Rauvolfia (Rauvolfia serpentina)

Rauvolfia serpentina is not consumed as a food or nutritional supplement in the conventional sense; it is a medicinal herb valued exclusively for its bioactive alkaloid content rather than macronutrient or micronutrient contribution. Primary Bioactive Alkaloids (root bark): • Reserpine: ~0.1–0.2% of dry root weight (most pharmacologically significant; indole alkaloid responsible for antihypertensive and tranquilizing effects; bioavailability ~50% orally with extensive first-pass hepatic metabolism; long biological half-life of 50–170 hours due to tight binding to vesicular monoamine transporter VMAT2) • Ajmaline: ~0.2–0.4% of dry root weight (antiarrhythmic alkaloid; class Ia sodium channel blocker; moderate oral bioavailability ~20–30%) • Ajmalicine (Raubasine): ~0.3–0.5% of dry root weight (cerebrovascular vasodilator; alpha-1 adrenoreceptor antagonist; moderate bioavailability) • Serpentine: ~0.1–0.3% of dry root weight (indole alkaloid with sedative properties) • Yohimbine: trace to ~0.05% (alpha-2 adrenoreceptor antagonist; high oral bioavailability ~33%) • Deserpidine: trace amounts (~0.01–0.05%; structurally related to reserpine with similar but milder activity) • Rescinnamine: ~0.05–0.1% (antihypertensive alkaloid, less potent than reserpine). Total alkaloid content of dried root: approximately 1.0–3.0% by weight, with over 50 distinct indole and indoline alkaloids identified. Other Bioactive Compounds: • Phytosterols (β-sitosterol, stigmasterol): trace amounts • Oleic acid and other fatty acids in seed oil: minor quantities • Tannins: present in root bark (~1–2%) contributing to astringent properties • Phenolic compounds and flavonoids: minor concentrations (~0.1–0.5% total phenolics as gallic acid equivalents) providing modest antioxidant activity. Micronutrients (root): • Iron: ~5–15 mg/100g dry weight • Calcium: ~50–120 mg/100g dry weight • Potassium: ~200–400 mg/100g dry weight • Magnesium: ~30–80 mg/100g dry weight (Note: micronutrient values are approximate and vary significantly with soil conditions, geography, and harvest time; these are not therapeutically relevant as dosing is in milligram quantities). Macronutrients: Not applicable — typical Ayurvedic dosing of root powder is 50–200 mg/day, rendering caloric, protein, fat, carbohydrate, and fiber contributions negligible. Bioavailability Notes: Reserpine is lipophilic and readily crosses the blood-brain barrier, which accounts for its central nervous system effects. Whole-root preparations in Ayurveda (churna, decoction) deliver the full alkaloid spectrum at lower individual concentrations compared to isolated reserpine, potentially reducing adverse effects while providing synergistic activity among multiple alkaloids. The presence of tannins in crude preparations may partially reduce alkaloid absorption. Traditional administration with warm water or milk (anupana) is believed to enhance absorption. Alkaloid extraction efficiency is significantly higher in hydroalcoholic preparations (~70–85%) compared to aqueous decoctions (~30–50%).