Agathosma betulina
Buchu
CautionOther names: Round-leaf buchu, Barosma betulina
A South African aromatic shrub with small glossy leaves and a pungent scent.
A low evergreen fynbos shrub with stiff glossy leaves and small white-to-pink flowers; the leaves contain an essential oil with a distinctive sharp camphor-citrus aroma.
- Family
- Rutaceae
- Plant type
- Evergreen shrub
What the safety levels mean (expand legend)
- Generally recognised as safe. Often a common herb with reasonable harvest and use; still read the specific warnings on the card.
- Information. Primarily informational — details in the text and warnings below matter most.
- Caution. Needs extra care (dose, duration, sensitive groups, interactions).
- Risky. Significant risks — verify sources, contraindications and professional guidance.
- Not for home experimentation. Not suitable to experiment with at home without knowledge and certainty.
- High risk for internal use. Particular risk with internal use (e.g. alkaloids); avoid prolonged or irresponsible dosing.
- Not specified. Level not filled in yet — rely on individual warnings and links below.
Photograph on Wikimedia Commons (Public domain).
Plant habit
Safety — read before use
For this herb it is important to check warnings, mix-ups and cautions. Start with the Safety section.
Quick overview
A practical summary; details are in the sections below.
- Safety grade
- Caution details
- Scientific sources on the card
- Yes — sources are listed with claims Science section
- When and what to harvest
- Leaf — December–February
- Processing methods
Herbal infusion (tea), Herbal vinegar, Herbal liqueur, Essential oil
All methods and recipes on the card- Topics and symptoms
Bruises & scars (topical care), Kidneys & urinary comfort, Men's urinary comfort
Topics section, Symptoms overview
Identification and mix-ups
Fynbos shrub in Rutaceae. Leaves small, round, with a finely serrated margin and a scratchy feel; conspicuous round essential-oil glands are visible on the leaf. Flowers usually solitary, five-petalled, star-shaped, white to purplish-pink; the whole plant has a strong characteristic buchu aroma (reminiscent of blackcurrant).
Possible mix-ups and risks
The main lookalike and adulterant is Agathosma crenulata (oval-leaf buchu), whose leaves are more long-oval. Caution: its oil is high in pulegone, a hepatotoxic and potentially abortifacient compound, so this lookalike is itself a safety risk.
Similar herbs
No related herbs are linked yet.
Topics and symptoms
More topics are in the symptoms and topics overview.
- Bruises & scars (topical care)Traditional· Traditional / cultural framing
- Kidneys & urinary comfortTraditional· Traditional / cultural framing
- Men's urinary comfortTraditional· Traditional / cultural framing
Sources
Geographic occurrence
South Africa
Common (expected wild occurrence in the region)
Harvest
- LeafDecember–February
summer
Region: South AfricaNotes: Leaves at peak essential-oil content during the growing season.
Storage
- Airtight storage(Leaf)
Dried leaves keep a year in an airtight jar; the essential oil (diosphenol, pulegone, menthone) evaporates quickly, after a year the leaf smells faint.
- Light:
- Out of light.
- Moisture:
- Protect from moisture.
Processing methods on this herb card
Infusion or brief extraction in hot water; usually without long boiling.
Full method description (from the catalogue)
Here, herbal tea is prepared as an infusion: pour freshly boiling water over dried herbs or a herbal blend and steep for at least 5 minutes. BfR gives this as a hygiene rule, not a medicinal dose. Follow the specific product instructions, including a longer steeping time when stated. This rule for herbal infusions is not a general preparation guide for true tea (Camellia sinensis). Temperature, steep time, and the herb-to-water ratio change both flavour and what dissolves into the liquid.
Compared with a decoction, heat exposure is shorter and gentler; tender leaves and flowers are often better as an infusion than with prolonged simmering. For each herb, always follow the plant card for suitable plant part, preparation, and safety notes — general rules never replace species-level judgement.
Traditional context for this method: yes·Scientific context for this method: no
Maceration or extraction in vinegar; acidity changes flavour and extraction.
Full method description (from the catalogue)
Herbal vinegar uses acetic acid as part of the solvent. You get different flavours and sometimes different stability than with alcohol or water. Vinegars are used culinarily and as bases for traditional oxymels per recipe.
Vinegar quality (food grade, known origin) matters; metal vessels can react — prefer glass or stainless steel.
Traditional context for this method: yes·Scientific context for this method: no
Sweet alcoholic macerate with herbs; sugar and ethanol drive the outcome.
Full method description (from the catalogue)
A liqueur combines herbs, spirit, and sweetener into a strongly aromatic mixture. Home batches differ from commercial products in law and in how strength is controlled.
Follow the recipe for dosing and storage; maceration time changes colour and flavour.
Traditional context for this method: yes·Scientific context for this method: no
A concentrated aromatic plant product; use depends on the specific product.
Full method description (from the catalogue)
Essential oil is a concentrated plant product obtained, for example, by steam distillation or pressing. A general drop count or dilution ratio does not establish safe use.
Choose a finished product intended for your purpose and follow its directions. Do not apply it to skin or swallow it unless the manufacturer explicitly allows that use. This overview is not a recipe for home dilution.
Traditional context for this method: no·Scientific context for this method: no
Buchu oil is distilled industrially for the flavour industry (a blackcurrant note). It contains pulegone — never internally, on the skin only strongly diluted, not in pregnancy.
Traditional / spiritual use
Kept separate from science — entries are cultural or symbolic, not medical advice.
Boegoe — the perfume and medicine the Khoi wore on the body
General
Traditional useFolk useHerbal loreRitualThe Khoi and San ground dried buchu leaves with sheep fat into a fragrant ointment rubbed over the body — as perfume, as protection of the skin against sun and dryness, and in ceremonies; among the Khoi the name boegoe covered several fragrant shrubs. Dutch settlers took the leaves into brandy (boegoebrandewyn) for the stomach and into vinegar (boegoe-asyn) for bruises and sprains; buchu was exported to Europe from the 1820s. A record of cultural tradition.
- Form:
- boegoe — fragrant Khoi ointment, settlers' brandy and vinegar
- Claim strength:
- Tradition
- Source note:
- Moolla A, Viljoen AM (2008), J Ethnopharmacol 119:413–419 (ethnobotany and history).
Scientific notes
Each claim lists a study type and a source (URL or DOI) where available. Dose notes from the literature are informational only.
How to read evidence strength and study type labels
Labels summarise how the catalogue entry is tagged — they are not a medical verdict on efficacy. For every row, read the summary, limitations and source link.
Evidence strength
- Evidence level not specified
- The author did not grade the record; judge from the summary, limitations and source link.
- Narrative / orientational literature
- Descriptive or expert literature without controlled group comparison — context rather than proof of effect.
- Weak evidence
- Study or conclusion with major methodological limits; treat only as a pointer for further reading.
- Preliminary findings
- First or smaller studies — interesting direction, not the final word on efficacy or safety.
- Moderate strength of evidence
- Moderate strength by study design; sample and context limits still apply.
- Stronger evidence
- Stronger design or consistency of results within the study's stated limits.
- Review article
- A review summarises multiple sources; quality depends on review method and field.
Study type
- Narrative / expert text
- Expert text or overview without a classical study design.
- In vitro study
- Cell culture or test-tube experiment — does not show an effect in the body.
- Animal study
- Animal model — transfer to humans is not automatic.
- Observational study
- Observing groups without random treatment assignment; confounding is possible.
- Clinical trial
- Human clinical trial; sample size and control group matter.
- Randomised controlled trial
- Randomised controlled trials are among the stronger designs when well conducted.
- Review study
- A review aggregates multiple papers — quality depends on selection rules.
- Systematic review
- Systematic review with explicit search and selection methodology.
- Meta-analysis
- Statistical pooling of studies; outcome depends on input data and heterogeneity.
- Regulatory assessment / monograph (EMA, WHO…)
- Regulatory body summary for a herbal product — different context from a single RCT; often about products, not home tea.
- Expert monograph (herbal preparations)
- Structured literature summary for a plant or drug — quality depends on author and edition year.
The review summarises the ethnobotany of both buchu species, the composition of the oil (diosphenol, pulegone, menthone, limonene) and flavonoids, and laboratory data on antimicrobial, antispasmodic and anti-inflammatory activity; it flags the high content of hepatotoxic pulegone in A. crenulata and the absence of clinical trials.
Narrative / orientational literatureReview studyYear: 2008Limitations: No clinical data; oil composition varies with species, origin and season.
Moolla A, Viljoen AM — Journal of Ethnopharmacology
'Buchu' – Agathosma betulina and Agathosma crenulata (Rutaceae): A review
Images
The main photo is in the card header. More images will appear here when available.
Safety
What the warning types mean
The type on each warning helps group themes — it does not replace the separate severity badge.
- Internal use
- Risks from swallowing, extracts, duration of use or concentration for internal use.
- Interactions / medicines
- Possible effect on medicines or concurrent treatment — check sources and a professional.
- Raw plant parts
- Raw, unripe or poorly prepared plant parts can be dangerous.
- Toxins and regulation
- Toxic constituents or regulated compounds (e.g. in distillates).
- Contact with the plant
- Skin or mucosa irritation from contact with fresh plant or sap.
- Allergy
- Allergic reactions, often linked to family sensitisation.
- Harvesting and contamination
- Contamination, species mix-ups or harvesting from unsuitable places.
- Pregnancy and pulegoneModerate severitypregnancy
Buchu leaves contain pulegone, which is hepatotoxic at higher doses; traditionally avoided during pregnancy and breastfeeding.
- Pulegone — species mix-ups and liver toxicityModerate severityliver
Buchu oil contains pulegone, a monoterpene that is liver-toxic at high doses (known from pennyroyal). Per the review by Moolla & Viljoen 2008 Agathosma betulina has only a few percent pulegone in its oil while A. crenulata has tens of percent; commercial buchu is, however, often blended or substituted. Do not drink concentrated infusions or long-term, never take the oil internally, and skip with liver disease.