Caffeine Makes You Faster… Until It Doesn’t | EP 802

Caffeine is one of the most researched performance aids in sport, but Dr. Neil Clarke says its biggest misconception is that it works the same way for everyone. The research strongly supports caffeine for endurance performance, yet the right dose, timing, and delivery method can vary dramatically from one runner to another. Clarke explains how caffeine can reduce perceived effort and pain, increase motivation, and potentially help athletes sustain performance longer. The conversation covers coffee versus pills, gels and gum, caffeine during ultras, sleep, withdrawal, and why cutting caffeine before a race may not provide the boost many runners expect. For trail and ultrarunners, the most useful takeaway is surprisingly simple: start with a low dose, test it in training, and look for the smallest amount that improves performance without creating side effects. LINKS Dr. Neil Clarke LinkedIn Researchgate BCU Research Profile EPISODE SPONSORS Tifosi Optics - CLARITY ON THE TRAIL: Post your Golden Nugget of wisdom that helps you recover after a huge effort on Instagram, tag @TifosiOptics, @TrailRunnerNation, and use the hashtag #ClarityOnTheTrail. OR try texting us (within the USA) with your tip: 916-235-3928. If we use yours on a weekly episode, you get a pair of the new Sanctum SL glasses! Timestamps 01:01 | The Biggest Caffeine Myth Dr. Neil Clarke explains why caffeine doesn't work the same way for every athlete and why runners need to treat themselves as an experiment of one. 08:33 | Finding the Right Dose The research points toward general dosing guidelines, but genetics, sensitivity, training status, and side effects can dramatically change what works for an individual runner. 10:13 | Coffee, Pills, Gels or Gum? Neil compares common caffeine sources and explains why delivery method can affect how quickly runners feel the benefits. 20:17 | Should You Quit Caffeine Before a Race? The popular strategy of reducing caffeine before race day gets challenged, including the potential downside of withdrawal symptoms. 28:17 | How Caffeine Actually Improves Performance Caffeine can affect motivation, pain perception and perceived effort, helping explain why hard running may feel more manageable. 32:29 | Using Caffeine During an Ultra For a 50K or longer event, Neil discusses starting doses, mid-race top-ups, course timing, and why runners need to test their strategy before race day. 48:26 | Build Your Own Caffeine Strategy Neil finishes with a practical approach: start low, gradually experiment, and find the smallest dose that produces a benefit without unwanted side effects.