The way deer sense smell is so complex we can't even imagine what it's like. Let's imagine that you could kill all the scent on your body, you will simply produce more through your breath and sweat. Doesn't matter how much scent killer you apply, if you're up wind they will smell you. The ONLY way to combat the deer's nose is by being down wind. You can find many hunters that have killed dozens of deer without ever spending a penny on scent killer.