Evidence supporting the use of: Tannin
For the body system: Bladder

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Synopsis

Source of validity: Traditional
Rating (out of 5): 2

Tannins are a class of astringent, polyphenolic biomolecules that have been traditionally used in herbal medicine, including for the support of urinary tract and bladder health. The use of tannin-rich plants—such as cranberry, oak bark, and uva-ursi—has a long history in folk medicine for addressing urinary tract infections (UTIs) and for their purported benefits to the bladder. These traditional uses are mainly based on the astringent and antimicrobial properties attributed to tannins, which are thought to help "tighten" mucous membranes and reduce irritation or inflammation in the bladder and urinary tract. However, modern scientific validation specifically linking tannins to improved bladder health or direct support of bladder function is limited. While there is some evidence that certain tannin-containing plants may inhibit the adhesion of bacteria to the urinary tract, most studies focus on the plants as a whole rather than on isolated tannins. Therefore, the use of tannins for bladder support is primarily justified by traditional use, with limited direct scientific research to substantiate these claims. The overall evidence rating is moderate (2 out of 5) due to historical use, but not robustly supported by contemporary clinical trials.

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Products containing Tannin

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