Scientific studies are great but the real question is how well does it work for you? For me, it seems to help enough to be a useful part of my FAK. I have never been sorry to use it and a few times wished I had used it sooner. And adding a pain relief component is like frosting on a cake. IMO.
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"The reasonable man conforms himself to the world around him. The unreasonable man conforms the world around him to himself. Therefore, all progress is dependent upon the unreasonable man." Unknown