Though I try not to get too much into any of the " arguments" for or against any bowhunting gear I do tend to try everything at least once and use those products that I feel cannot " hurt" my chances of taking game. I have used the UV killer product on several occasions with no noticeable change in the way that game perceived me. Do I think it works? Probably to some extent though it may not be as important as the company would like you to think.