Hermetica Superfood Encyclopedia
The Short Answer
Aloalo contains flavonoids, chromenes such as 6-acetyl-7-methoxy-2,2-dimethylchromene, alkaloids, and essential oils that exert antimicrobial effects through cell wall disruption and antioxidant effects via free radical scavenging, with a DPPH IC50 of 25.4 ± 0.5 µg/mL in methanol leaf extracts. In rodent models, hydroalcoholic leaf extract administered at 250–500 mg/kg body weight significantly inhibited proliferative inflammation, exudate formation, and granuloma development, supporting its traditional Samoan application to wounds and respiratory infections.
CategoryHerb
GroupPacific Islands
Evidence LevelPreliminary
Primary KeywordAloalo benefits
Aloalo — botanical close-up
Health Benefits
**Antioxidant Protection**
Methanol leaf extracts demonstrate potent free radical scavenging with a DPPH IC50 of 25.4 ± 0.5 µg/mL and ferric-reducing capacity of 0.95 ± 0.52 mmol EAA/g, attributable to polyphenols, flavonoids, and tannins neutralizing reactive oxygen species.
**Anti-inflammatory Action**
Hydroalcoholic leaf extract at 250–500 mg/kg body weight inhibited cotton pellet-induced granuloma and formaldehyde-induced exudate formation in rodents, with mechanisms involving protein denaturation inhibition, membrane stabilization, and molecular docking evidence for p38-MAPK signaling blockade.
**Wound Healing Support**
Traditional Samoan use for topical wound application is supported by the plant's combined antimicrobial and anti-inflammatory phytochemistry, including flavonoids and coumarins that reduce microbial load while moderating inflammatory cascades at the wound site.
**Antimicrobial Activity**
Crude leaf extracts exhibit minimum inhibitory concentrations of 2–4 mg/mL against bacterial strains including Staphylococcus epidermidis, with inhibition zones of 10–13 mm, and essential oils suppress aflatoxin production by Aspergillus parasiticus by more than 84% at 0.5–0.75 mg/mL.
**Antifungal Properties**
Terpene- and alkaloid-rich extracts demonstrate fungicidal activity against Fusarium spp. at MICs of 80–120 mg/mL, and volatile essential oil components act as fumigants to inhibit fungal spore germination and mycotoxin biosynthesis.
**Respiratory Infection Relief**
In Samoan traditional medicine, Aloalo is prepared and consumed to address colds and upper respiratory complaints, consistent with the plant's documented ability to inhibit biofilm formation in respiratory pathogens such as Pseudomonas aeruginosa and Escherichia coli through oxidative stress reduction.
**Pesticidal and Antiparasitic Effects**
Leaf extracts at 12% concentration achieved 95% larval mortality in Spodoptera litura bioassays (LC50: 3.45–3.87%; LC80: 7.76–8.18%), with terpenes and sulfur compounds implicated in disrupting insect neurological and metabolic function.
Origin & History
Natural habitat
Ageratum conyzoides is native to tropical and subtropical regions of Central and South America but has naturalized extensively throughout Africa, Asia, and the Pacific Islands, including Samoa, where it is commonly called Aloalo. It thrives in disturbed soils, roadsides, agricultural margins, and humid lowland environments up to approximately 2,400 meters elevation, requiring minimal cultivation. In the Pacific, it grows as a weedy annual herb and has been integrated into indigenous medicinal traditions due to its abundance and accessibility.
“Ageratum conyzoides has been used medicinally for centuries across tropical cultures in Africa, Asia, Latin America, and the Pacific Islands, with Samoan practitioners employing the plant — known locally as Aloalo — primarily to treat wounds and cold symptoms through topical application and oral decoctions. In West African and Indian Ayurvedic traditions, the plant has been documented for use in skin disorders, rheumatic pain, and febrile illness, reflecting convergent ethnomedicinal recognition of its anti-inflammatory and antimicrobial properties across unrelated cultural systems. In the Pacific, the plant's weed-like abundance along roadsides and cultivated fields made it a readily accessible first-response remedy, and its preparation typically involved minimal processing — leaves were crushed, macerated in water, or heated for immediate use. The Asteraceae family, to which Aloalo belongs, has broad historical association with wound healing and anti-infective applications globally, and Ageratum conyzoides is listed in several regional pharmacopoeias and ethnobotanical surveys as a priority plant for further pharmaceutical investigation.”Traditional Medicine
Scientific Research
The evidentiary base for Ageratum conyzoides consists entirely of in vitro assays, phytochemical characterization studies, and rodent or insect bioassays; no human clinical trials have been published or are available in indexed literature as of the current review. Antioxidant studies using DPPH, ABTS, and FRAP assays report reproducible and quantified IC50 values (DPPH IC50: 25.4 ± 0.5 µg/mL) from methanol leaf extracts, representing moderately strong preclinical antioxidant data. In vivo anti-inflammatory studies conducted in rodents using hydroalcoholic extracts at 250–500 mg/kg demonstrate statistically significant reductions in granuloma weight and exudate volume relative to controls, but these animal-to-human translational gaps remain unaddressed. Antimicrobial and larvicidal studies are similarly restricted to controlled laboratory conditions with small experimental replication units (n=6 replicates per treatment in larval bioassays), and no pharmacokinetic, bioavailability, or dose-escalation data in humans exist, rendering the current evidence base preliminary by clinical standards.
Preparation & Dosage
Traditional preparation
**Traditional Leaf Poultice (Topical)**
Fresh or bruised leaves applied directly to wounds or skin infections as practiced in Samoan ethnomedicine; no standardized dose defined, applied as needed.
**Traditional Decoction (Oral)**
Leaves boiled in water and consumed as a tea for colds and respiratory complaints in Pacific Island traditions; preparation volume and concentration unstandardized.
**Hydroalcoholic Extract (Research-Grade, Animal)**
250–500 mg/kg body weight administered orally in rodent anti-inflammatory studies; human equivalent dose not established and extrapolation is speculative
**Methanol Leaf Extract (Laboratory)**
Prepared by cold maceration or Soxhlet extraction at concentrations yielding IC50 of 25.4 µg/mL for DPPH scavenging; not a consumer supplement form.
**Essential Oil (Fumigant/Topical Research)**
75 mg/mL; no human topical dose established
Extracted by hydrodistillation; effective against Aspergillus parasiticus aflatoxin production at 0.5–0..
**Pesticidal Spray (Agricultural)**
Aqueous leaf extract at 6–12% concentration for biopesticidal applications against lepidopteran larvae; not applicable to human supplementation.
**Standardization**
No commercial supplement standardization (e.g., percent flavonoids or chromenes) has been established for this ingredient.
Nutritional Profile
Ageratum conyzoides leaves are not consumed as a food source and lack comprehensive macronutrient or micronutrient profiling in nutritional databases. Phytochemically, the leaves are rich in flavonoids, phenolic acids, tannins, coumarins, saponins, and polyphenols that function as bioactive secondary metabolites rather than essential nutrients. GC-MS analysis of methanol extracts identifies specific compounds including 6-acetyl-7-methoxy-2,2-dimethylchromene, hexadecanoic acid (palmitic acid), and squalene, the latter being a lipid-soluble triterpene with antioxidant relevance. Essential oil fractions contain volatile terpenes and eugenol derivatives whose bioavailability is inferred to be moderate via lipid-mediated absorption, though no formal bioavailability studies using area-under-the-curve pharmacokinetic methods have been conducted in any species.
How It Works
Mechanism of Action
The flavonoids and polyphenols in Ageratum conyzoides scavenge free radicals by donating hydrogen atoms to DPPH and ABTS•+ radicals and reduce ferric iron to ferrous iron (FRAP value 0.95 ± 0.52 mmol EAA/g), thereby interrupting oxidative chain reactions that damage cellular lipids, proteins, and DNA. Anti-inflammatory activity is mediated through inhibition of lipoxygenase at 50% inhibition at 150 ± 5.7 µg/mL extract concentration, suppression of protein denaturation, stabilization of erythrocyte membranes against hypotonic lysis, and blockade of the p38-MAPK signaling pathway as predicted by molecular docking studies of chromene and alkaloid constituents. Antimicrobial action involves disruption of bacterial and fungal cell wall integrity by terpenes and essential oil volatiles, competitive inhibition of microbial enzymes, and reduction of quorum-sensing-dependent biofilm formation in Gram-negative organisms such as P. aeruginosa and E. coli. The chromene compound 6-acetyl-7-methoxy-2,2-dimethylchromene, identified via GC-MS in methanol extracts, is particularly implicated in antifungal and insecticidal activity through interference with membrane-associated enzyme complexes and inhibition of aflatoxin biosynthetic gene expression in Aspergillus parasiticus.
Clinical Evidence
No human clinical trials investigating Ageratum conyzoides for any indication have been identified in available literature, precluding direct clinical efficacy or safety conclusions. The most methodologically rigorous available evidence comprises rodent anti-inflammatory models in which hydroalcoholic leaf extract at 250–500 mg/kg body weight produced measurable reductions in proliferative inflammation and exudate formation, and in vitro antimicrobial panels demonstrating MICs of 2–4 mg/mL against bacterial strains and inhibition zones of 10–13 mm against Staphylococcus epidermidis. Larvicidal bioassays achieved 95% mortality of Spodoptera litura at 12% extract concentration with LC50 values of 3.45–3.87%, constituting consistent but ecologically specialized data. Confidence in clinical benefit for humans remains low, and all observed effects should be interpreted as hypothesis-generating until controlled human trials are conducted.
Safety & Interactions
Formal human safety data for Ageratum conyzoides are absent, and no established maximum safe dose, no-observed-adverse-effect level (NOAEL), or human toxicity threshold has been determined through controlled study. In animal research, extracts at doses up to 500 mg/kg body weight and pesticidal concentrations up to 12% produced no reported adverse effects in rodent or insect models, but the absence of systematic toxicological evaluation — including hepatotoxicity, nephrotoxicity, and genotoxicity panels — means this apparent tolerability cannot be generalized to humans. The presence of coumarins raises a theoretical risk of potentiation of anticoagulant medications such as warfarin, and the potent antimicrobial activity of terpenes and essential oils suggests a plausible risk of gut microbiome disruption with prolonged oral use, though both interactions are untested. Pregnancy and lactation represent absolute precautionary contraindications given the complete absence of reproductive toxicity data, and individuals taking antibiotics, antifungals, or anticoagulant medications should avoid use without medical supervision.
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Also Known As
Ageratum conyzoidesBillygoat weedGoatweedWhiteweedTropic ageratumAloalo (Samoan)
Frequently Asked Questions
What is Aloalo used for in Samoan traditional medicine?
In Samoan tradition, Aloalo (Ageratum conyzoides) is used primarily for wound healing and relief of cold symptoms. Leaves are typically prepared as a topical poultice or boiled into a decoction for oral consumption, with the plant's flavonoids, alkaloids, and essential oils providing the antimicrobial and anti-inflammatory activity that underpins these applications.
Does Ageratum conyzoides have proven antimicrobial properties?
Yes, in laboratory studies, crude leaf extracts of Ageratum conyzoides demonstrated inhibition zones of 10–13 mm against Staphylococcus epidermidis and minimum inhibitory concentrations of 2–4 mg/mL against bacterial strains. Essential oil fractions suppressed aflatoxin production in Aspergillus parasiticus by more than 84% at concentrations of 0.5–0.75 mg/mL, though no human clinical trials have confirmed these effects in vivo.
Is Aloalo safe to use during pregnancy?
No safety data for Ageratum conyzoides during pregnancy or lactation exists in peer-reviewed literature, and its use in these populations is not recommended. The plant contains coumarins and alkaloids with unknown reproductive toxicity profiles, and precautionary avoidance is strongly advised until formal reproductive safety studies are completed.
What are the active compounds in Ageratum conyzoides?
The primary bioactive compounds identified in Ageratum conyzoides include 6-acetyl-7-methoxy-2,2-dimethylchromene, flavonoids, alkaloids, phenolic acids, tannins, coumarins, saponins, squalene, hexadecanoic acid, and volatile terpenes. GC-MS analysis of methanol leaf extracts confirmed these constituents, with chromenes and flavonoids most strongly associated with antioxidant and antimicrobial activity respectively.
What dose of Aloalo extract was used in anti-inflammatory research?
In rodent models, hydroalcoholic leaf extract of Ageratum conyzoides was administered orally at 250–500 mg/kg body weight and significantly inhibited proliferative inflammation, granuloma formation, and exudate production induced by cotton pellet and formaldehyde protocols. No human equivalent dose has been established, and direct extrapolation from animal studies to human supplementation is not currently supported by clinical evidence.
What is the most bioavailable form of Aloalo for antioxidant benefits?
Methanol and hydroalcoholic leaf extracts of Ageratum conyzoides demonstrate superior bioavailability for antioxidant compounds, with methanol extracts showing a DPPH IC50 of 25.4 ± 0.5 µg/mL. These extraction methods effectively concentrate polyphenols, flavonoids, and tannins that are responsible for the potent free radical scavenging activity. Standardized extracts are generally more consistent than whole leaf preparations for achieving the antioxidant benefits documented in research.
How strong is the clinical evidence for Aloalo's anti-inflammatory effects?
Research demonstrates moderate to strong evidence for Aloalo's anti-inflammatory action, with hydroalcoholic leaf extracts at 250–500 mg/kg body weight effectively inhibiting cotton pellet-induced inflammatory responses in animal models. The mechanism involves the polyphenolic and flavonoid compounds reducing reactive oxygen species and inflammatory markers. While animal studies are promising, human clinical trials are limited, making this an area requiring further research to establish optimal dosing and efficacy in humans.
Who would benefit most from Aloalo supplementation based on its antioxidant and anti-inflammatory properties?
Individuals seeking antioxidant support and those with inflammatory conditions may benefit most from Aloalo, given its dual mechanism of free radical scavenging through polyphenols and tannins combined with anti-inflammatory activity. People with oxidative stress-related conditions or chronic inflammatory disorders could be candidates for supplementation. However, those already taking anti-inflammatory medications should consult a healthcare provider, as the potency of Aloalo extracts may warrant monitoring for potential interactions.
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