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Witch hazel is an astringent anti-inflammatory compound, produced from the leaves and bark of the North American Witch-hazel shrub (''Hamamelis virginiana''). It is a component of many commercial healthcare products. == Composition and use == The main constituents of the witch hazel extract include calcium oxalate, gallotannins, safrole, as well as chemicals found in the essential oil (carvacrol, eugenol). Witch hazel is mainly used externally on sores, bruises, and swelling. As a hydrosol, it is used in skin care as an astringent and anti-oxidant.〔Steven Foster, (Witch hazel, ''Hamamelis virginiana'', Article and Photos ), Steven Foster Group], retrieved April 14, 2012〕 It is often used as a natural remedy for psoriasis and eczema; in aftershave and in-grown nail applications and to prevent facial sweating and cracked/blistered skin, and for treating insect bites, poison ivy, and hemorrhoids.〔 However, clinical studies supporting its effectiveness for these skin conditions are generally lacking. It is recommended to women to reduce swelling and soothe wounds resulting from childbirth. Evidence is lacking for further reported uses including gastrointestinal maladies (diarrhea, coughing up/vomiting blood), general infections such as colds and the specific infection tuberculosis, as well as eye inflammation, bruising, and varicose veins.〔(Witch Hazel Overview Information ), WebMD, accessed April 14, 2012〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Witch hazel (astringent)」の詳細全文を読む スポンサード リンク
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