Bulbine Natalensis (Bulbine natalensis): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Bulbine natalensis increase testosterone levels?

Bulbine natalensis appears to stimulate testosterone production through luteinizing hormone (LH) activation. The herb's steroid saponins and alkaloids may signal the hypothalamic-pituitary-gonadal axis, prompting the testes to increase natural testosterone synthesis. This mechanism differs from exogenous testosterone replacement, as it works through the body's own hormonal pathways rather than direct supplementation. Evidence level: C.

Does Bulbine natalensis interact with medications?

Bulbine natalensis may interact with hormone-related medications, including testosterone replacement therapy, anabolic steroids, and hormonal contraceptives, potentially amplifying androgenic effects. Due to its hepatotoxicity potential, it should not be combined with other liver-stressing substances such as acetaminophen, alcohol, or certain prescription medications. Those on blood thinners or diabetes medications should consult a healthcare provider before use. Evidence level: C/Theoretical.

What is the recommended dosage for Bulbine natalensis?

Clinical research has used Bulbine natalensis extract at doses of 25-50mg per kilogram of body weight daily. For standardized extracts, this typically translates to 300-600mg daily for most adults. Due to hepatotoxicity concerns, cycling use (such as 4-8 weeks on followed by a break) is recommended rather than continuous long-term supplementation. Evidence level: C.

Is Bulbine natalensis safe during pregnancy or breastfeeding?

Bulbine natalensis is considered unsafe during pregnancy and breastfeeding. The herb's testosterone-boosting and mild androgenic effects could disrupt normal hormonal development in a fetus or nursing infant. Additionally, the potential for hepatotoxicity poses risks during these vulnerable periods. Women who are pregnant, planning pregnancy, or breastfeeding should avoid this herb entirely. Evidence level: C/Traditional contraindication.

What are the side effects of Bulbine natalensis?

Potential side effects include hepatotoxicity (liver stress or damage), particularly with prolonged use or high doses. Users may experience mild androgenic effects such as increased aggression, acne, or mood changes. Individuals with pre-existing liver conditions should avoid this herb entirely. Cycling use and periodic liver function monitoring during supplementation is advisable. Evidence level: C.

What is Bulbine natalensis used for traditionally?

Bulbine natalensis has been used traditionally by Zulu healers in South Africa primarily for wound healing and treating skin conditions. The succulent leaves are applied topically to cuts, burns, and skin irritations. It has also been used traditionally for male sexual dysfunction and as an aphrodisiac. Modern interest focuses on its potential testosterone-supporting properties. Evidence level: Traditional/C.

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 19 PubMed articles · model: gemma4:31b

Summary

Bulbine natalensis (syn. Bulbine latifolia) is a succulent medicinal plant native to southern Africa used traditionally for wound healing, skin disorders, and sexual enhancement [PMID:42259979, 34043766].

Background

Bulbine natalensis is a member of the Asphodelaceae family indigenous to southern Africa [PMID:20937372, 42259979]. It is an emerging medicinal herb on the global market, often formulated in dietary supplements [PMID:34359083].

Traditional uses

Traditionally used in South Africa for the treatment of skin wounds, burns, and dermatological disorders [PMID:23078885, 41095187], as well as for treating diabetes [PMID:34919745], infections, and as an aphrodisiac [PMID:42259979, 34043766].

Active compounds

Bioactive constituents include anthraquinones (such as knipholone, bulbine-knipholone, and 6'-O-methylknipholone), triterpenes, sterols, fatty acids, phenolic compounds, saponins, cardiac glycosides, tannins, and alkaloids [PMID:34359083, 31287681, 42259979, 18710410].

Mechanism of action

The herb modulates the activity of AhR, CYP1A2, CYP2B6, and P-gp [PMID:34359083]. It activates the pregnane X receptor (PXR), leading to increased mRNA expression and activity of CYP3A4 and CYP2C9 [PMID:33321412]. In wound healing, it is linked to the modulation of the coagulation cascade and tissue repair properties [PMID:41095187].

Clinical evidence

Evidence DCutaneous Wound Healing

Leaf gel extracts increase tensile strength and protein and DNA content in pig dermal wounds [PMID:23078885, 20937372]

Evidence DSexual Function/Androgenic Activity

Aqueous stem extract (25-50 mg/kg) increased serum testosterone, luteinizing hormone, and sexual behavior indices in male rats [PMID:18710410, 20645801, 19410284]

Evidence DCancer (Leukemia)

Root methanolic extracts showed cytotoxicity and induced apoptosis in human myelogenous leukemia (K562) cell lines [PMID:34932629]

Evidence DBacterial Infection

Ethanolic, n-butanol, and ethyl acetate fractions of the tuber inhibited various bacterial species, including MRSA [PMID:31287681, 23983381]

Safety & adverse effects

In rats, aqueous stem extract (50-100 mg/kg) increased activities of liver enzymes (GGT, ALP, ALT, AST) and total bilirubin, and reduced liver- and kidney-body weight ratios [PMID:19735182]. It also increased serum cholesterol and triacylglycerols while decreasing high-density lipoprotein cholesterol [PMID:19382725]. High doses (100 mg/kg) may produce contrasting patterns to lower doses regarding sexual behavior and hormonal effects [PMID:18710410, 19410284].

Drug interactions

B. natalensis extracts and knipholones dose-dependently increase the activity of CYP1A2, CYP2B6, CYP3A4, and CYP2C9, indicating a potential for herb-drug interactions (HDI) with prescription drugs metabolized by these enzymes [PMID:34359083, 33321412].

Evidence summary

The current evidence is primarily based on in vitro studies and animal models (rats and pigs), with a lack of human clinical trials. Evidence strength is low (Level D).

PubMed sources

1.PMID: 34359083 (2022) — Bulbine natalensis (currently Bulbine latifolia) and select bulbine knipholones modulate the activity of AhR, CYP1A2, CYP2B6, and P-gp. · Planta medica
2.PMID: 23078885 (2012) — Bulbine natalensis and Bulbine frutescens promote cutaneous wound healing. · Journal of ethnopharmacology
3.PMID: 20937372 (2011) — A biochemical comparison of the in vivo effects of Bulbine frutescens and Bulbine natalensis on cutaneous wound healing. · Journal of ethnopharmacology
4.PMID: 33321412 (2021) — Modulation of CYP3A4 and CYP2C9 activity by Bulbine natalensis and its constituents: An assessment of HDI risk of B. natalensis containing supplements. · Phytomedicine : international journal of phytotherapy and phytopharmacology
5.PMID: 34919745 (2023) — In vitro profiling and functional assessments of the anti-diabetic capacity of phenolic-rich extracts of Bulbine natalensis and Bulbine frutescens.

Bulbine Natalensis

Sources & Citations

Calculate a safe dose of Bulbine Natalensis