Me and my hunting camp buddy joke all the time about the quickest way to get rich is to come up with something that a hunter will think, will help him kill a big buck.
The market is flooded with it.
Some of it is good, but most of it is crap.
However, the one main factor when hunting an animal (non-pedator type), is human scent. A deer has one major defense. His/her nose. As a hunter, you can get "Busted" in many ways. Noise, movement, sticking out like a sore thumb on the side of a tree. But the thing that gives us away more often than not is our scent. We smell like a predator. It's what we are, it's in the way we were designed. Thats why our eyes face forward. (Do a study on it, it's pretty cool, but I am getting off topic).
Anyway. There are all kinds of scent elimination products you can buy. From clothing, to scent killing sprays, to cover scents. The real question is, what actually works. I have attached a link to help you with the scent sprays. It is very un-biased and I believe explains a lot. Hope you enjoy it.
Paul
The Best Way to Inhibit Your Scent | Deer & Deer Hunting | Whitetail Deer Hunting Tips