Quick Summary

Khella (Ammi visnaga) is a medicinal plant traditionally used in various cultures with purported antioxidant, anti-inflammatory, and vasodilatory properties. Scientific studies have examined its chemical composition, antioxidant potential, and proposed therapeutic roles. However, rigorous human clinical evidence is limited or pending. Some research highlights the antioxidant activity of its essential oil and potential multitarget effects in disease models. Currently, there is insufficient conclusive clinical data to fully endorse its traditional uses.

What is it?

Khella is a plant species known scientifically as Ammi visnaga. It belongs to the Apiaceae family and is native to the Mediterranean region. Historically, it has been used in traditional medicine systems for various health-related purposes, including vascular and inflammatory conditions.

Traditional Uses

  • Support for cardiovascular health, including use for arrhythmias
  • Alleviation of inflammation
  • Management of oral and dental health issues
  • Use as an antioxidant agent

Active Compounds

The plant contains a variety of phytochemicals, including khellin and visnagin, which are furanocoumarin derivatives. Essential oils extracted from Khella have shown antioxidant activities in laboratory studies.

Potential Benefits with Evidence Levels

  • Oxidative Stress Related Conditions: Khella shows moderate antioxidant activity in vitro and in vivo by increasing antioxidant enzymes and reducing lipid peroxidation.

    Evidence level: Preclinical (animal studies and in vitro assays)
    [Source]
  • Sepsis-associated Acute Kidney Injury: Protection against oxidative stress and ferroptosis was observed in animal models via multiple mechanisms attributed to visnagin, a component of Khella.

    Evidence level: Preclinical (murine and cell studies)
    [Source]
  • Cardiovascular Disorders including Arrhythmias: Traditional use and some preliminary antiarrhythmic effects have been noted; however, clinical evidence is lacking and further research is needed.

    Evidence level: Traditional use and limited clinical research; pending further studies
    [Source]
  • Oral and Dental Health: Herbal remedies related to Ammi visnaga demonstrate antimicrobial, anti-inflammatory, and antioxidant properties in reviews, although no direct clinical trials on Khella have been conducted.

    Evidence level: Review evidence, no direct clinical trials
    [Source]

Side Effects

Reported adverse effects related to Khella or its components (such as khellin) include:

  • Erythema (skin redness)
  • Perilesional hyperpigmentation
  • Gastrointestinal disturbances
  • Mild elevation of liver transaminases
  • Orthostatic complaints
  • Potential phototoxic reactions (inferred from related photosensitizing compounds in similar plants)

Drug Interactions

No specific drug interaction studies for Ammi visnaga have been identified. Due to lack of data and the potential for interactions common to herbal supplements, it is advisable to consult a healthcare professional before combining Khella with prescription medications or other supplements.

Who Should Avoid It

  • Individuals with known hypersensitivity to plants in the Apiaceae family
  • Persons with photosensitivity disorders, due to possible phototoxic effects
  • Pregnant or breastfeeding women should use Khella with caution or avoid it, given limited safety data
  • People at high risk for adverse reactions should exercise caution until more evidence is available

Evidence Limitations

  • Most data derive from preclinical studies (animal or in vitro) with limited or no robust human clinical trials
  • Safety data are often secondary outcomes, and adverse effects may be incompletely reported
  • Variability in herbal preparations and lack of standardization limits generalizability of findings
  • Possible contamination with heavy metals depending on the harvest source
  • Lack of specific drug interaction and pharmacokinetic human data
  • Traditional uses are primarily based on ethnobotanical knowledge without rigorous clinical evaluation

References

Last Reviewed

June 2024

Disclaimer: This page is for informational purposes only and does not constitute medical advice. The safety and efficacy of Khella (Ammi visnaga) have not been established by high-quality clinical trials. Always consult a qualified healthcare professional before starting any new herbal supplement, especially if you are pregnant, breastfeeding, have existing health conditions, or are taking other medications.