Simarouba (Simarouba amara)

Simarouba amara is an Amazonian tree whose bark contains quassinoids, primarily glaucarubinone and simarolide, which exhibit antiprotozoal and antimalarial properties. These bioactive compounds work by inhibiting protein synthesis in parasites and disrupting mitochondrial function in malaria parasites.

Origin & History

Simarouba amara is a tree species from the Simaroubaceae family, native to the rainforests and savannahs of Central and South America and the Caribbean. It is primarily harvested for its bark, leaves, and stem, with extraction typically using solvent methods to isolate quassinoids.

Historical & Cultural Context

Simarouba amara has been traditionally used in Central and South American rainforest medicine for its anthelmintic, anticancer, anti-inflammatory, and antimicrobial properties. Its historical use spans indigenous practices as a multipurpose therapeutic agent.

Health Benefits

• Antiprotozoal effects have been noted, though evidence is limited to preclinical studies. • Anti-amebic properties have been observed in vitro, suggesting potential therapeutic use. • Antimalarial activity is reported from animal studies, but lacks human trials. • Antitumor effects are indicated through in vitro studies, with no human data available. • Antiviral activity is documented in preclinical research, without supporting human trials.

How It Works

The primary bioactive compounds in Simarouba amara are quassinoids, particularly glaucarubinone and simarolide, which inhibit protein synthesis in protozoan parasites by interfering with ribosomal function. These compounds also disrupt mitochondrial electron transport in Plasmodium species, leading to parasite death. Additionally, the quassinoids appear to modulate immune responses by enhancing macrophage activity against pathogens.

Scientific Research

No human clinical trials, RCTs, or meta-analyses are available for Simarouba amara. The evidence is based solely on preclinical, in vitro, and animal studies.

Clinical Summary

Current evidence for Simarouba amara is limited to in vitro and animal studies, with no published human clinical trials. Laboratory studies show effectiveness against Entamoeba histolytica with IC50 values of 15-25 μg/mL for bark extracts. Animal studies in mice infected with Plasmodium berghei demonstrated 60-70% reduction in parasitemia at doses of 200-400 mg/kg. The lack of human trials significantly limits the assessment of therapeutic potential and safety profile in clinical applications.

Nutritional Profile

Simarouba amara (Paradise tree) nutritional and phytochemical profile is primarily characterized by its seed oil and bark constituents rather than conventional macronutrient data. Seed oil content: 55–73% fat from seeds, with fatty acid composition dominated by oleic acid (40–50%), palmitic acid (25–30%), stearic acid (8–12%), and linoleic acid (3–6%). The oil is semi-solid at room temperature due to its saturated fat fraction. Protein content in seed kernel: approximately 8–12% by dry weight. Carbohydrates in bark and leaves: limited data, but fiber fractions including cellulose and hemicellulose are present. Key bioactive compounds include quassinoids (glaucarubol, holacanthone, simaroubidin, and glaucarubinone) concentrated in the bark and stem at trace-to-milligram levels per gram of dry material — glaucarubinone detected at approximately 0.01–0.05% dry weight of bark. Alkaloids including canthin-6-one derivatives are present in bark at low concentrations (<0.1% dry weight). Triterpenes including simaroubaketone and simaroubalide are found in stem bark. Flavonoids and phenolic compounds are present in leaves, though specific concentrations are not well-quantified in available literature. Vitamin and mineral data for edible fractions are not formally documented; the oil fraction lacks significant micronutrient content beyond tocopherols (vitamin E analogs) estimated at 200–400 ppm in crude seed oil. Bioavailability: quassinoids are bioactive at very low doses but carry cytotoxicity concerns; oil fatty acids follow standard lipid absorption pathways with moderate bioavailability.

Preparation & Dosage

There are no clinically studied dosage ranges for Simarouba amara extracts or standardized forms, as no human clinical trials are available. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Curcumin, Ginger, Turmeric, Black Pepper, Ashwagandha

Safety & Interactions

Safety data for Simarouba amara is extremely limited due to the absence of human studies. Traditional use reports suggest potential gastrointestinal upset including nausea and diarrhea at higher doses. The quassinoids may interact with medications metabolized by cytochrome P450 enzymes, though specific interactions are not well documented. Use during pregnancy and lactation is not recommended due to insufficient safety data and potential effects on fetal development.