# Khella (Ammi visnaga)

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/khella
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-19
**Evidence Score:** 6 / 10
**Category:** Middle Eastern
**Also Known As:** Ammi visnaga, Bishop's weed, Toothpick weed, Visnaga, Khellal, Picktoothgrass, Greater ammi

## Overview

Khella (Ammi visnaga) contains furochromone compounds like khellin and visnagin, which primarily act as smooth muscle relaxants. These compounds contribute to its traditional use in supporting respiratory and urinary tract health.

## Health Benefits

• Potential [antioxidant activity](/ingredients/condition/antioxidant) (preliminary evidence from in vitro methanol extract studies only)
• Possible antibacterial properties (preliminary evidence from in vitro studies, no human trials)
• May support cellular health (in vitro studies showed cell viability maintained with 6-hour exposure to aqueous extract)
• Traditional use for unspecified conditions in Middle Eastern medicine (no clinical validation)
• Contains bioactive furanochromones khellin and visnagin (2.88mg and 1.72mg per 100mg aqueous extract respectively, clinical significance unknown)

## Mechanism of Action

Khella's primary active compounds, khellin and visnagin, are furochromones that induce smooth [muscle relaxation](/ingredients/condition/sleep). Khellin achieves this by inhibiting phosphodiesterase enzymes, leading to increased intracellular cyclic AMP (cAMP) levels, which in turn relaxes bronchial and vascular smooth muscle cells. Visnagin also exhibits vasodilatory effects, contributing to its traditional use in supporting [cardiovascular](/ingredients/condition/heart-health) and urinary health.

## Clinical Summary

Research on Khella (Ammi visnaga) primarily involves in vitro and preliminary studies, not human clinical trials. In vitro studies suggest potential [antioxidant activity](/ingredients/condition/antioxidant) from methanol extracts and possible antibacterial properties, without specific quantified outcomes. Other in vitro investigations indicated cellular health support by maintaining cell viability with 6-hour exposure. Human evidence for its traditional uses in conditions like kidney stones or asthma is largely observational or from older, less rigorous studies.

## Nutritional Profile

{"macronutrients": {"fiber": "Not well-documented", "protein": "Not well-documented"}, "micronutrients": {"vitamins": {"Vitamin C": "Trace amounts, exact concentration not well-documented"}, "minerals": {"Calcium": "Trace amounts, exact concentration not well-documented", "Magnesium": "Trace amounts, exact concentration not well-documented"}}, "bioactive_compounds": {"Khellin": "Approximately 0.3-1.0% of the plant material", "Visnagin": "Approximately 0.1-0.5% of the plant material"}, "bioavailability_notes": "Bioactive compounds such as khellin and visnagin are more effectively extracted in alcohol-based solutions. The bioavailability of vitamins and minerals is not well-studied."}

## Dosage & Preparation

No clinically studied dosage ranges exist. Traditional preparation uses 20g ground fruits infused in 200mL boiling water for 5 minutes, yielding approximately 2.88mg khellin and 1.72mg visnagin per 100mg of freeze-dried extract. Consult a healthcare provider before starting any new supplement.

## Safety & Drug Interactions

Khella can cause side effects including nausea, dizziness, [insomnia](/ingredients/condition/sleep), and liver toxicity at high doses, particularly with prolonged use. Photosensitivity is a potential concern due to other furanocoumarins in the plant, though less common with isolated khellin/visnagin. It may interact with anticoagulant medications due to potential blood-thinning effects. Pregnant and breastfeeding women, and individuals with liver disease, should avoid Khella.

## Scientific Research

No human clinical trials, RCTs, or meta-analyses were identified for Ammi visnaga in the available research. All evidence comes from in vitro cell viability assays using LDH release measurements and preliminary [antioxidant](/ingredients/condition/antioxidant)/antibacterial screening of methanol extracts, with no PMIDs for human studies provided.

## Historical & Cultural Context

Khella has historical use in Middle Eastern and North African traditional medicine, typically prepared as a tea infusion from the fruits. Modern analyses reference its longstanding traditional preparation methods, though specific therapeutic applications and duration of use are not detailed in available research.

## Synergistic Combinations

Other traditional Mediterranean herbs, [antioxidant](/ingredients/condition/antioxidant) compounds, herbs from Apiaceae family, traditional Unani medicine herbs

## Frequently Asked Questions

### What are the main active compounds in Khella?

Khella (Ammi visnaga) contains furochromone derivatives, primarily khellin and visnagin. These compounds are responsible for many of the plant's traditional medicinal properties, particularly its smooth muscle relaxant effects.

### How does Khella traditionally support smooth muscle relaxation?

Traditionally, Khella has been used as a smooth muscle relaxant. Khellin, a key compound, inhibits phosphodiesterase, increasing cAMP and thus relaxing muscles in the bronchi and urinary tract, aiding conditions like asthma or kidney stones.

### Is there scientific evidence for Khella's antioxidant properties?

Preliminary in vitro studies using methanol extracts of Khella have indicated potential antioxidant activity. However, this evidence is limited to laboratory settings and has not been confirmed in human trials.

### What are the known side effects and safety concerns of Khella?

Khella can cause side effects such as nausea, dizziness, and insomnia. High doses may lead to liver toxicity, and some individuals might experience photosensitivity. It should be avoided by pregnant/breastfeeding women and those with liver conditions.

### Can Khella interact with other medications?

Yes, Khella may interact with certain medications. Specifically, it could potentiate the effects of anticoagulant drugs, increasing the risk of bleeding. Consult a healthcare professional before combining Khella with any medication.

### What is the difference between Khella extract and whole herb preparations?

Khella extracts concentrate the active compounds like khellin and visnagin, potentially offering more standardized dosing compared to whole herb preparations. However, most clinical evidence and traditional use data come from whole herb or aqueous preparations rather than isolated extracts, making the comparative efficacy between forms unclear. Extract forms may have better bioavailability but may also increase the risk of side effects due to higher compound concentrations.

### Who should avoid taking Khella supplements?

Pregnant and nursing women should avoid Khella due to insufficient safety data in these populations. Individuals with photosensitivity, kidney disease, or those taking immunosuppressant medications should consult a healthcare provider before use, as Khella may increase photosensitivity risk and has not been adequately studied in these conditions. People with documented allergies to plants in the Apiaceae family should also avoid Khella.

### How strong is the scientific evidence supporting Khella's health benefits?

Evidence for Khella is primarily preliminary, based largely on in vitro (test tube) studies and traditional use rather than robust human clinical trials. While traditional Middle Eastern medicine has used Khella for centuries, most modern research focuses on isolated compounds like khellin rather than the whole herb, and larger, well-designed human studies are needed to confirm efficacy. The antioxidant and antibacterial properties shown in laboratory settings have not been consistently validated in human subjects.

---

*Source: Hermetica Superfoods Ingredient Encyclopedia — https://ingredients.hermeticasuperfoods.com*
*License: CC BY-NC-SA 4.0 — Attribution required. Commercial use: admin@hermeticasuperfoods.com*