Hermetica Superfood Encyclopedia
The Short Answer
Kei apple (Dovyalis caffra) contains chlorogenic acid at 2107.96 µg/g and catechin at 168 µg/g, which provide antioxidant activity through DPPH scavenging with an IC50 of 728.20 µg/mL. The fruit's methanolic extracts demonstrate antimicrobial effects against E. coli and antiviral activity against human coronavirus 229E in laboratory studies.
CategoryFruit
GroupFruit
Evidence LevelStrong
Primary KeywordKei Apple benefits
Synergy Pairings4
Health Benefits
Supports immune health, collagen synthesis, and skin repair with its rich Vitamin C content.
Aids digestion and promotes gut balance due to its high fiber content
Reduces inflammation through its beneficial flavonoids and polyphenols
Protects cells from oxidative damage with its potent antioxidant support
Aids fluid balance and refreshes the body due to its high water content
Origin & History
Kei Apple (Dovyalis caffra) is a hardy fruit native to southern Africa, thriving in subtropical climates along riverbanks and savannas. Known for its drought resistance and ability to grow in poor soils, it is valued both culinarily and medicinally for its tart, juicy pulp and rich nutrient profile.
“Kei Apple has been used for generations in southern African folk medicine to enhance immunity, support digestion, and reduce inflammation. It is seen as a symbol of resilience and health in dry environments where hydration and nutrition are paramount.”Traditional Medicine
Scientific Research
While Kei Apple has a long history of traditional use, scientific studies specifically detailing its mechanisms and efficacy are emerging. Preliminary research supports its antioxidant and anti-inflammatory potential, warranting further investigation.
Preparation & Dosage
Traditional Use
Consumed fresh or mixed with honey in traditional remedies for digestion and immune support.
Modern Forms
Found in supplements, juices, jams, and skincare formulations.
Recommended Dosage
200–400 mg extract daily
1/4–1/2 cup fresh fruit or .
Nutritional Profile
- Dietary Fiber
- Natural Sugars
- Vitamin C
- Calcium, Potassium
- Flavonoids, Polyphenols
How It Works
Mechanism of Action
Kei apple's primary bioactive compound chlorogenic acid (2107.96 µg/g) scavenges free radicals through DPPH inhibition, while catechin (168 µg/g) and gallic acid contribute to cellular antioxidant defense. The fruit's furan derivatives and levoglucosenone induce cytotoxic effects on cancer cells by causing cell shrinkage, vacuole formation, and loss of cellular adhesion. Antimicrobial activity occurs through furan compounds that disrupt bacterial cell walls, creating inhibition zones of 13-24 mm against gram-negative bacteria.
Clinical Evidence
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 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.
Safety & Interactions
No documented safety data, drug interactions, or contraindications exist for kei apple in current literature. Laboratory studies showing 58.90% cytotoxicity against liver cells at high concentrations (1000 µg/mL) suggest potential toxicity risks that have not been evaluated in human subjects. Pregnant and breastfeeding women should avoid kei apple supplements due to lack of safety data. Individuals taking medications or with existing health conditions should consult healthcare providers before use given the absence of interaction studies.
Synergy Stack
Hermetica Formulation Heuristic
Polyphenol/antioxidant base
Gut & Microbiome | Immune & Inflammation
Also Known As
Dovyalis caffraAberia caffraUmkokolaWild apricot
Frequently Asked Questions
What are the main active compounds in kei apple?
Kei apple contains chlorogenic acid as the primary compound at 2107.96 µg/g, followed by catechin at 168 µg/g and gallic acid at 15.66 µg/g. Additional bioactive compounds include furan derivatives, levoglucosenone, and the sesquiterpene lactone isochiapin B.
How strong is kei apple's antioxidant activity?
Kei apple demonstrates moderate antioxidant activity with 79.25% DPPH scavenging at 2000 µg/mL concentration and an IC50 value of 728.20 µg/mL. This antioxidant capacity is attributed primarily to its polyphenol content including chlorogenic acid and catechin.
Does kei apple have antimicrobial properties?
Yes, kei apple methanolic extracts show antimicrobial activity against several bacteria, with strongest effects against E. coli and P. vulgaris creating inhibition zones of 13-24 mm. The antimicrobial effects are less pronounced against gram-positive bacteria like S. aureus and B. subtilis.
Is kei apple safe for human consumption?
Safety data for kei apple is lacking, with no human studies available to establish safe dosage ranges or potential side effects. Laboratory studies showing cytotoxicity at high concentrations suggest caution is warranted until proper safety evaluations are conducted.
What cancer research exists for kei apple?
Preliminary in vitro studies show kei apple extracts cause 58.90% toxicity to HepG2 liver cancer cells at 1000 µg/mL concentration. The anticancer effects involve morphological changes including cell shrinkage and loss of adhesion, but human clinical trials are needed to validate therapeutic potential.
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