Herbs (Global Traditional) · Amazonian
Bixa orellana
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Bixa orellana contains bixin and norbixin carotenoids that exhibit antimicrobial and anti-inflammatory properties. Research suggests potential applications for reducing halitosis through photodynamic therapy and managing benign prostatic hyperplasia symptoms.
Bixa orellana is a tropical shrub native to Central and South America, particularly the Amazon region, whose seeds and leaves are used medicinally and commercially. The seeds contain bixin, a carotenoid pigment traditionally used as a natural food colorant (annatto), and various extraction methods include methanol extraction, aqueous extraction, steam distillation, and standardized preparations.
Clinical evidence for Bixa orellana remains limited, with one registered trial for halitosis (NCT03346460) and a double-blind study for benign prostatic hyperplasia, though neither has published detailed results. Most research consists of animal studies demonstrating anticonvulsant, analgesic, and anti-inflammatory effects at doses ranging from 50-500 mg/kg.
Animal studies have used oral extract doses of 125-500 mg/kg body weight in mice, anti-inflammatory aqueous extracts at 50-150 mg/kg in rats, and pain reduction formulations at 400 mg/kg orally or 10 mg/kg intramuscularly as nanodispersion. No standardized human dosage ranges have been established. Consult a healthcare provider before starting any new supplement.
Bixa orellana (annatto) seeds contain the following characterized components: Carotenoids (primary bioactives): bixin (80-90% of total carotenoids, 0.001-0.9% dry weight of seeds, a lipid-soluble apocarotenoid), norbixin (water-soluble form derived from bixin hydrolysis). Total carotenoid content ranges 2.4-4.8 mg/g dry seed weight. Tocotrienols: delta-tocotrienol and gamma-tocotrienol present in seed oil (annatto is notably the richest known plant source of tocotrienols, with delta-tocotrienol comprising ~90% of tocotrienol fraction at approximately 230-900 mg/100g oil). Lipid content: seed oil constitutes approximately 3-5% of seed dry weight, composed primarily of oleic acid (~46%), linoleic acid (~33%), palmitic acid (~14%). Protein: approximately 13-16% of seed dry weight, with essential amino acids including glutamic acid and aspartic acid as predominant fractions. Fiber: seed pulp contains approximately 18-22% crude fiber (pectin-rich). Minerals: calcium (53 mg/100g), phosphorus (26 mg/100g), iron (1.5 mg/100g), zinc (0.9 mg/100g), magnesium (12 mg/100g) in seed meal. Vitamins: vitamin C traces (~0.5 mg/100g), negligible B-vitamins. Phenolic compounds: ellagic acid, gallic acid, and flavonoids (quercetin derivatives) at 2-8 mg GAE/g dry weight. Bioavailability notes: bixin bioavailability is enhanced with dietary fat co-ingestion (lipid-soluble); tocotrienols demonstrate superior cellular uptake compared to tocopherols due to structural differences enabling faster membrane penetration; norbixin shows limited absorption without lipid matrix.
Bixin and norbixin carotenoids in Bixa orellana generate reactive oxygen species when activated by blue LED light, providing antimicrobial effects against oral bacteria. These compounds also modulate inflammatory pathways by inhibiting cyclooxygenase and lipoxygenase enzymes, potentially reducing prostatic inflammation through NF-κB pathway suppression.
A photodynamic therapy study (NCT03346460) investigated Bixa orellana with blue LED light for halitosis treatment, though results remain unpublished. One double-blind randomized placebo-controlled trial examined its effects on benign prostatic hyperplasia symptoms, showing promise but lacking specific quantified outcomes. Current clinical evidence is limited and requires further validation through completed studies with published results.
Bixa orellana appears generally well-tolerated when used topically or in traditional preparations. Photosensitivity may occur with light-based treatments, requiring protective measures during photodynamic therapy sessions. No significant drug interactions have been documented, though carotenoid absorption may be enhanced by dietary fats. Safety during pregnancy and lactation has not been established through clinical studies.
