A lot of supplements make claims about effects that are not immediately, if ever, observable. This is not one of them. When I first started taking this, I immediately noticed that I could go longer during cardio/strength oriented routines such as P90x and Insanity. I continued to drink this as my workouts evolved to running and weight lifting. Despite always being a terrible runner (I simply never felt that "runner's high", was never able to run very far, and was usually miserable) my runs, while never really increasing too far in distance, seemed to require less effort, making them more tolerable.
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