# Kei Apple

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/kei-apple
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-15
**Evidence Score:** 4 / 10
**Category:** Fruit
**Also Known As:** Dovyalis caffra, Aberia caffra, Umkokola, Wild apricot

## Overview

Kei apple (Dovyalis caffra) is rich in chlorogenic acid (2107.96 µg/g) and catechin (168 µg/g), whose synergistic [antioxidant activity](/ingredients/condition/antioxidant) yields a DPPH IC50 of 728.20 µg/mL, while its methanolic extracts demonstrate significant anticancer, antimicrobial, and antiviral properties (PMID 35396383). A comprehensive ethnobotanical review confirms traditional use across southern Africa for [immune support](/ingredients/condition/immune-support), [digestive health](/ingredients/condition/gut-health), and infection management, with emerging pharmacological evidence validating these applications (PMID 31132461).

## Health Benefits

- **Supports immune health,**: [collagen synthesis](/ingredients/condition/skin-health), and skin repair with its rich Vitamin C content.
- **Aids [digestion](/ingredients/condition/gut-health) and**: promotes gut balance due to its high fiber content.
- **Reduces [inflammation](/ingredients/condition/inflammation) through**: its beneficial flavonoids and polyphenols.
- **Protects cells from**: oxidative damage with its potent [antioxidant](/ingredients/condition/antioxidant) support.
- **Aids fluid balance**: and refreshes the body due to its high water content.

## Mechanism of Action

Chlorogenic acid, the dominant phenolic compound in Kei apple at 2107.96 µg/g, exerts antioxidant effects by donating hydrogen atoms to neutralize DPPH and ABTS free radicals, while also inhibiting NF-κB-mediated [pro-inflammatory cytokine](/ingredients/condition/inflammation) transcription. Catechin (168 µg/g) and gallic acid complement this activity by chelating transition metal ions and scavenging [reactive oxygen species](/ingredients/condition/antioxidant) (ROS), thereby protecting cellular lipids, proteins, and DNA from oxidative damage. GC-MS analysis of Kei apple extracts identified furan derivatives and levoglucosenone, which have been shown to induce apoptosis in cancer cells through [mitochondrial](/ingredients/condition/energy) membrane depolarization and caspase cascade activation (PMID 35396383). Additionally, the fruit's phenolic constituents may modulate intestinal P-glycoprotein and tight junction permeability, as suggested by altered cimetidine transport in Caco-2 models (PMID 22085278).

## Clinical Summary

Current evidence for kei apple is limited to in vitro laboratory studies with no human clinical trials available. Research demonstrates 79.25% DPPH scavenging activity at 2000 µg/mL and 58.90% cytotoxicity against HepG2 liver cancer cells at 1000 µg/mL concentration. [Antimicrobial](/ingredients/condition/immune-support) testing shows strongest activity against E. coli and P. vulgaris with inhibition zones of 13-24 mm using disc diffusion methods. The preliminary nature of this research warrants caution in extrapolating benefits to human applications without further clinical validation.

## Nutritional Profile

- Dietary Fiber
- Natural Sugars
- Vitamin C
- Calcium, Potassium
- Flavonoids, Polyphenols

## Dosage & Preparation

- Traditional Use: Consumed fresh or mixed with honey in traditional remedies for [digestion](/ingredients/condition/gut-health) and [immune support](/ingredients/condition/immune-support).
- Modern Forms: Found in supplements, juices, jams, and skincare formulations.
- Recommended Dosage: 1/4–1/2 cup fresh fruit or 200–400 mg extract daily.

## Safety & Drug Interactions

Tarirai et al. (2012, PMID 22085278) demonstrated that Kei apple fruit extracts can alter the in vitro intestinal transport of cimetidine (a histamine H2-receptor antagonist) in both Caco-2 cell monolayers and porcine jejunum tissue, suggesting potential fruit–drug interactions affecting oral drug bioavailability. Individuals taking medications with narrow therapeutic indices or drugs transported by P-glycoprotein should exercise caution and consult a healthcare provider before consuming Kei apple in concentrated or supplemental forms. The fruit's high organic acid content may also exacerbate gastroesophageal reflux in sensitive individuals. No specific CYP450 enzyme interaction data have been published for Dovyalis caffra to date, but the significant chlorogenic acid content warrants monitoring given chlorogenic acid's documented inhibition of CYP3A4 in other plant systems.

## Scientific Research

Qanash et al. (2022) in Scientific Reports (PMID 35396383) demonstrated that Kei apple methanolic fruit extracts exhibit anticancer activity against multiple cell lines, [antioxidant](/ingredients/condition/antioxidant) capacity via DPPH scavenging (IC50 728.20 µg/mL), [antimicrobial](/ingredients/condition/immune-support) effects against E. coli and S. aureus, and antiviral activity against human adenovirus type 5. Aremu et al. (2019) in the Journal of Ethnopharmacology (PMID 31132461) provided a comprehensive review of ethnobotanical uses, biological activities, and phytochemical constituents of Dovyalis caffra across southern Africa, confirming its rich profile of phenolics, flavonoids, and organic acids. Tarirai et al. (2012) in Pharmaceutical Biology (PMID 22085278) evaluated the effects of Kei apple and other dietary fruits on cimetidine transport using Caco-2 cell and porcine jejunum models, revealing potential fruit–drug interactions that may alter intestinal drug absorption. Together, these studies establish a growing evidence base supporting Kei apple's pharmacological relevance beyond traditional folk medicine.

## Historical & Cultural Context

Kei Apple has been used for generations in southern African folk medicine to enhance [immunity](/ingredients/condition/immune-support), support [digestion](/ingredients/condition/gut-health), and reduce [inflammation](/ingredients/condition/inflammation). It is seen as a symbol of resilience and health in dry environments where hydration and nutrition are paramount.

## Synergistic Combinations

Role: Polyphenol/[antioxidant](/ingredients/condition/antioxidant) base
Intention: Gut & [Microbiome](/ingredients/condition/gut-health) | Immune & [Inflammation](/ingredients/condition/inflammation)
Primary Pairings: - Turmeric (Curcuma longa)
- Camu Camu (Myrciaria dubia)
- Ginger (Zingiber officinale)
- Maca Root (Lepidium meyenii)

## Frequently Asked Questions

### What are the main health benefits of Kei apple?

Kei apple benefits include potent antioxidant protection from chlorogenic acid (2107.96 µg/g) and catechin (168 µg/g), antimicrobial activity against E. coli and S. aureus, antiviral effects against human adenovirus, and anticancer properties demonstrated in vitro (PMID 35396383). The fruit is also rich in vitamin C, supporting immune function, collagen synthesis, and skin repair.

### Is Kei apple safe to eat and are there any side effects?

Kei apple is generally safe when consumed as a whole fruit in normal dietary amounts. However, research shows its extracts can alter intestinal drug transport of cimetidine (PMID 22085278), so individuals on prescription medications should consult a healthcare provider. Its high acidity may cause discomfort in those with acid reflux.

### What nutrients and bioactive compounds are found in Kei apple?

Kei apple contains significant levels of chlorogenic acid (2107.96 µg/g), catechin (168 µg/g), gallic acid, vitamin C, dietary fiber, and water. GC-MS analysis also identified furan derivatives and levoglucosenone with potential anticancer activity (PMID 35396383). The fruit's ethnobotanical profile includes organic acids, flavonoids, and multiple phenolic compounds (PMID 31132461).

### Does Kei apple have anticancer properties?

In vitro studies by Qanash et al. (2022, PMID 35396383) demonstrated that Kei apple methanolic extracts exhibit cytotoxic effects against cancer cell lines. The anticancer mechanism is attributed to furan derivatives and levoglucosenone identified via GC-MS, which may induce apoptosis through mitochondrial pathways. However, clinical trials in humans have not yet been conducted.

### How is Kei apple traditionally used in southern Africa?

According to Aremu et al. (2019, PMID 31132461), Kei apple has extensive ethnobotanical uses across southern Africa including consumption as a fresh fruit, preparation of jams and jellies, and traditional medicinal applications for infections, digestive ailments, and general wellness. The thorny shrub is also widely used as a natural hedge and livestock barrier, making it both a food and utilitarian plant.

### Can I get enough vitamin C and antioxidants from eating Kei apples instead of taking supplements?

Yes, Kei apples are an excellent whole-food source of vitamin C and antioxidants, providing both the nutrient and its supporting bioactive compounds like flavonoids and polyphenols in their natural matrix. One medium Kei apple can contribute significantly to daily vitamin C intake, though exact amounts vary by fruit size and ripeness. For optimal immune and skin health benefits, regular consumption of Kei apples can reduce or eliminate the need for separate vitamin C supplementation. However, supplementation may still be beneficial for those unable to access fresh Kei apples or requiring higher therapeutic doses.

### Is Kei apple safe for children, and can it help support their digestive and immune health?

Kei apples are generally safe for children and can be beneficial for their developing immune systems due to their high vitamin C content and gentle, fruit-based fiber for digestive support. The natural sweetness and low toxicity profile make them suitable for most children without age-related restrictions. However, whole fruits should be introduced age-appropriately to avoid choking risks in very young children, and parents should monitor for individual sensitivities. As with all new foods, introduce Kei apples gradually to ensure good tolerance.

### How does Kei apple compare to other high-vitamin C fruits like oranges or acerola for immune support?

Kei apple delivers comparable vitamin C levels to oranges while also providing unique flavonoid and polyphenol profiles that enhance its overall antioxidant and anti-inflammatory benefits beyond basic immune support. Unlike acerola, which is significantly higher in vitamin C but less accessible globally, Kei apples offer a more balanced nutrient profile with substantial fiber for digestive health. Kei apples are particularly valued in southern African traditional medicine for their synergistic combination of immune, skin, and digestive benefits rather than isolated nutrient density. The choice between these fruits depends on availability, personal preference, and whether comprehensive inflammatory support or maximum vitamin C concentration is the priority.

## References

Aremu AO et al. (2019). Ethnobotanical uses, biological activities and chemical properties of Kei-apple [Dovyalis caffra (Hook.f. & Harv.) Sim]: An indigenous fruit tree of southern Africa. Journal of Ethnopharmacology. PMID: 31132461 | Qanash H et al. (2022). Anticancer, antioxidant, antiviral and antimicrobial activities of Kei Apple (Dovyalis caffra) fruit. Scientific Reports. PMID: 35396383 | Tarirai C et al. (2012). Effects of dietary fruits, vegetables and a herbal tea on the in vitro transport of cimetidine: comparing the Caco-2 model with porcine jejunum tissue. Pharmaceutical Biology. PMID: 22085278

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