I've mentioned Celox in a couple of prepping posts and have gotten a few emails wanting to know more about it, where to buy it, how effective is it, etc.
I don't know how effective it is. I have been fortunate enough to have never used it. So far.
The best thing I can do is link you to the home page: http://www.celoxmedical.com/
It can be bought on Amazon and a bunch of different other sites.
I want to stress that while this stuff is wonderful in stemming moderate to severe bleeding, please remember that it is first aid, not a treatment.
Don't get your dumb ass shot or cut up real bad, pour some Celox into it and drive on. Get yourself to a doctor along with the empty package and have them properly clean (very important) and dress the wound.