From wikipedia..
Plant pharmacological studies have suggested that Calendula extracts have anti-viral, anti-genotoxic, and anti-inflammatory properties in vitro.[5] Inherbalism, Calendula in suspension or in tincture is used topically for acne, reducing inflammation, controlling bleeding, and soothing irritated tissue.[6][7]There is limited evidence that Calendula cream or ointment is effective in treating radiation dermatitis.[8][9] In a randomized study of 254 radiation patients, topical application of 4% calendula ointment resulted in far fewer occurrences of Grade 2 or higher dermatitis than occurred in the group using trolamine. Calendula users also experienced less radiation-induced pain and fewer breaks in treatment.[10]
Calendula has been used traditionally for abdominal cramps and constipation.[11] In experiments with rabbit jejunum the aqueous-ethanol extract ofCalendula officinalis flowers was shown to have both spasmolytic and spasmogenic effects, thus providing a scientific rationale for this traditional use.[11] An aqueous extract of Calendula officinalis obtained by a novel extraction method has demonstrated anti-tumor (cytotoxic) activity and immunomodulatory properties (lymphocyte activation) in vitro, as well as anti-tumor activity in mice.[5]
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