Cranesbill (Geranium maculatum)
What Is Cranesbill?
Cranesbill is listed botanically as Geranium maculatum, a plant of the Geraniaceae family, native to the temperate regions worldwide. The material in circulation is root, rhizome — an underground part, harvested once the plant has drawn its reserves down. Cranesbill is the name in everyday use, while Geranium maculatum is the name that identifies it unambiguously across languages, trade documents and safety literature. Its character is described as strongly astringent, earthy, tannin-rich, which is often how the raw material is checked for quality.
Use of Cranesbill predates its chemical analysis by a long way: earlier records describe it by season, preparation and the part gathered rather than by any constituent, and that practical knowledge is what later study was measured against. Beyond its practical use it carries cultural associations — root energy — deep grounding and stabilization and used by the Meskwaki people for wound healing ceremonies.
Today most searches for Cranesbill come from people reading about wound healing, grounding, energy and oral health, or checking how it sits alongside a medication they already take. The use most often documented in the literature is powerful astringent — high tannin content (10-28%), followed by effective for acute diarrhea and dysentery.
How Does Cranesbill Work?
Cranesbill is not a single active substance. Its chemistry is a mixture, and the fractions that researchers isolate most often are Tannins. Tannins is the fraction most often standardised in extracts, associated in the literature with astringent polyphenols with antimicrobial properties.
Before its chemistry was known, Cranesbill was judged by what it did in the cup: how strongly it brewed, how it tasted, and how little or much was needed. Those notes are why particular preparations survived and others did not.
Published research is limited, leaning on small trials, laboratory work and animal models, and this profile cites 2 sources. Reported findings centre on traditional use extensively documented. Where research exists, it examines powerful astringent — high tannin content (10-28%), effective for acute diarrhea and dysentery and styptic for nosebleeds, gum bleeding, and wounds. These are areas of study, not established outcomes, and results differ by preparation and dose.
How the plant is prepared changes what you actually get. Its constituents move readily into alcohol — so a preparation made in another medium will not carry the same fraction of the plant, which is why traditional recipes specify one over another.
Cranesbill is studied as a whole preparation because isolating one fraction tends to behave differently from the material it was taken out of — a recurring finding across the plant-chemistry literature.
Because these constituents are processed by the same pathways that handle many medicines, Cranesbill is documented as interacting with iron supplements and codeine. That is a question of shared metabolism rather than of potency, and it is the main reason the plant is listed in interaction references at all.
Dose, plant part and growing conditions all shift the constituent profile, so two products carrying the name Cranesbill can differ substantially; this is why reference entries specify root, rhizome and, where they exist, standardisation markers.