Sodium Bicarbonate for Performance: Does Baking Soda Really Work?

If you've spent any time in the endurance or sports performance world, you've probably heard athletes talk about taking baking soda before a race or workout.

It sounds strange, but the science behind it is surprisingly strong.

In fact, sodium bicarbonate, commonly known as baking soda, is one of the most extensively researched performance supplements available. It has been studied in cyclists, runners, rowers, swimmers, combat athletes, team sport athletes, and strength-power competitors for decades.

But does it actually improve performance?

A comprehensive review published in the Journal of the International Society of Sports Nutrition examined the available evidence and concluded that sodium bicarbonate can enhance performance in many types of high-intensity exercise.

Here's what the science says.

What Is Sodium Bicarbonate?

Sodium bicarbonate (NaHCO₃) is a naturally occurring compound that acts as a buffer.

Its primary role in the body is helping maintain acid-base balance.

During intense exercise, your muscles produce large amounts of hydrogen ions (H+). As these hydrogen ions accumulate, muscle pH declines and the environment inside the muscle becomes more acidic.

This increase in acidity has been associated with several mechanisms that contribute to fatigue, including impaired enzyme activity, reduced calcium sensitivity, and decreased force production.

The idea behind sodium bicarbonate supplementation is simple:

Increase the body's buffering capacity so hydrogen ions can be removed from working muscles more efficiently.

How Does Sodium Bicarbonate Work?

After ingestion, sodium bicarbonate increases blood bicarbonate concentration and blood pH, creating a state known as metabolic alkalosis. This increases the gradient for hydrogen ions to move from muscle cells into the bloodstream.

The review explains that this enhanced buffering capacity likely increases hydrogen ion and lactate transport out of muscle cells through monocarboxylate transporters (MCT1 and MCT4). This helps maintain a more favorable intramuscular environment during intense exercise.

In practical terms:

• Fatigue may occur later
• Muscles can maintain force production longer
• Athletes may sustain higher intensities
• Performance may improve during hard efforts

Research has also shown that sodium bicarbonate may help preserve intramuscular pH and support higher rates of glycolysis and ATP production during exercise.

What Types of Exercise Benefit Most?

One of the most important findings from the review is that sodium bicarbonate is not equally effective for every activity.

Researchers concluded that the greatest benefits occur during exercise that:

• Relies heavily on glycolytic energy production
• Produces substantial hydrogen ion accumulation
• Lasts roughly 30 seconds to 12 minutes

Examples include:

• 400m to 5000m running events
• Track cycling
• Rowing
• Swimming events
• High-intensity interval training
• CrossFit-style workouts
• Combat sports
• Repeated sprint activities

The review notes that sodium bicarbonate is generally less effective for very short maximal efforts lasting under 30 seconds and for prolonged low-intensity endurance exercise where acidosis is not a major limiting factor.

Why It Matters for Endurance Athletes

While sodium bicarbonate is often associated with short-duration events, many endurance athletes may also benefit.

Events such as:

• 5K races
• 10K races
• Cycling time trials
• Hill climbs
• Finishing sprints
• High-intensity intervals

all involve periods where acid accumulation contributes to fatigue.

By helping maintain acid-base balance, sodium bicarbonate may allow athletes to sustain a harder effort for longer before fatigue becomes limiting.

What Does the Research Say?

The authors reviewed decades of research and found that sodium bicarbonate consistently produces small but meaningful performance improvements in many high-intensity exercise settings.

While the average improvement may seem modest, even a 1–3% increase in performance can be substantial for competitive athletes.

For example:

• A 1% improvement in a 40-minute cycling time trial equals roughly 24 seconds.
• A 1% improvement in a 5K race could mean 15–30 seconds.
• In elite competition, these margins can separate podium finishes from the middle of the pack.

Importantly, sodium bicarbonate is one of the few supplements recognized by major sports nutrition organizations as having strong evidence supporting its ergogenic effects.

How Much Should You Take?

The review identified approximately 0.2–0.3 grams per kilogram of body weight as the most commonly studied effective dose.

For a 70 kg (154 lb) athlete, this equates to:

• 14–21 grams of sodium bicarbonate

Most studies administer sodium bicarbonate 60–180 minutes before exercise, although individual responses vary considerably.

Because peak bicarbonate concentrations can differ between athletes, experimenting during training rather than race day is highly recommended.

The Biggest Downside: Gastrointestinal Distress

If sodium bicarbonate has a reputation among athletes, it's probably because of its side effects.

Common complaints include:

• Stomach discomfort
• Bloating
• Nausea
• Diarrhea
• Urgent bathroom trips

The review notes that gastrointestinal distress is the most common limitation to sodium bicarbonate supplementation.

Fortunately, several strategies may reduce side effects:

• Consuming it with food
• Splitting the dose into multiple servings
• Using capsules instead of mixing powder in water
• Testing protocols during training

Is It Worth Trying?

For athletes competing in events where high-intensity efforts play a major role, sodium bicarbonate may be one of the most effective legal supplements available.

The strongest evidence exists for activities lasting approximately 30 seconds to 12 minutes, where metabolic acidosis contributes significantly to fatigue.

However, it's not a magic bullet.

Training quality, nutrition, sleep, recovery, hydration, and race execution will always have a greater impact on performance.

Think of sodium bicarbonate as a tool that may help you squeeze out a little extra performance when everything else is already dialed in.

The Bottom Line

Sodium bicarbonate is one of the most extensively researched sports supplements available. Scientific evidence suggests it can improve performance during many types of high-intensity exercise by increasing the body's buffering capacity and helping remove fatigue-inducing hydrogen ions from working muscles.

The greatest benefits appear to occur during exercise lasting approximately 30 seconds to 12 minutes, where metabolic acidosis becomes a major contributor to fatigue.

While gastrointestinal side effects remain a challenge for some athletes, sodium bicarbonate continues to be one of the most evidence-based ergogenic aids available for improving high-intensity exercise performance.

References

1. Grgic J, Pedisic Z, Saunders B, et al. International Society of Sports Nutrition Position Stand: Sodium Bicarbonate and Exercise Performance. Journal of the International Society of Sports Nutrition. 2021;18:61.
2. Carr AJ, Hopkins WG, Gore CJ. Effects of acute alkalosis and acidosis on performance: a meta-analysis. Sports Medicine. 2011;41(10):801-814.
3. Peart DJ, Siegler JC, Vince RV. Practical recommendations for coaches and athletes: a meta-analysis of sodium bicarbonate use for athletic performance. Journal of Strength and Conditioning Research. 2012;26(7):1975-1983.
4. Heibel AB, Perim PHL, Oliveira LF, McNaughton LR, Saunders B. Time to optimize supplementation: modifying factors influencing the individual responses to extracellular buffering agents. Frontiers in Nutrition. 2018;5:35.
5. McNaughton LR. Sodium bicarbonate ingestion and its effects on anaerobic exercise of various durations. Journal of Sports Sciences. 1992;10(5):425-435.