Safe,MinmalSideEff: The active ingredients of arnica are sesquiterpene lactones, such as helenalin and 11,13- dihydrohel-enaline and chamissonolid. Also pinoresinol, epipinoresinol, phillygenin, matairesinol, nortrachelogenin, and nortracheloside (six dibenzylbutyrolactol derivatives).helenalin and dihydrohelenalin, may be responsible for anti-inflammatory and analgesic activity. **[P.S. Never worked for me]**
Answered 8/22/2018
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