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Нашёл более научное описание кипрея:

 

Therapeutic properties of Epilobium extracts have been described in various pharmacological studies.

Traditional use of fireweed includes an infusion or tea, which has been reported as a treatment for migraine headaches, insomnia, anemia, delirium tremens, infections, and colds.

Epilobium angustifolium extracts have been reported to be effective treatments for gastric ulcer; duodenal ulcer; gastritis; colitis; various gastrointestinal disorders, such as dysentery and diarrhea; and prostate or urinary problems, such as urethral inflammation, micturition disorders, prostatic adenoma, and benign prostatic hyperplasia.

Epilobium angustifolium has also been used topically as a cleansing, soothing, antiseptic, and healing agent to treat minor burns, skin rashes, ulcers, and infections, and for treatment of inflammation of the ear, nose, and throat.

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Epilobium angustifolium (a.k.a. fireweed) is a medicinal plant widely used in traditional medicine.

Extracts from this plant represent a rich source of biologically active polyphenols, such as oenothein B and its metabolites. These polyphenols are responsible for many of the biological responses that contribute to the therapeutic potential of fireweed extracts in a variety of diseases.

The therapeutic effects of fireweed polyphenols are mediated by multiple mechanisms, including direct killing of cancer cells and microbes, antioxidant activity, metal chelation, and both pro- and anti-inflammatory immunomodulation.

Although oenothein B is the predominant polyphenol in E. angustifolium responsible for many of its therapeutic properties, its putative receptor and downstream signal transduction pathways are not well understood and will require further research to elucidate.

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Although fireweed extract and its components appear to be relatively safe, further clinical studies are also clearly necessary to assess potential adverse effects and interactions with other drugs, as is normally performed for conventional medicines.

В общем, наука говорит, что кому надо, можно употреблять - но осторожно, ибо не всё изучено.