Arnica is a perennial plant with large yellow flowers that is native to Europe and North America. It contains a toxin called helenalin that can be deadly if consumed in large quantities. The FDA warns against using arnica orally or applying it to broken skin. Taking arnica by mouth can cause dizziness, tremors, and heart abnormalities Arnica flowers are used for a variety of purposes, including: Pain relief: Arnica is used to treat pain from muscle aches, joint pain, arthritis, sprains, and bruises. It is used to treat inflammation from insect bites, broken bones, and other conditions. Helps wounds heal. Treat skin conditions. Makes bruises go away faster. Great to make an oil to do a salve with. Not to treat, cure or prevent. Package contains 1/2 cup of herb