Question 1

How does cranesbill geranium work as an astringent?

Accepted Answer

Cranesbill geranium works primarily through its high tannin content, which can reach up to 28% in the root. Tannins bind to proteins in mucous membranes and damaged tissue, creating a protective layer that reduces secretions, tightens tissues, and helps stop bleeding. This astringent action explains its traditional use for diarrhea, wound healing, and ulcers. The gallic acid and ellagic acid also contribute anti-inflammatory and antioxidant effects. Evidence Level: C/Traditional.

Question 2

Does cranesbill geranium interact with any medications?

Accepted Answer

Cranesbill geranium's high tannin content may reduce the absorption of certain medications when taken simultaneously, including alkaloid-based drugs and iron supplements. Tannins can bind to minerals and medications in the digestive tract, potentially decreasing their effectiveness. To minimize interactions, separate cranesbill supplementation from medications by at least 2-3 hours. There is limited clinical data on specific drug interactions, so consult a healthcare provider if taking prescription medications. Evidence Level: C/Theoretical.

Question 3

What is the recommended dosage for cranesbill geranium?

Accepted Answer

The traditional adult dosage for cranesbill geranium root is 2-4 grams prepared as a decoction, taken up to three times daily. For tincture preparations, the typical dose is 2-4 mL three times daily. These doses are based on traditional use and Eclectic medical practice rather than modern clinical trials. Start with lower doses to assess tolerance, as high tannin content may cause nausea in some individuals. Do not exceed recommended amounts without professional guidance. Evidence Level: C/Traditional.

Question 4

Is cranesbill geranium safe during pregnancy?

Accepted Answer

Cranesbill geranium is considered unsafe during pregnancy and should be avoided. The high tannin content and strong astringent properties may stimulate uterine contractions or interfere with nutrient absorption during this critical period. Indigenous and Eclectic medical traditions contraindicate its use in pregnant women, particularly at therapeutic doses. Women who are pregnant or breastfeeding should not use cranesbill preparations. Consult a qualified healthcare provider for appropriate alternatives. Evidence Level: C/Traditional.

Question 5

Can cranesbill geranium help with diarrhea?

Accepted Answer

Cranesbill geranium has a long history of traditional use for treating diarrhea and dysentery, documented among numerous Indigenous tribes including the Menominee and Potawatomi. The herb's high tannin content creates an astringent effect in the digestive tract, helping to reduce excessive fluid secretions and tighten intestinal tissues. While this traditional application is well-documented, modern clinical evidence is limited. Cranesbill should not replace medical treatment for persistent or severe diarrhea. Evidence Level: C/Traditional.

Question 6

What are the side effects of cranesbill geranium?

Accepted Answer

The most common side effects of cranesbill geranium include constipation, particularly with overuse or extended duration of use. The high tannin content may cause nausea, stomach upset, or digestive discomfort in some individuals. Long-term use is not recommended due to potential strain on the liver from tannin metabolism. Discontinue use if constipation or gastrointestinal upset occurs. Those with existing constipation should avoid this herb entirely. Evidence Level: C/Traditional.

Cranesbill Geranium

Sources & Citations

Cinquefoil

Bridelia Ferruginea

Fomes Fomentarius

Summary

Background

Active compounds

Clinical evidence

Evidence summary

PubMed sources

Government sources