How homeopathic Arnica montana has been a literal lifesaver in our first aid kit. It really does seem to work to reduce swelling and bruising. Once an injury occurs, it also appears to promote faster healing.
For those who don't remember Latin roots, here are some common medical prefixes and postfixes. Designed for doctors/nurses in training, but since many of us have to make our own medical decisions, it could be useful for anyone.