The key finding
A comprehensive systematic review examining seven decades of research (1955–2025) analyzed 574 studies on Centaurea, a genus of approximately 700 plant species native to the Mediterranean and Western Asia. Researchers found that these traditionally used plants contain distinct chemical families—particularly sesquiterpene lactones, flavonoids, and phenolic acids—that are associated with antioxidant, antimicrobial, anti-inflammatory, anticholinesterase, and hepatoprotective properties in laboratory settings. The review identified specific molecular features, including α-methylene-γ-lactone structures and hydroxylated phenolics, as key contributors to biological activity, offering a molecular explanation for centuries of empirical medical use across cultures.
What the study looked like
This was a systematic review following PRISMA 2020 guidelines, meaning researchers used a transparent, reproducible search protocol to identify relevant studies. They searched three major scientific databases—PubMed, SciFinder, and Web of Science—retrieving publications spanning 70 years of research. The 574 included studies covered multiple research types: ethnobotanical documentation of traditional uses, phytochemical analyses identifying plant compounds, laboratory experiments testing biological activity in cells and animals, toxicity assessments, and formulation development studies. The review examined the entire Centaurea genus, which contains around 700 species predominantly found across Mediterranean countries and Western Asia, regions where these plants have been used for metabolic disorders, inflammation, liver problems, infections, and neurological conditions since antiquity.
Why researchers think this happened
The authors propose that Centaurea’s therapeutic potential stems from its remarkable chemical diversity, developed through evolutionary adaptation to harsh Mediterranean climates. Sesquiterpene lactones—complex plant molecules with reactive chemical groups—appear to interfere with inflammatory signaling pathways in cells. Flavonoids and phenolic acids act as electron donors, potentially neutralizing harmful free radicals that damage tissues. The anticholinesterase activity observed in laboratory tests suggests certain compounds may slow the breakdown of acetylcholine, a brain chemical depleted in neurodegenerative conditions. Modern analytical techniques including metabolomics and molecular identification tools have revealed that individual Centaurea species contain dozens to hundreds of bioactive compounds working simultaneously—what scientists call polypharmacology. This chemical complexity may explain why these plants address multiple health conditions in traditional medicine systems, as different compound classes target different biological pathways.
How to read this carefully
Despite promising laboratory findings, this review highlights critical gaps that prevent definitive conclusions. The authors note significant heterogeneity in how researchers extracted plant compounds, which assay systems they used to test activity, and how they reported results—making direct comparisons across studies difficult and sometimes contradictory. Most evidence comes from test-tube experiments and animal studies, not human clinical trials, meaning we cannot yet confirm whether effects observed in laboratory settings translate to people. Toxicological data remains incomplete for many species, and the review explicitly states that clinical validation is lacking. Dosage, preparation methods, and specific plant parts used varied widely across studies, further complicating interpretation. The correlation between traditional use and laboratory activity does not establish causation or guarantee safety and effectiveness in humans.
What this means for everyday life
This research helps explain why certain Mediterranean and West Asian cultures have valued Centaurea plants for generations, while simultaneously showing how much we still don’t know. The identification of specific chemical structures responsible for biological activity could eventually guide pharmaceutical development, though that process requires years of additional research including human safety trials and efficacy studies. For now, the findings validate traditional knowledge as a starting point for scientific investigation rather than as ready-to-use medical advice. If you’re interested in ethnobotany or how traditional medicine intersects with modern science, this review demonstrates both the promise and limitations of translating ancient practices into evidence-based medicine. The takeaway is nuanced: these plants contain genuinely interesting compounds worthy of continued research, but standardized protocols and rigorous clinical testing remain necessary before anyone can make evidence-based recommendations about their therapeutic use.