Hydrangea

Botanical

What is it

Hydrangea (Hydrangea arborescens) is a flowering shrub native to North America. Its root and rhizome have a long traditional use in Native American and Eclectic medicine for kidney and urinary support.

Evidence for 1 use

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

Kidney/urinary support (traditional use)

Mixed Evidence

Strong traditional use in Eclectic and Native American medicine for kidney stones and urinary irritation. Modern clinical evidence is essentially absent.

How it works

Hydrangea root contains saponins, flavonoids (hydrangin), and a variety of organic compounds. Traditional uses focus on the urinary system, particularly for kidney stones and bladder irritation. Proposed mechanisms include mild diuresis and possible inhibition of stone formation, but rigorous evidence is lacking. Most knowledge about hydrangea comes from traditional Eclectic medicine literature rather than modern clinical trials.

Dosage

No established RDA. Traditional doses are 1-2 g of dried root as a decoction, or 1-2 ml of tincture, taken 2-3 times daily.

When and how to take it

WHEN: 2-3 times daily during use. HOW: As a decoction or tincture with water; stay well hydrated due to diuretic effect.

2 commercial forms

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

Dried root decoction

Traditional preparation form.

Saponins and water-soluble compounds extracted by simmering.

Tincture

Concentrated liquid extract.

Alcohol-based extract; faster absorption.

Safety

Generally considered safe at traditional doses for short-term use. Side effects can include GI upset and dizziness. Some hydrangea species (notably ornamental varieties) contain cyanogenic glycosides and should not be consumed.

Who should be cautious

Avoid during pregnancy and breastfeeding due to limited safety data. Use only the correct medicinal species; do not use ornamental garden hydrangeas. Caution with kidney disease.

Interactions

Limited data. Possible additive effects with diuretics. Theoretical interaction with corticosteroids.

Frequently asked questions

Can I use hydrangea from my garden?⌄

No. Ornamental hydrangea species can contain cyanogenic compounds and are not safe to consume. Use only medicinal preparations of Hydrangea arborescens from reputable sources.

Can hydrangea dissolve kidney stones?⌄

Traditional claims exist, but rigorous clinical evidence for stone dissolution is absent. Do not rely on it as a primary treatment for kidney stones.

References

Hydrangea on Wikidata — Wikidata link

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

Research on Hydrangea (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.