4. What are the main chemical constituents of Arnica?

The main chemical constituents of Arnica include essential oils, fatty acids, thymol, pseudoguaianolide sesquiterpene lactones, phenolic acids, flavanone glycosides, sesquiterpene lactones like arnicolide, helenaline and dihydro-helenaline, flavonoids like quercetin and quercetin glucosides, alcohols like arnidiol, arnilenediol and isoarnilenediol, carotenoids, inuline and tannins.