Hydrangea root, Hydrangea arborescens, is valued as a kidney antiseptic and often used for treatment of mild kidney and bladder problems. In 2009, researchers published in "Science" that the root of Hydrangea contains halofuginone, an active ingredient fighting autoimmune disorders, such as scleroderma, while still allowing the immune system to function normally.
Hydrangea root is used in a variety of forms including powder, liquid extract, syrup, tincture and tea. Recommended doses include the following: 2 to 4g dried hydrangea root three times per day; 2 to 4 ml liquid extract three times per day; 2 to 10 ml hydrangea tincture three times per day; and 2 to 4 tsp dried hydrangea root steeped in a cup of boiling water for 10 to 15 minutes three times per day, according to Health.com.
Pregnant or breastfeeding women should not use hydrangea root medicinally. Discuss hydrangea treatment with a qualified health practitioner prior to its use.