From http://www.findhealer.com/glossary/W.php3
"Rich in tannins, white oak bark also provides vitamin B12 and minerals like calcium, iron and zinc. White oak bark's astringent properties tighten tissues and strengthen blood vessels, making it ideal for treating diarrhea, hemorrhoids and varicose veins. The blood-clotting agents active in white oak bark are also helpful to cease nosebleeds."
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