sodium bicarbonate: the buffer that can make you faster

Cycling performance is often about producing more power.

But sometimes, the limiting factor isn't how much power your muscles can produce.

It's how long you can sustain it.

When intensity rises, your muscles produce large amounts of hydrogen ions (H⁺), contributing to the drop in muscle and blood pH associated with intense exercise.

Your body already has sophisticated systems to manage this.

But there is a way to increase one of them.

Sodium bicarbonate.

Better known as baking soda, sodium bicarbonate can increase the bicarbonate concentration in your blood and improve the body's ability to buffer the acid load associated with high-intensity exercise.

It doesn't give you more energy.

It helps you tolerate high intensity for longer.

And that makes it particularly interesting for cyclists.

What actually happens when intensity goes up?

During high-intensity exercise, glycolytic energy production increases dramatically.

This contributes to the production and accumulation of hydrogen ions.

As the acid-base disturbance increases, muscle contractile function and metabolic processes can become progressively compromised.

The body responds by moving H⁺ out of the working muscle and buffering it in the blood.

This is where bicarbonate becomes interesting.

When you ingest sodium bicarbonate, blood bicarbonate concentration and pH increase.

This creates a larger extracellular buffering capacity.

In simple terms:

More bicarbonate outside the muscle → greater ability to deal with H⁺ leaving the muscle.

A meta-analysis found that sodium bicarbonate significantly increases blood bicarbonate, pH and base excess, while its main metabolic effects appear to be related to high-intensity/glycolytic exercise rather than simply increasing aerobic capacity.

It is not magic.

It is chemistry.

So, does it actually make you faster?

The evidence says yes — under the right conditions.

A systematic review and meta-analysis of cycling time-trial studies found that acute sodium bicarbonate supplementation improved both mean power and performance time compared with placebo. The effect was particularly evident when ingestion was individualized according to the athlete's time to peak bicarbonate.

And the results are not limited to laboratory sprint tests.

In trained cyclists, 0.2 and 0.3 g/kg of sodium bicarbonate both improved performance in a 4 km cycling time trial, with roughly 8–9 seconds saved compared with placebo in that study.

More recently, a study using 0.3 g/kg in a carbohydrate hydrogel found an improvement of approximately 54 seconds in a 40 km cycling time trial.

The important point is not the exact number.

The important point is that the effect can translate into real cycling performance when the exercise is sufficiently intense.

But this isn't a supplement for every ride

This is probably the most important distinction.

Sodium bicarbonate isn't something you need for your easy endurance ride.

Its potential benefit is greatest when a significant portion of the performance depends on high glycolytic energy production and the ability to sustain very high intensity.

Think about:

• 1–5 minute maximal efforts

• repeated VO₂max intervals

• attacks

• steep climbs

• breakaway efforts

• criteriums

• track cycling

• short time trials

• final kilometres of a race

• repeated hard accelerations

• prolonged efforts close to maximal sustainable intensity

The evidence base is particularly strong for high-intensity efforts lasting roughly 1–10 minutes, although studies have also demonstrated benefits in longer, hard cycling time trials.

For a three-hour Zone 2 ride?

Probably not where your money should go.

For the final 10 minutes of a hard race?

Much more interesting.

How much should you take?

The most commonly studied acute protocol is:

0.2–0.3 g/kg of body mass

with 0.3 g/kg generally considered the optimal single dose in the ISSN position stand. Doses of 0.4–0.5 g/kg do not appear to provide additional benefit consistently and are associated with more gastrointestinal side effects.

For example:

So an 80 kg cyclist would typically be looking at approximately 16–24 g, depending on the protocol.

But there is an important caveat:

Don't make 0.3 g/kg your first experiment on race day.

The biggest problem with bicarbonate isn't usually whether it works.

It's whether your stomach agrees with it.

The price of buffering: your gut

The most common side effects are gastrointestinal:

• bloating

• nausea

• abdominal discomfort

• diarrhea

• stomach fullness

And this is one reason why individualization matters.

You can have the perfect physiological protocol on paper and still have a terrible race if your stomach doesn't tolerate it.

This is also why simply taking more isn't better.

The ISSN position stand identifies 0.3 g/kg as the optimal acute dose in general, while higher doses increase the likelihood and severity of side effects without a clear additional performance advantage.

More bicarbonate does not automatically mean more performance.

When should you take it?

The standard recommendation is approximately:

60–180 minutes before exercise.

But there is a better approach.

Individualize the timing.

Different athletes reach peak blood bicarbonate at different times.

In a study involving trained cyclists, researchers first determined each athlete's individual time to peak bicarbonate and then timed supplementation accordingly. Both 0.2 and 0.3 g/kg improved 4 km time-trial performance.

This is an important concept. Instead of asking:

"When should everyone take bicarbonate?"

Ask:

"When does bicarbonate peak in me?"

That is a much more performance-oriented approach.

Powder, capsules or gel?

This is where practical performance nutrition becomes interesting.

The active ingredient is the same:

NaHCO₃.

The delivery system mainly affects tolerability, convenience and timing.

Powder

The simplest and cheapest option.

But taking a large quantity of sodium bicarbonate dissolved in water can be unpleasant and may cause significant gastrointestinal discomfort in some athletes.

Gel / hydrogel

A more modern delivery method.

A 2024 cycling study used sodium bicarbonate mini-tablets incorporated into a carbohydrate hydrogel and demonstrated improved 40 km time-trial performance with a 0.3 g/kg dose.

This is particularly interesting because it combines supplementation with a familiar endurance-fueling format.

Capsules

Probably the most practical traditional option.

They allow the required dose to be divided into multiple units and avoid having to drink a large, salty bicarbonate solution.

Research has also specifically investigated enteric-coated capsules.

In trained cyclists, both enteric-coated and gelatin-capsule sodium bicarbonate improved 4 km time-trial performance compared with placebo, with no significant performance difference between the two capsule types in that study.

So there isn't a universal winner.

The best format is the one that allows you to reach the effective dose without compromising your gut.

A smarter way to use bicarbonate

If you're considering sodium bicarbonate for racing, don't start with the race.

Test it.

A simple progression could be:

1. Establish tolerance

Start with a lower dose such as 0.2 g/kg.

2. Test the timing

Experiment with ingestion around 90–120 minutes before a hard session.

3. Test your race protocol

Once tolerance is established, evaluate 0.3 g/kg.

4. Find your peak

If you want to optimize the strategy, determine your individual time to peak bicarbonate with appropriate testing.

5. Use it when it matters

Save the strategy for sessions and races where high-intensity performance is actually important.

The goal isn't to take more supplements.

The goal is to create the right physiological environment for the effort you are about to perform.

Bicarbonate vs caffeine vs carbohydrates

These supplements don't do the same thing.

Carbohydrates provide fuel.

Caffeine can influence perception of effort, alertness and exercise performance.

Bicarbonate primarily targets acid-base buffering during high-intensity exercise.

That means bicarbonate shouldn't replace your carbohydrate strategy.

You still need fuel. You still need hydration. You still need sodium. Bicarbonate is an additional layer.

Think of it as another piece of the performance puzzle.

Where bicarbonate becomes really interesting

Imagine the final climb of a race.

You've already been riding for three hours. You have enough carbohydrate available. Your aerobic system is working near its limit. Then the gradient changes. Power jumps from 300 W to 400 W. Then 450 W. Then another acceleration.

This is where the ability to tolerate repeated high-intensity work becomes critical. Bicarbonate doesn't make 450 W easier. It doesn't increase your FTP. It doesn't magically create watts.

Instead, it may help you maintain high-intensity work for longer before fatigue becomes limiting.

That's why the supplement is particularly interesting for riders whose performance is decided by repeated surges rather than steady-state endurance alone.

The takeaway

Sodium bicarbonate is not a universal cycling supplement.

It's a performance tool for specific situations.

The strongest evidence supports acute doses around 0.2–0.3 g/kg, with 0.3 g/kg being the most commonly recommended performance dose. Timing is generally 60–180 minutes before exercise, but individualizing ingestion to the athlete's bicarbonate peak can make the protocol more precise.

And when it comes to delivery?

Capsules, powder and hydrogel can all work.

The best option is the one that lets you achieve the effective dose without destroying your stomach.

Because performance isn't just about producing more watts.

Sometimes it's about finding a way to hold onto them when everything starts to hurt.

Buffer the effort. Push harder. Stay there longer.