Cinchona (Cinchona officinalis)

Cinchona officinalis is a South American tree bark containing quinine alkaloids that block sodium channels and interfere with plasmodium parasites. The bark demonstrates antimalarial properties and potential antioxidant activity through its quinoline alkaloid content.

Origin & History

Cinchona officinalis is a tree native to the Andean forests of South America, belonging to the Rubiaceae family, with its bark harvested as the primary medicinal source. The bark is dried and extracted using solvents like ethanol or water to isolate alkaloids, primarily through processes involving chromatography or solvent partitioning for purification.

Historical & Cultural Context

Cinchona bark has been used for centuries in Peruvian and South American traditional medicine, primarily as an antimalarial febrifuge, and was adopted by Jesuits in the colonial period. Introduced to Europe in the 17th century as 'Peruvian bark' for treating malaria, it remains a flavor component in beverages today.

Health Benefits

• Antimalarial effects through quinine content (traditional use, lacks modern clinical evidence) • Potential antioxidant activity (preclinical evidence only, DPPH IC50 <50 μg/mL) • May reduce heart palpitations through quinine's sodium channel effects (limited evidence) • Traditional use for muscle relaxation (no clinical evidence available) • Historical use for fever reduction as febrifuge (traditional evidence only)

How It Works

Cinchona's primary bioactive compounds are quinine alkaloids that block voltage-gated sodium channels in cardiac and skeletal muscle. Quinine interferes with plasmodium parasite DNA replication and disrupts their food vacuole function. The bark's phenolic compounds contribute antioxidant activity through free radical scavenging mechanisms.

Scientific Research

The research dossier indicates a lack of specific human clinical trials, RCTs, or meta-analyses for Cinchona officinalis itself, with no PubMed PMIDs provided. Current evidence is primarily preclinical or historical, with modern uses for conditions like cancer, muscle cramps, or varicose veins lacking good scientific evidence from human trials.

Clinical Summary

Modern clinical evidence for cinchona is extremely limited, with most antimalarial research focusing on isolated quinine rather than whole bark extracts. Preclinical studies show antioxidant activity with DPPH IC50 values below 50 μg/mL in laboratory assays. Traditional use studies lack placebo controls and standardized dosing protocols. No recent randomized controlled trials have evaluated cinchona bark supplements for any health condition.

Nutritional Profile

Cinchona bark (Cinchona officinalis) is not consumed as a conventional food source; its profile is dominated by bioactive alkaloids rather than macronutrients. Alkaloid content: Total alkaloids 3–15% dry weight of bark, with quinine comprising 3–7% dry weight (approximately 30–70 mg/g dried bark), quinidine 0.5–1.5% dry weight, cinchonine 0.5–1.0% dry weight, and cinchonidine 0.3–0.8% dry weight. Quinine bioavailability via oral ingestion is approximately 76–88% absorbed in the gastrointestinal tract, with peak plasma concentration reached in 1–3 hours. Polyphenolic compounds: Quinovic acid glycosides present at approximately 1–3% dry weight; tannins (primarily condensed tannins/proanthocyanidins) at 2–4% dry weight, contributing to the noted antioxidant activity (DPPH IC50 <50 μg/mL). Carbohydrates: Bark contains structural polysaccharides (cellulose, hemicellulose) comprising approximately 40–50% dry weight, but these are not bioavailable for nutrition. Quinovin (a bitter glycoside) present at trace levels (~0.5% dry weight). Minerals: Limited data; bark material contains trace calcium (~200–400 mg/100g dry weight estimated), potassium (~150–300 mg/100g), and magnesium (~50–100 mg/100g), though these are not nutritionally relevant at typical medicinal doses. Protein: Negligible (<2% dry weight). Fat: Negligible (<1% dry weight). Fiber: Not nutritionally applicable given non-food use. Volatile oils: Present at <0.5% dry weight. Note: Cinchona is used medicinally in very small doses (bark extracts, tinctures, tonic water trace amounts ~83 mg quinine/liter); it is not a dietary staple, and macronutrient data is largely irrelevant to its application.

Preparation & Dosage

No clinically studied dosage ranges for Cinchona officinalis extracts, powders, or standardized forms are available as human trials are not specified. Bark contains total alkaloids at 6-15% with quinine at 5-16% in some varieties, but standardization is not linked to clinical dosing. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Artemisia annua, Cat's claw, Andrographis, Willow bark, Feverfew

Safety & Interactions

Cinchona can cause cinchonism (tinnitus, headache, nausea) at doses above 2-4 grams daily due to quinine content. It may interact with warfarin, increasing bleeding risk, and can potentiate digoxin toxicity. Contraindicated in pregnancy due to potential uterine stimulation and in individuals with G6PD deficiency. May cause dangerous arrhythmias in people with heart conditions.