Sodium Bicarbonate and Exercise Performance: Does Baking Soda Actually Work?

Sodium bicarbonate (NaHCO3, commonly known as baking soda) is the same cheap, widely available kitchen powder that athletes in disciplines requiring short, intense effort — from swimming to rowing to track cycling sprints to combat sports — have used for decades. Unlike many trendy supplements, sodium bicarbonate has several decades of research behind it and solid meta-analyses, making it one of the few supplements whose ergogenic effect is relatively well documented.

The mechanism is based on buffering acidity. During intense anaerobic exercise lasting from tens of seconds to a dozen or so minutes, muscles produce energy mainly through anaerobic glycolysis, a byproduct of which is increasing acidification of the intracellular environment (falling pH) due to accumulating hydrogen ions. This acidification is one of the factors contributing to the feeling of muscle fatigue and reduced capacity for continued work. Raising blood bicarbonate levels through supplementation increases the body's capacity to buffer (neutralize) these hydrogen ions flowing from muscles into the blood, which should theoretically delay fatigue.

This distinction has practical implications: sodium bicarbonate won't help with a single maximal lift at the gym, but it may help maintain rep counts when training to failure in sets involving large muscle groups, and above all in disciplines built on repeated, short, intense efforts (interval sprints, combat sports, rowing, swimming over 100-400 m).

This distinction is worth pairing with what we've written about creatine in our knowledge base — another well-researched ergogenic supplement that works through a completely different mechanism (ATP regeneration in short, repeated efforts) and has a much better gastrointestinal safety profile. The two are sometimes mistakenly treated as interchangeable, though they act on different physiological limitations.

For healthy adults, short-term sodium bicarbonate supplementation at typical ergogenic doses is generally considered safe, aside from the risk of gastrointestinal distress described above. There are, however, groups that should exercise particular caution or avoid this supplementation entirely.

Sodium bicarbonate is a rare example of a sports supplement where the problem isn't a lack of evidence for efficacy, but the practical difficulty of using it — the ergogenic effect is real and confirmed by a meta-analysis of nearly 60 studies, but narrowly limited to a specific type of effort (intense, 30 seconds to a dozen or so minutes) and burdened with a high risk of gastrointestinal distress severe enough at times to cancel out the potential benefit.

A sensible approach for athletes in disciplines where the buffering mechanism matters: test the supplementation protocol during training, with a spread-out dose and ideally with a meal, well ahead of any important competition, rather than experimenting for the first time on race day. For recreational trainees or those focused on maximal strength or aerobic endurance, the evidence doesn't justify routine use of this supplement.