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Oak

Also indexed as:Quercus spp.
Oak: Main Image© Steven Foster
Botanical names:
Quercus spp.

Parts Used & Where Grown

Oak trees grow throughout North America. Some species of oak grow around the world, including in China and the Middle East. The bark of the oak tree is used medicinally.

  • Reliable and relatively consistent scientific data showing a substantial health benefit.
  • Contradictory, insufficient, or preliminary studies suggesting a health benefit or minimal health benefit.
  • For an herb, supported by traditional use but minimal or no scientific evidence. For a supplement, little scientific support.

Our proprietary "Star-Rating" system was developed to help you easily understand the amount of scientific support behind each supplement in relation to a specific health condition. While there is no way to predict whether a vitamin, mineral, or herb will successfully treat or prevent associated health conditions, our unique ratings tell you how well these supplements are understood by the medical community, and whether studies have found them to be effective for other people.

For over a decade, our team has combed through thousands of research articles published in reputable journals. To help you make educated decisions, and to better understand controversial or confusing supplements, our medical experts have digested the science into these three easy-to-follow ratings. We hope this provides you with a helpful resource to make informed decisions towards your health and well-being.

This supplement has been used in connection with the following health conditions:

Used for AmountWhy
Canker Sores
Refer to label instructions 1 star[1 star]
Oak is an astringent herb that can be used as a mouth rinse to soothe the pain of canker sores. The herb contains tannins that can bind up fluids and possibly relieve inflammation.
Crohn's Disease
Refer to label instructions 1 star[1 star]
Oak is a tannin-containing herb that may be helpful to decrease diarrhea during acute flare-ups and has been used for this purpose in traditional medicine.
Diarrhea
Refer to label instructions 1 star[1 star]
A tannin in oak has been shown to inhibit intestinal secretion, which may help resolve diarrhea. In Germany oak is recommended to treat mild, acute diarrhea in children.
Eczema
Refer to label instructions 1 star[1 star]
Topical preparations containing calendula, chickweed, or oak bark have been used traditionally to treat people with eczema.
Menorrhagia
Refer to label instructions 1 star[1 star]
Astringent herbs such as oak have been traditionally used for heavy menstruation.

Traditional Use (May Not Be Supported by Scientific Studies)

Oak bark was used traditionally by herbalists to treat hemorrhoids, varicose veins, diarrhea, and cancer. Tannic acid derived from oak trees has a long history of application in tanning hides and making ink.1

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The information presented in Aisle7 is for informational purposes only. It is based on scientific studies (human, animal, or in vitro), clinical experience, or traditional usage as cited in each article. The results reported may not necessarily occur in all individuals. Self-treatment is not recommended for life-threatening conditions that require medical treatment under a doctor's care. For many of the conditions discussed, treatment with prescription or over the counter medication is also available. Consult your doctor, practitioner, and/or pharmacist for any health problem and before using any supplements or before making any changes in prescribed medications. Information expires June 2015.

 
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