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Small Flowered Willow Herb tea is also recommended for treating urinary tract infections in women. In one study, both the large-flowered willow herb (Epilobium angustifolium) and small-flowered willow herb E. parviflorum were found to reduce inflammatory prostaglandins in the carrageenin-induced rat paw edema test; in this study, E. angustifolia was found to be 5 times more powerful than E. parviflori. Antimicrobial screening of 13 phenolic substances and 29 extracts prepared from Finnish plant materials against selected microbes found that small flower willow herb (Epilobium angustifolium L.) was one of the most active plant extracts tested against bacteria.
Chemically, the plant contains an abundance of phenolic compounds, tannins and flavonoids, many of which appear to have biological activity. Willowherb extracts possess antimicrobial effects against a number of bacteria, including recently discovered activity of the Willowherb extract, along with isolated constituents, against the bacteria, Propionibacterium acnes. Myricetin 3-0-glucuronide has been identified as one of the anti-inflammatory components of willowherb. A special elagitannin, oenothein B, is present in the plant and appears to be an active anti-inflammatory component. The reported anti-cancer activity of willowherb extract may be related to the content of oenothein B, which has been found to exhibit potent anti-tumor properties, as well as cause inhibition of the 5-alpha-reductase enzyme.

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Small Flowered Willow-herb (epilobium parviflorum) 3.5 oz /100mg$14.50
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Small Flowered Willow-herb Extract (2 oz/60ml)$18.50
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This explains the antihyperandrogenic effects that may be useful in the prevention and treatment of BPH, as well it supports the use of the extract in the prevention and treatment of prostate cancer. Scientific research has revealed the potential of oenothein B or similar compounds as useful antiviral and anticancer chemotherapeutic agents. The anti-cancer and analgesic properties of willowherb extract have been the subject of recent investigations, where significant activity has been found.
Botanical Description of Small Flowered Willow Herb
Adult plant:
Flowers light-purple,isolated in the axil of smaller upper leaves, 6-9 mm in diameter, petals 3-9 mm long, sepals equalling 2/3 of the length of petals. Stigmas with 4-crossed lobes.