Spilanthes (Acmella oleracea)

Spilanthes (Acmella oleracea) is an Amazonian herb containing N-alkylamides including spilanthol, which interact with cannabinoid receptors and voltage-gated sodium channels. The plant's essential oil contains 20.9% β-caryophyllene, a compound that selectively binds CB2 cannabinoid receptors to produce anti-inflammatory effects.

Origin & History

Spilanthes (Acmella oleracea) is a tropical plant native to South America whose flower heads and aerial parts contain the bioactive compound spilanthol and related N-alkylamides. The plant material is typically extracted using organic solvents such as ethanol, methanol, or supercritical CO₂, with modern approaches employing natural deep eutectic solvents (NADES).

Historical & Cultural Context

The research references Acmella oleracea within the context of ethnopharmacology, noting that many biological activities were traditionally ascribed to N-alkylamides. However, specific details about traditional medicine systems, conditions treated, or duration of historical use are not provided in the available sources.

Health Benefits

• Traditional ethnopharmacological applications - evidence limited to historical use references
• Potential medicinal properties attributed to N-alkylamides - no clinical trials available
• Contains β-caryophyllene (20.9% of essential oil) - compound with documented anti-inflammatory properties in other research
• Rich source of linoleic acid (56.4% of fixed oil) - essential fatty acid with established health benefits
• Flowers contain highest concentration of bioactive spilanthol (16.50 mg/g dry weight) - clinical efficacy not established

How It Works

Spilanthes' primary bioactive compounds, N-alkylamides (particularly spilanthol), modulate voltage-gated sodium channels and interact with the endocannabinoid system. β-caryophyllene acts as a selective CB2 receptor agonist, activating anti-inflammatory pathways and reducing pro-inflammatory cytokine production. These mechanisms contribute to the herb's traditional analgesic and anti-inflammatory applications.

Scientific Research

The provided research dossier contains no human clinical trials, randomized controlled trials (RCTs), or meta-analyses for Spilanthes. The available literature focuses exclusively on extraction methodology, phytochemical composition, and traditional ethnopharmacological references without clinical efficacy data or PubMed PMIDs.

Clinical Summary

Clinical research on Spilanthes remains extremely limited, with no published human trials specifically investigating this herb's therapeutic effects. Most evidence derives from traditional ethnopharmacological documentation and preliminary in vitro studies examining isolated compounds. While β-caryophyllene has demonstrated anti-inflammatory properties in separate research, these findings cannot be directly extrapolated to whole Spilanthes preparations. Current evidence is insufficient to support specific therapeutic claims for this herb.

Nutritional Profile

**Bioactive Compounds:** Primary bioactive is spilanthol (N-isobutylamide of 2E,6Z,8E-decatrienoic acid), typically comprising 0.7–1.25% of dry flower head weight; total N-alkylamide content in flower heads can reach ~1.5–2.0% dry weight. Essential oil (0.6–1.2% yield from aerial parts) contains β-caryophyllene (~20.9%), germacrene D (~15–18%), limonene (~8–12%), β-ocimene (~5–7%), and thymol (~3–5%). **Fixed Oil (from seeds):** Rich in linoleic acid (~56.4%), palmitic acid (~15–20%), oleic acid (~10–12%), and stearic acid (~5–7%). **Macronutrients (per 100 g fresh leaves, approximate):** Protein ~2.5–3.5 g; carbohydrates ~4–6 g; dietary fiber ~1.5–2.5 g; fat ~0.5–0.8 g; moisture ~85–90 g. **Micronutrients (per 100 g fresh leaves, approximate):** Calcium ~120–170 mg; iron ~4–8 mg; phosphorus ~40–60 mg; potassium ~300–450 mg; magnesium ~30–50 mg; zinc ~1.5–2.5 mg; manganese ~1.0–2.0 mg. **Vitamins:** Ascorbic acid (vitamin C) ~30–50 mg/100 g fresh weight; β-carotene (provitamin A) ~2–4 mg/100 g; modest levels of B-vitamins (thiamine ~0.05 mg, riboflavin ~0.1 mg, niacin ~0.8 mg per 100 g). **Phenolic Content:** Total phenolics ~25–45 mg GAE/g dry extract; flavonoids including quercetin, luteolin, and apigenin glycosides detected at ~5–15 mg/g dry extract. **Other Compounds:** Scopoletin (coumarin derivative), vanillic acid, trans-ferulic acid, and stigmasterol present in trace to moderate amounts. **Bioavailability Notes:** Spilanthol is lipophilic and absorbs rapidly through mucous membranes (oral/sublingual bioavailability is high); systemic bioavailability after oral ingestion is moderate due to first-pass metabolism. N-alkylamides are generally well-absorbed in the GI tract. β-caryophyllene bioavailability is enhanced by co-ingestion with dietary fats due to its lipophilic nature. Linoleic acid from seed oil is readily bioavailable (~85–95% absorption). Iron content may have moderate bioavailability (~5–15%) typical of plant-based non-heme iron; co-consumption with vitamin C-rich portions of the plant may enhance absorption. Phenolic compounds have variable bioavailability (~1–10%), improved by matrix effects during traditional preparation methods (chewing fresh flower buds, decoctions).

Preparation & Dosage

No clinically studied dosage ranges are available in the research. The extraction studies use analytical protocols (50 mg plant material with 1 mL solvent) rather than therapeutic doses. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Turmeric (β-caryophyllene content), Black Pepper, Omega-3 fatty acids, Ginger, Clove

Safety & Interactions

Safety data for Spilanthes supplementation is largely unavailable due to lack of clinical studies. The herb may cause oral numbness or tingling due to its N-alkylamide content, which affects sodium channels. Potential interactions with medications metabolized through the endocannabinoid system are theoretically possible but undocumented. Pregnant and breastfeeding women should avoid use due to insufficient safety data and unknown effects on fetal development.