Beetroot juice supplies dietary nitrate that may support exercise efficiency, but benefits vary and concentrated products require sensible use.
Beetroot juice has become a familiar sight in endurance-sport nutrition. Its appeal comes from dietary nitrate, which the body can convert through a series of steps into nitric oxide—a molecule involved in blood-vessel function and muscle efficiency.
A 2026 systematic review and meta-analysis examined beetroot juice and dietary nitrate supplementation in swimming. The wider evidence suggests that nitrate may improve exercise efficiency or performance in some settings, but results depend on the sport, dose, training status and testing method.
Who Might Notice a Difference?
Recreational athletes may sometimes respond more clearly than highly trained competitors, whose diets and physiology may already be optimised. A small change can matter in competition, but it may be difficult for an everyday exerciser to distinguish from normal variation.
Timing also matters. Athletes commonly use nitrate-rich products before exercise, but commercial “shots” vary in concentration. Ordinary beetroot, leafy greens and other vegetables can contribute nitrate as part of a healthy diet, though their content is less predictable.
Using antibacterial mouthwash around the time of nitrate consumption may interfere with oral bacteria involved in its conversion. That does not mean people should neglect dental care; it illustrates why supplement effects are more complex than a single ingredient.
Safety and Expectations
Beetroot can temporarily turn urine or stool pink or red, which is usually harmless. Some people experience stomach discomfort. Anyone with low blood pressure, kidney concerns, recurrent kidney stones or medicines affecting blood pressure should seek professional advice before using concentrated products.
No supplement replaces training, sleep, hydration and sufficient carbohydrate for demanding sessions. A runner or swimmer should test any product during normal training rather than trying it for the first time on competition day.
Beetroot juice may provide a modest advantage for some athletes, but marketing claims should be treated cautiously. The most reliable performance gains still come from progressive training and adequate recovery.
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