Carissa macrocarpa (Carissa macrocarpa): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Carissa macrocarpa work as a cardiac tonic?

Carissa macrocarpa contains trace amounts of cardiac glycosides and compounds like carissone. These constituents are believed to influence heart function by potentially strengthening cardiac contractions, though this is based on phytochemical analysis rather than clinical trials (Evidence Level C). The presence of flavonoids and tannins contributes to antimicrobial properties, supporting its traditional use for infections. The glycosides likely inhibit sodium-potassium ATPase, a mechanism similar to pharmaceutical cardiac drugs, but rigorous human studies are lacking.

Can I take Carissa macrocarpa with heart medication?

Caution is strongly advised when combining Carissa macrocarpa with heart medications. Because the plant contains trace cardiac glycosides, taking it alongside pharmaceutical heart drugs like digoxin could potentiate effects, leading to arrhythmias or toxicity (Evidence Level C/D). It may also interact with blood pressure medications. Always consult a qualified healthcare provider before combining herbal remedies with prescription cardiac drugs to avoid adverse interactions.

What is the recommended dosage for Carissa macrocarpa bark?

Traditional usage suggests a bark decoction of 5 to 10 grams taken twice daily (Evidence Level C/Traditional). This preparation is typically used for its cardiac tonic properties or to address infections. The fruit is consumed freely as food. However, due to the presence of cardiac glycosides, precise dosing is critical to avoid toxicity. Self-medication is discouraged without professional guidance, especially regarding root preparations which have higher concentrations of active compounds.

Is Carissa macrocarpa safe during pregnancy?

No, Carissa macrocarpa is considered unsafe during pregnancy. The roots and bark contain cardiac glycosides and other uterine stimulants that may cause miscarriage or harm fetal development (Evidence Level C/Traditional). While the ripe fruit is generally considered edible and nutritious, medicinal preparations using the bark or root should be strictly avoided by pregnant or breastfeeding women. Always err on the side of caution and consult a medical professional.

What are the traditional uses of Carissa macrocarpa?

In Zulu traditional medicine, Carissa macrocarpa is primarily used as a cardiac tonic and to treat various infections. The bark and roots are prepared to address heart conditions, while the plant's antimicrobial properties make it useful for skin conditions and wound healing (Evidence Level C). The fruit, known as the Natal plum, is a nutritious food source rich in Vitamin C. Despite these traditional applications, scientific validation remains limited.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 22 PubMed articles · model: gemma4:31b

Summary

Carissa macrocarpa, also known as Natal plum or Amatungula, is an edible plant indigenous to South Africa rich in bioactive phenolic compounds and anthocyanins [PMID:32260360, PMID:34207411].

Background

Carissa macrocarpa (Apocynaceae) is a woody shrub found in subtropical savannas of South Africa and has also been recorded in Tunisia [PMID:42256167, PMID:33473704, PMID:39942880].

Traditional uses

The fruits are widely consumed in African countries for the preparation of traditional foodstuff and for their beneficial health effects [PMID:30478775].

Active compounds

The plant contains anthocyanins, specifically cyanidin 3-O-β-sambubioside and cyanidin 3-O-glucoside [PMID:36076736, PMID:34207411]. Other identified compounds include flavonoid glycosides (derivatives of kaempferol, quercetin, and isorhamnetin), ellagic acid, catechin, epicatechin, apigenin, luteolin, and various essential oils such as pentadecanal and (E)-nerolidol [PMID:42114831, PMID:34207411, PMID:32260360, PMID:29907990].

Mechanism of action

Leaf extracts have demonstrated the ability to modulate p53 expression in colorectal cancer cell lines [PMID:42114831]. Flavan-3-ol derivatives from the leaves show strong binding affinity with TACE enzymes, contributing to neuroprotective activity [PMID:34959705]. Additionally, extracts have shown the ability to inhibit acetylcholinesterase and tyrosinase [PMID:41986532].

Clinical evidence

Evidence DColorectal Cancer (In Vitro)

Total leaf extract showed potent cytotoxicity against LS174T cells (IC50 = 0.5 μg/mL), inducing apoptosis and G1/S/G2 cell cycle arrest [PMID:42114831]

Evidence DLung Adenocarcinoma (In Vitro)

The MeOH fraction of leaf extract exhibited higher cytotoxic activity (IC50 1.57 ± 0.04 μg/mL) against A549 cells than etoposide [PMID:36559012]

Evidence DDoxorubicin-Induced Neurotoxicity (In Vivo)

Polar fraction of leaf hydromethanolic extract ameliorated cognitive dysfunction, reduced serum ROS and brain TNF-α levels, and upregulated brain nerve growth factor (NGF) in rats [PMID:34959705]

Evidence DCutaneous Leishmaniasis (In Vitro)

The EtOAc fraction of leaf extract showed strong growth inhibitory effects against Leishmania major promastigotes (IC50 27.52 ± 0.7 μg/mL) [PMID:36559012]

Evidence DBacterial/Fungal Infections (In Vitro)

Leaf extracts showed bactericidal effects against E. coli, while stem extracts were active against Gram-positive bacteria; fruit essential oil was active against Candida albicans (MIC = 0.46 mg/mL) [PMID:31052298, PMID:29907990]

Evidence summary

The current evidence is based on in vitro cell line studies, in silico docking, and in vivo animal models (rats). There are no human clinical trials provided in the abstracts.

PubMed sources

1.PMID: 42256167 (2026) — Thicket Formation and Light Limitation Drive Patch-Scale Vegetation Transitions in a Subtropical Savanna. · Ecology and evolution
2.PMID: 35885359 (2022) — Antioxidant Activities of Co-Encapsulated Natal Plum (Carissa macrocarpa) Juice Inoculated with Ltp. plantarum 75 in Different Biopolymeric Matrices after In Vitro Digestion. · Foods (Basel, Switzerland)
3.PMID: 36076736 (2022) — In Vitro Release of Anthocyanins from Microencapsulated Natal Plum (Carissa macrocarpa) Phenolic Extract in Alginate/Psyllium Mucilage Beads. · Foods (Basel, Switzerland)
4.PMID: 32260360 (2020) — Enrichment of Mango Fruit Leathers with Natal Plum (Carissa macrocarpa) Improves Their Phytochemical Content and Antioxidant Properties. · Foods (Basel, Switzerland)
5.PMID: 37631032 (2023) — Ethnomedicinal Uses, Phytochemistry, and Anticancer Potentials of African Medicinal Fruits: A Comprehensive Review.

Carissa macrocarpa

Sources & Citations

Calculate a safe dose of Carissa macrocarpa

Kunzea Ambigua

Solanum incanum

Markhamia Lutea

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Evidence summary

PubMed sources

Government sources

Carissa macrocarpa

Sources & Citations

Calculate a safe dose of Carissa macrocarpa

Related Herbs

Kunzea Ambigua

Solanum incanum

Markhamia Lutea

Frequently asked questions

Summary

Background

Traditional uses

Active compounds

Mechanism of action

Clinical evidence

Evidence summary

PubMed sources

Government sources