Chicoric Acid (Phenolic Acid)

Chicoric acid is a phenolic compound primarily found in Echinacea species that demonstrates antioxidant activity through free radical scavenging mechanisms. Despite traditional use for immune support, no clinical trials have established proven health benefits in humans.

Origin & History

Chicoric acid is a phenolic acid compound formed by esterification of tartaric acid with two caffeic acid molecules, naturally occurring in Echinacea species, chicory leaves, and basil. It is extracted using ethanol-water mixtures (optimized at 60% ethanol:40% water) or produced via chemical synthesis from protected tartaric and caffeic acid derivatives.

Historical & Cultural Context

Chicoric acid was first isolated from chicory (Cichorium intybus) leaf decoction in 1958. No specific traditional medicine systems or historical therapeutic uses are documented in the available research.

Health Benefits

• No clinical health benefits documented - no human trials available in the research
• Traditional association with Echinacea species suggests potential immune support (evidence: traditional use only)
• Phenolic acid structure indicates possible antioxidant properties (evidence: theoretical based on chemical class)
• Natural occurrence in medicinal plants like chicory and basil (evidence: botanical presence only)
• No specific health claims can be made based on available clinical research

How It Works

Chicoric acid functions as an antioxidant by donating electrons to neutralize reactive oxygen species and free radicals through its phenolic hydroxyl groups. The compound may interact with inflammatory pathways by potentially modulating nuclear factor-kappa B (NF-κB) signaling, though this mechanism remains theoretical in humans. Its molecular structure allows for metal chelation, which could contribute to its antioxidant capacity.

Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses for chicoric acid were found in the research dossier. The compound lacks clinical evidence despite being isolated from chicory in 1958.

Clinical Summary

Currently, no human clinical trials have specifically evaluated chicoric acid as an isolated compound for any health condition. The available research consists primarily of in vitro antioxidant assays and animal studies examining Echinacea extracts containing chicoric acid. Traditional ethnobotanical use suggests immune-supporting properties, but this evidence lacks scientific validation through controlled human trials. The absence of clinical data makes it impossible to establish effective dosages or quantified health outcomes.

Nutritional Profile

Chicoric acid is a pure phenolic compound (dicaffeoyl-tartaric acid), not a macronutrient source. Molecular weight: 474.37 g/mol. It is a diester of caffeic acid and tartaric acid, containing two caffeic acid moieties linked to a tartaric acid backbone. As an isolated compound, it contains no protein, fat, fiber, vitamins, or minerals. Bioactive concentration in source plants: Echinacea purpurea aerial parts contain approximately 0.5–3.3% chicoric acid by dry weight; chicory (Cichorium intybus) leaves contain roughly 1–4 mg/g dry weight; fresh basil (Ocimum basilicum) contains approximately 14.9–19.3 mg/g dry weight, making it one of the richest dietary sources. In lettuce (Lactuca sativa), concentrations range from 0.5–2.5 mg/g dry weight. Bioavailability is limited due to ester bond susceptibility to intestinal esterases and gut microbiota metabolism; chicoric acid is partially hydrolyzed to caffeic acid and tartaric acid in the gastrointestinal tract before absorption. Plasma bioavailability of intact chicoric acid is low (estimated <5% of ingested dose in animal models); metabolites including caffeic acid and dihydrocaffeic acid are the primary circulating forms detected in human plasma after dietary intake. Antioxidant capacity measured at approximately 3.5–4.2 mmol Trolox equivalents/g by DPPH assay in vitro.

Preparation & Dosage

No clinically studied dosage ranges have been established for chicoric acid in any form. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Echinacea extract, caffeic acid, chlorogenic acid, rosmarinic acid, quercetin

Safety & Interactions

Safety data for isolated chicoric acid is limited due to the lack of human studies. As a component of Echinacea preparations, it appears generally well-tolerated in healthy adults when used short-term. Potential interactions with immunosuppressive medications are theoretically possible given traditional immune-related claims, though no documented cases exist. Pregnant and breastfeeding women should avoid chicoric acid supplements due to insufficient safety data.