It improves the entire circulatory system. It stops bleeding internally and externally. It can be poured directly on an external wound to stop bleeding, fight infection, and promote healing. It may feel warm, but won't burn the skin.
It should be used with Lobelia for tetanus. It's a great gargle to heal sore throats, including the pain of Strep throat.
It's also great for asthma, Bronchitis, and chest congestion.
If you have a good quality Cayenne in your spice rack, use it. I think you'll prefer it in capsules. ;)