An astringent is a substance that causes constriction of mucous membranes and exposed tissues, usually by precipitating proteins. This action has the effect of producing a barrier on the mucus or exposed surfaces.
How Astringents Work
Astringent herbs often contain tannins. Tannins are chemicals that cause the precipitation of proteins in the body tissues, creating a drying effect.
Astringents are often called haemostatics or styptics when used externally, where they help to stop bleeding and aid the healing process.
They are used extensively in herbal medicine to help dry up secretions and create a barrier against infection. They are used topically as eyewashes, mouthwashes, douches and enemas.
Herbs and supplements that are high in tannin content form precipitates with iron and proteins reducing absorption if taken at the same time. For this reason, herbal formulae containing high levels of tannins should be taken away from meals.
- Balch, J.F. & Stengler, M. (2004). Prescription for Natural Cures: a self-care guide for treating diseases and health problems with natural remedies including diet and nutrition, herbal medicine, nutritional supplements, bodywork, and more. John Wiley & Sons, Inc
- Bone, K. (2003). A clinical guide to blending liquid herbs. St. Louis, MO: Churchill Livingstone
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