Cranesbill

BotanicalBest taken away from food

What is it

Cranesbill (Geranium maculatum), also called American cranesbill or wild geranium, is a perennial herb whose root has been used traditionally for astringent purposes due to its tannin content.

Evidence for 1 use

AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.

Mild diarrhea / mucous membrane irritation (traditional)

Mixed Evidence

Use is based on tannin-driven astringent action and traditional herbalism. Controlled human trials specifically on cranesbill root are not available.

How it works

The root is rich in hydrolyzable and condensed tannins, which precipitate proteins and form a temporary protective layer on mucous membranes and skin. This astringency is the basis for traditional use in mild diarrhea, mouth and throat irritation, and minor topical bleeding. In supplement form, the tannins also bind to dietary proteins and minerals in the gut, which may reduce their absorption when taken at the same time.

Dosage

There is no established RDA. Traditional herbal use ranges from roughly 1-2 g of dried root or equivalent extract, taken short-term. DSLD does not provide a median dose for this entry. Follow product directions.

When and how to take it

No established timing baseline. Traditional preparations are taken short-term, typically between meals to limit interference with mineral absorption.

1 commercial form

Compare the main delivery options and what they’re best suited for.

Cranesbill root powder / dry extract

Root powder, dry extract, and glycerite liquid extracts are the common supplement forms.

Tannins act locally in the GI tract; systemic absorption is limited.

Safety

Generally well tolerated short-term in moderate amounts. High-tannin intake can cause stomach upset, nausea, and constipation, and chronic high-dose intake may affect liver function. Not recommended for long-term continuous use.

Who should be cautious

Avoid in pregnancy and breastfeeding due to lack of safety data. Caution in iron-deficiency anemia (may reduce iron absorption), chronic GI conditions, and liver disease.

Interactions

Tannins can bind iron and other minerals as well as some medications, potentially reducing absorption. Separate dosing from minerals and oral drugs by at least 2 hours.

Frequently asked questions

What is cranesbill used for?⌄

Traditionally for mild diarrhea, mouth sores, and minor topical bleeding because the tannins are astringent. Modern clinical evidence is minimal.

Can I take it daily long-term?⌄

Long-term continuous use of high-tannin herbs is not recommended. Use short-term and as directed.

References

Cranesbill on Wikidata — Wikidata link

Cranesbill on NIH DSLD (US supplement label database) — NIH Dietary Supplement Label Database link

Research on Cranesbill (PubMed search) — PubMed link

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Evidence-based·How we grade evidence

Disclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.