Estimated reading time: 6 minutes
For decades, baking soda has been known as the white powder sitting quietly in kitchen cabinets, used for baking cookies and freshening refrigerators. Today, researchers are looking at it from a completely different perspective. Emerging evidence suggests sodium bicarbonate—the scientific name for baking soda—may help slow the progression of chronic kidney disease in some patients while also improving athletic performance during high-intensity exercise.
Although baking soda is inexpensive, it should not be viewed as a miracle cure. Like any supplement, its benefits depend on the right dosage, the right individual, and the right situation. Here’s what the latest research says.
Why Does Baking Soda Matter?
Your body carefully regulates blood pH between approximately 7.35 and 7.45. One of the primary systems responsible for maintaining this balance is the bicarbonate buffering system.
Healthy kidneys remove excess acid from the blood. When kidney function declines, acid begins to accumulate, producing a condition called metabolic acidosis. This acidic environment places additional stress on the kidneys, increases muscle breakdown, and may contribute to bone mineral loss.
Sodium bicarbonate acts as an alkaline buffer that helps neutralize excess acid.
Think of it like this.
If your body’s acidity is constantly increasing, your kidneys must work overtime just to maintain balance. Baking soda doesn’t replace kidney function, but it may reduce part of that workload.
Can Baking Soda Help Protect the Kidneys?
Recent research has generated significant excitement among nephrologists.
One randomized clinical trial involving 740 patients with Stage 3 to Stage 5 chronic kidney disease followed participants for 30 months. Patients receiving supplemental sodium bicarbonate experienced approximately a 60% relative reduction in progression toward kidney failure compared with those receiving standard care.
Progression to kidney failure fell from approximately 17% in the standard treatment group to 6.6% in the bicarbonate group.
Researchers concluded that correcting metabolic acidosis reduced the metabolic stress that contributes to worsening kidney disease.
This is an important distinction.
The research does not show that baking soda heals damaged kidneys. Instead, it suggests that restoring normal acid-base balance may help slow further damage in people who already have chronic kidney disease and metabolic acidosis.
For healthy adults with normal kidney function, there is currently little evidence that taking baking soda daily improves kidney health.
What Does the Gut-Kidney Axis Have to Do With It?
Scientists are beginning to understand that kidney health extends beyond the kidneys themselves.
Emerging animal research suggests sodium bicarbonate may strengthen the intestinal barrier, reduce inflammation, and decrease oxidative stress.
Researchers observed:
- Reduced kidney crystal formation
- Lower inflammatory markers
- Improved intestinal barrier integrity
- Increased expression of protective proteins involved in gut function
Although these findings are promising, they come from animal studies. Human research is still needed before these benefits can be confirmed.
How Does Baking Soda Improve Physical Performance?
This is where sodium bicarbonate has some of the strongest scientific support.
The International Society of Sports Nutrition recognizes sodium bicarbonate as one of the few supplements capable of improving high-intensity exercise performance.
During hard exercise lasting roughly 30 seconds to 12 minutes, muscles rapidly produce hydrogen ions.
Those hydrogen ions lower muscle pH and create the familiar burning sensation that eventually forces you to slow down.
Baking soda increases bicarbonate levels outside muscle cells.
This creates a stronger gradient that pulls hydrogen ions out of the muscle more efficiently.
The result?
Less muscle acidity.
Less burning.
More work completed before fatigue.
Research shows the greatest benefits during activities such as:
- Sprinting
- Swimming
- Rowing
- CrossFit
- Combat sports
- HIIT workouts
- Sprint cycling
For endurance activities lasting several hours, the benefits appear much smaller.
What Is the Proper Dosage?
Dosage depends entirely on your goal.
| Goal | Suggested Dose |
|---|---|
| Kidney support (medical supervision only) | 0.1–0.3 g/kg body weight |
| Exercise performance | 0.3–0.5 g/kg body weight |
| Heartburn relief | About 1 teaspoon dissolved in water occasionally |
Example Exercise Dosages
150-pound athlete (68 kg)
- 20–34 grams before competition
200-pound athlete (91 kg)
- 27–45 grams before competition
For athletic performance, the most common recommendation is taking sodium bicarbonate 60–180 minutes before exercise.
Some athletes experience stomach discomfort from large doses.
An alternative approach involves splitting the dose over several days using a loading protocol, which appears to reduce gastrointestinal side effects while still improving buffering capacity.
What Are the Side Effects?
Although baking soda is inexpensive, more is definitely not better.
Possible side effects include:
- Bloating
- Nausea
- Diarrhea
- Stomach cramps
- Increased thirst
- Water retention
- Elevated sodium intake
Because sodium bicarbonate contains significant sodium, excessive intake may not be appropriate for people with:
- High blood pressure
- Congestive heart failure
- Advanced kidney disease
- Liver disease causing fluid retention
It may also affect electrolyte balance by altering sodium, potassium, and magnesium levels.
Hydration becomes especially important when using sodium bicarbonate for exercise.
Should Everyone Take Baking Soda?
No.
Healthy individuals generally receive adequate buffering capacity from a diet rich in fruits and vegetables.
People with chronic kidney disease should never begin sodium bicarbonate supplementation without consulting their nephrologist, since dosing depends on blood bicarbonate levels and overall kidney function.
Athletes may benefit during competitions or particularly demanding workouts, but baking soda should not replace consistent training, quality nutrition, hydration, or recovery.
The Math Behind Better Performance
As I often tell clients, results come from stacking small advantages together.
Suppose baking soda allows you to complete just one additional repetition on four major exercises each workout.
That’s four extra quality repetitions.
Train four days each week.
4 extra reps × 4 workouts = 16 additional high-quality repetitions every week.
Over one year:
16 × 52 = 832 additional productive repetitions.
Those repetitions stimulate more muscle, more strength, and more adaptation.
Sometimes small improvements create large long-term results.
Key Takeaways
- Baking soda helps buffer excess acid in the body.
- Research suggests it may slow chronic kidney disease progression in patients with metabolic acidosis.
- It does not cure or heal kidney disease.
- High-intensity athletes may improve performance by buffering muscle acidity.
- Exercise doses typically range from 0.3–0.5 g/kg taken 60–180 minutes before activity.
- Medical dosing for kidney disease should only occur under physician supervision.
- Gastrointestinal discomfort is the most common side effect.
- Proper hydration and electrolyte balance remain essential.
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Frequently Asked Questions
Can baking soda heal damaged kidneys?
No. Current research suggests it may help slow disease progression in certain people with chronic kidney disease and metabolic acidosis, but it does not repair damaged kidneys.
Does baking soda help build muscle?
Not directly. It helps reduce muscle acidity during intense exercise, allowing athletes to perform more work before fatigue.
Is baking soda safe every day?
Only if recommended by your healthcare provider. Long-term use increases sodium intake and may not be appropriate for everyone.
Can baking soda improve endurance running?
Research suggests the greatest benefits occur during high-intensity efforts lasting between 30 seconds and 12 minutes rather than prolonged endurance exercise.
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