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I can’t say that I use much in terms of caffeine to help with my trail running performance, but I do know of people who use caffeine products who have found that it gives them a mental boost as well as an endurance boost, and they swear by using caffeine products, so it for sure does seem to work for some people.
I think caffeine can help with energy and focus during long runs, but it affects everyone differently. I usually feel like using the toilet when I drink too much.