Herbs (Global Traditional) · Native American
Chaparral (Larrea tridentata) (Larrea tridentata)
Moderate Evidencebotanical
Hermetica Superfood Encyclopedia
Chaparral (Larrea tridentata) is a desert shrub containing nordihydroguaiaretic acid (NDGA) that demonstrates antioxidant and antimicrobial properties in laboratory studies. The plant's bioactive compounds, including NDGA and flavonoids, work by scavenging free radicals and inhibiting lipid peroxidation.
Chaparral derives from Larrea tridentata (creosote bush), a woody shrub native to the deserts of the southwestern United States and northern Mexico. The plant's leaves and aerial parts are harvested and processed into extracts using solvents like methanol or dichloromethane, yielding a herbal mixture rich in lignans, flavonoids, and polyphenols.
No human clinical trials, RCTs, or meta-analyses were identified in the available research. Evidence is limited to preclinical in vitro and animal studies examining antioxidant and anti-inflammatory effects of compounds like NDGA. LiverTox documentation focuses on hepatotoxicity cases rather than efficacy trials.
No clinically studied dosage ranges are available as human trials are absent. Traditional uses mention powder or extract forms without standardization specifics. Maximum safe doses are not established due to documented hepatotoxicity and nephrotoxicity risks. Consult a healthcare provider before starting any new supplement.
Chaparral (Larrea tridentata) is not consumed as a food source and therefore lacks a conventional macronutrient profile (negligible calories, protein, fat, and carbohydrates per typical dose of 1–3 g dried leaf/stem). Its significance lies entirely in its bioactive compound profile: • **Nordihydroguaiaretic acid (NDGA):** The principal lignan, comprising approximately 5–10% of dry leaf weight (50–100 mg/g dried leaf); a potent lipophilic antioxidant with low oral bioavailability due to extensive first-pass hepatic metabolism and glucuronidation; in vitro IC50 for lipid peroxidation inhibition reported at low micromolar concentrations. • **Flavonoids:** Includes quercetin (~0.2–0.5% dry weight), kaempferol, and their glycosides; bioavailability of quercetin aglycone is estimated at 2–5% orally, improved modestly with dietary fat co-ingestion. • **Lignans (beyond NDGA):** 3'-demethoxy-6-O-demethylisoguaiacin, dihydroguaiaretic acid, and norisoguaiacin present at lower concentrations (~0.5–2% collectively). • **Triterpene saponins and wax esters:** Larreatridentatins and related compounds found primarily in leaf resin (~10–15% of total resin weight); poorly characterized bioavailability. • **Volatile terpenoids:** Including α-pinene, β-pinene, camphene, and limonene in the essential oil fraction (~0.3–1.0% of dried leaf). • **Minerals (trace):** Small amounts of potassium, calcium, magnesium, and iron present in leaf tissue, but quantities per typical dose are nutritionally insignificant (e.g., calcium ~10–20 mg/g, iron ~0.1–0.3 mg/g dried leaf). • **Phenolic acids:** Caffeic acid and chlorogenic acid present at trace levels (~0.1–0.3% dry weight). • **Fiber:** Crude fiber content approximately 15–25% of dried leaf material, but irrelevant at typical dosing amounts. • **Resin content:** Total leaf resin constitutes approximately 15–25% of dry weight, serving as the matrix for most bioactive compounds. **Critical bioavailability note:** NDGA and related lignans are highly lipophilic (log P ~3.5–4.0), limiting aqueous dissolution; traditional preparation as a tea (aqueous infusion) extracts only a fraction (~20–40%) of total NDGA content compared to resinous or alcohol-based preparations. **Safety caveat:** Despite bioactive richness, chaparral has been associated with severe hepatotoxicity (over 18 documented cases of liver injury reported to the FDA), and its internal use is strongly cautioned against by most modern clinical authorities.
Chaparral's primary bioactive compound nordihydroguaiaretic acid (NDGA) acts as a potent antioxidant by chelating metal ions and scavenging hydroxyl radicals, preventing lipid peroxidation in cell membranes. Flavonoids like quercetin and kaempferol modulate inflammatory pathways by inhibiting cyclooxygenase and lipoxygenase enzymes. NDGA also disrupts bacterial cell wall synthesis and interferes with viral replication mechanisms.
Most evidence for chaparral comes from in vitro and animal studies, with limited human clinical data available. Laboratory studies have demonstrated NDGA's antioxidant capacity at concentrations of 10-100 μM, showing 60-80% reduction in lipid peroxidation markers. Small preliminary human studies suggest potential antimicrobial effects, but sample sizes were under 50 participants. The FDA has issued warnings about chaparral due to hepatotoxicity reports, limiting clinical research development.
Chaparral has been associated with severe hepatotoxicity, with over 18 documented cases of liver damage leading to FDA warnings. The herb may interact with medications metabolized by cytochrome P450 enzymes, particularly affecting drugs processed through CYP1A2 and CYP2E1 pathways. Contraindicated during pregnancy and breastfeeding due to potential teratogenic effects and lack of safety data. Common side effects include nausea, abdominal pain, and elevated liver enzymes even at low doses.
