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Nutrition

Exogenous Ketones Pre-Workout

Exogenous ketones pre-workout raise blood BHB without fasting—may help easy sessions for some but rarely replace carbs for intervals and often upset the gut.

Exogenous ketones pre-workout are beta-hydroxybutyrate salts or esters swallowed to raise blood ketones without fasting—sometimes blunting perceived effort on easy work but often causing GI distress and costing more than food. They do not replace carbs for high intensity.

Test small doses away from race day.

Common questions

  • Do exogenous ketones improve intervals?

    Evidence for high-intensity gain is weak; carbs still dominate glycolytic work. If used, trial on easy days first and watch nausea and loose stool.

Related guide

Pre-Workout Meal Timing: When and What to Eat Before Training →

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