (preliminary or traditional).

Is onion safe? What are the side effects?

No major safety issues are recorded for onion in our sources, but the data may be incomplete. Consult a qualified professional before use.

Does onion interact with medications?

No drug interactions are recorded for onion in our sources. This does not rule them out — check with a pharmacist.

What are the common names of onion?

onion is also known as: Лук репчатый, Oignon.

Is onion a proven treatment?

No. FolkKB is informational only. Traditional use and early findings are not proof of efficacy or safety — consult a qualified professional and never self-treat.

Sources

  1. T3 Dr. Duke's Ethnobotanical Database public domain (USDA ARS — attribute Dr. Duke's)
  2. T2 Properties of Bacillus sp. Strains with Antifungal and Plant Growth Promoting Activities. literature abstract metadata
  3. T2 Physiology, Nutrition, and Postharvest Technology on Shallots (Allium cepa L. aggregatum): A Review. literature abstract metadata
  4. T2 Cytotoxicity and genotoxicity of benzalkonium chloride in the Allium cepa root meristem test system and evaluation of recovery capacity. literature abstract metadata
  5. T2 Chitosan-confined selenium-silver nanohybrids enable redox-modulated mitochondrial apoptosis and survival improvement in experimental hepatocellular carcinoma. literature abstract metadata
  6. T2 Nuclear phylogenomic analysis of Allium (Amaryllidaceae) species from Kazakhstan reveals incomplete lineage sorting and gene flow. literature abstract metadata

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