Sodium Bicarbonate (Baking Soda)
Oral sodium bicarbonate loading to buffer lactic acid and enhance high-intensity exercise performance
Bottom Line
Sodium bicarbonate is one of the most well-researched and effective ergogenic aids in sports science, with an official ISSN position stand and multiple meta-analyses supporting its use. It works by increasing blood pH (creating metabolic alkalosis), which enhances the body's ability to buffer hydrogen ions produced during high-intensity exercise.
The evidence is strongest for efforts lasting 30 seconds to 12 minutes - think 400m-1500m running, rowing, swimming sprints, cycling time trials, and combat sports. Meta-analyses show consistent improvements in time to exhaustion, peak power, and muscular endurance.
The catch: GI side effects (bloating, nausea, diarrhea) are common and can be performance-ruining. The solution is enteric-coated capsules, taking it with food, or multi-day loading protocols.
If you compete in high-intensity events lasting 1-12 minutes, this is a legal, cheap, proven performance enhancer. Test your protocol in training first - GI tolerance varies hugely between individuals.
Science
The Problem: Acidosis During High-Intensity Exercise
During intense exercise, your muscles produce hydrogen ions (H+) as a byproduct of anaerobic glycolysis. This accumulation of H+ causes: - Decreased muscle pH (acidosis) - Impaired enzyme function - Reduced calcium release for muscle contraction - The "burn" and fatigue that limits performance
How Sodium Bicarbonate Works:
Bicarbonate (HCO3-) is your body's primary extracellular buffer. Supplementing increases blood bicarbonate concentration by ~5-6 mmol/L, creating a state of metabolic alkalosis.
| Before Supplementation | After Supplementation |
|---|---|
| Blood pH ~7.40 | Blood pH ~7.45-7.50 |
| HCO3- ~24 mmol/L | HCO3- ~29-30 mmol/L |
| Normal buffering | Enhanced buffering capacity |
Mechanism of Action:
- Increased blood HCO3- creates a larger H+ concentration gradient
- H+ and lactate are co-transported out of muscle cells faster (via MCT1/MCT4)
- Intramuscular pH maintained closer to optimal
- Glycolytic enzyme function preserved longer
- Fatigue delayed, performance improved
Evidence Summary (ISSN Position Stand):
- Ergogenic for exercise lasting 30 sec to 12 min
- Improves muscular endurance (more reps at given load)
- Enhances peak and mean anaerobic power
- Benefits single and repeated bout exercise
- Works in both men and women
Key Research:
- ISSN Position Stand (2021): Official position supporting use for high-intensity exercise
- Umbrella Review (2021): 8 meta-analyses confirm ergogenic effects
- Carr et al. (2011): Meta-analysis showing 1.7% improvement in performance
What It Doesn't Help:
- Very short efforts (<30 sec) - not enough acid accumulation
- Very long efforts (>12 min) - limited by other factors
- Low-intensity aerobic exercise - no significant acidosis
- Strength/power (1-5 rep max) - not limited by pH
Supporting Studies
9 peer-reviewed studies
View all studies & compare research →Practical Protocol
Acute Single-Dose Protocol (Most Common):
| Parameter | Recommendation |
|---|---|
| Dose | 0.2-0.3 g/kg body weight |
| Timing | 60-180 min before exercise |
| Form | Capsules preferred over solution |
| Food | Take with carbohydrate-rich meal |
Example for 70kg Athlete:
- Dose: 70 × 0.3 = 21g sodium bicarbonate
- Timing: 90-120 min pre-competition
- ~5-6 teaspoons or ~25 capsules (size 00)
Multi-Day Loading Protocol (Better GI Tolerance):
| Day | Daily Dose | Timing |
|---|---|---|
| Day 1-3 | 0.4-0.5 g/kg/day | Split: breakfast, lunch, dinner |
| Competition day | Optional small top-up | 60-90 min before |
Example 3-Day Load for 70kg Athlete:
- Daily: 70 × 0.4 = 28g split into 3 doses (~9g each)
- Take each dose with meals
- Competition day: optional 0.1-0.15 g/kg top-up
Minimizing GI Distress:
- Enteric-coated capsules - Best option, bypasses stomach
- Take with food - Slows absorption, reduces symptoms
- Multi-day loading - Avoids large single dose
- Longer pre-exercise window - 180 min vs 60 min
- Individual testing - Response varies hugely
Form Comparison:
| Form | GI Tolerance | Convenience | Effectiveness |
|---|---|---|---|
| Enteric capsules | Best | Moderate | Full effect |
| Gelatin capsules | Good | Moderate | Full effect |
| Powder in water | Poor | Easy | Full effect |
| Powder with food | Moderate | Easy | Full effect |
When to Use:
- 400m - 1500m running
- 500m - 2000m rowing
- 100m - 400m swimming
- Cycling time trials (1-4 km)
- Combat sports
- CrossFit-style workouts
- High-rep resistance training
- Any maximal effort 30 sec - 12 min
Critical: Test in Training First
Never use a new protocol on competition day. Individual GI response varies dramatically.
Risks & Side Effects
Common Side Effects:
- Bloating (very common)
- Nausea
- Stomach cramps
- Diarrhea
- Vomiting (less common)
- Flatulence
GI Distress Incidence:
- With plain solution: ~50-70% experience symptoms
- With food/capsules: ~20-40% experience symptoms
- With enteric coating: ~10-20% experience symptoms
Serious Concerns:
- Sodium load: A 21g dose contains ~6,200mg sodium (nearly 3x daily recommended limit)
- Cardiovascular risk: Regular high-sodium intake linked to hypertension
- Electrolyte imbalance: Can occur with repeated use
- Alkalosis symptoms: Rare but possible (tingling, muscle cramps)
Contraindications:
- Hypertension (high blood pressure)
- Heart disease
- Kidney disease
- Salt-restricted diet
- Pregnancy
- Children (no established safety)
Drug Interactions:
- May affect absorption of other medications
- Can interact with diuretics
- Consult doctor if on any medications
Risk Mitigation:
- Don't use daily/chronically
- Save for key competitions
- Monitor blood pressure if using regularly
- Stay well hydrated
- Test tolerance before competition
Risk Level: Low-Moderate (if used occasionally for competition)
Who It's For
Ideal Candidates:
- Middle-distance runners (400m-1500m)
- Swimmers (100m-400m events)
- Rowers (500m-2000m)
- Track cyclists (individual/team pursuit)
- Combat sport athletes (wrestling, judo, boxing)
- CrossFit competitors (high-intensity metcons)
May Benefit:
- Team sport athletes (repeated sprints)
- High-rep resistance training
- HIIT enthusiasts
- Anyone in lactate-limited events
Probably Won't Help:
- Sprinters (<30 sec events)
- Marathon/ultra runners
- Powerlifters/strength athletes
- Casual exercisers
Should Avoid:
- Those with hypertension
- Heart or kidney disease
- Severe GI sensitivity
- Anyone on salt-restricted diet
- Those who haven't tested tolerance
How to Track Results
What to Track:
- GI symptoms (type, severity, timing)
- Performance metrics for your event
- Optimal timing for your body
- Form that works best (capsules, solution, etc.)
Performance Metrics:
| Event Type | What to Measure |
|---|---|
| Time trial | Finish time, split times |
| Repeated sprints | Decline in performance across sprints |
| High-rep sets | Total reps at given load |
| Combat sports | Round-by-round output |
GI Symptom Log:
| Time Post-Ingestion | Symptom | Severity (1-10) |
|---|---|---|
| 30 min | ||
| 60 min | ||
| 90 min | ||
| During exercise | ||
| Post-exercise |
Testing Protocol:
- First test: 0.2 g/kg, 120 min before, with food
- If tolerated: Try 0.25 g/kg
- If tolerated: Try 0.3 g/kg
- If GI issues: Try enteric capsules or multi-day loading
- Find your personal optimal protocol
Signs It's Working:
- Ability to maintain higher intensity longer
- Less severe "burn" at end of efforts
- Faster recovery between intervals
- Performance improvement of 1-3%
Top Products
Food-Grade Baking Soda (Budget):
- Arm & Hammer Pure Baking Soda - Cheapest option, proven effective
- Bob's Red Mill Baking Soda - Aluminum-free option
Pre-Made Sports Supplements:
- Nduranz Bicarb - Enteric-coated capsules, designed for athletes
- Maurten Bicarb System - Premium, used by elite athletes
- Beta Alanine + Bicarb combos - Stacked formulas
Empty Capsules (DIY):
- Size 00 Gelatin Capsules - ~500mg per capsule
- Enteric-Coated Capsules - For sensitive stomachs
- Capsule filling machine - Makes DIY faster
What to Look For:
- Food-grade/USP grade baking soda
- Pure sodium bicarbonate (no additives)
- For capsules: appropriate size for your dose
What to Avoid:
- Industrial/cleaning-grade baking soda
- Products with unnecessary additives
- Extremely cheap overseas supplements
Cost Breakdown
Raw Baking Soda:
- Arm & Hammer: ~$3-5 for 1 lb (454g)
- Cost per dose (21g): ~$0.15
- Monthly (8 doses): ~$1.20
Capsules (Empty):
- Size 00 capsules: ~$10 for 500
- Cost per dose: ~$0.50 (including baking soda)
Pre-Made Supplements:
| Product | Price | Doses | Cost/Dose |
|---|---|---|---|
| Nduranz Bicarb | $35 | 40 | $0.88 |
| SIS Beta Fuel + Nootropics | $40 | 20 | $2.00 |
| DIY capsules | $15 | 30 | $0.50 |
| Raw baking soda | $5 | 20+ | $0.15 |
Enteric-Coated (Premium):
- Specialty products: $30-50 for 60-120 capsules
- Cost per dose: $1-2
Cost-Benefit:
Sodium bicarbonate is one of the cheapest ergogenic aids. Even premium enteric-coated options cost less than a cup of coffee per use.
Best Value:
- DIY capsules with food-grade baking soda
- Or plain baking soda mixed into sports drink with food
Recommended Reading
Podcasts
#101 Dr. Andy Galpin: The Optimal Diet, Supplement, & Recovery Protocol for Peak Performance
Practical protocols for nutrition timing, supplement stacking, and recovery optimization that...
2821: Baking Soda Remedies, Sodium Bicarbonate Book, Highly Processed Foods & Addiction, Diet & Hip Fractures (FR)
Dr. Stephen Cabral reviews the book "Sodium Bicarbonate: Nature's Unique First Aid Remedy" by...
Instructions for Boosting Cycling Performance with Sodium Bicarbonate (#219)
Coach Adam Pulford and sports dietitian Kristen Arnold discuss sodium bicarbonate as an...
Sodium Bicarbonate for Cyclists Deep Dive with Dr. Andy Sparks - Ask a Cycling Coach Podcast 482
Coach Jonathan Lee interviews Dr. Andy Sparks, an exercise physiology researcher at Edge Hill...
Discussed in Podcasts
22 curated moments from top health podcasts. Click any timestamp to play.
Study breakdown — creatine vs baking soda vs combo for sprint performance
The host breaks down a 2015 study by Griffin et al. that tested creatine (20g), baking soda (0.3g/kg), their combination, and placebo in nine trained men doing repeated 10-second Wingate sprints. Creatine was most effective; baking soda helped to a lesser degree; the combo showed minimal synergy beyond creatine alone.
"supplement, but baking soda was effective to a lesser degree. However, any synergistic effect"
How baking soda works as an extracellular buffer
The host explains baking soda's mechanism: it creates an alkaline extracellular environment that draws acidic byproducts out of muscle cells, counteracting the acidosis that contributes to fatigue during high-intensity exercise.
"which is the opposite of acidic. So it helps to balance these conditions out. The baking soda is"
Where baking soda really shines — sustained high-intensity efforts
The host argues that 10-second sprints are the wrong test for baking soda. Its real benefit is in sustained 2-3 minute all-out efforts like 800m runs or high-volume bodybuilding sets with short rest periods, where acidosis is the primary performance limiter.
"be helpful for more like that 800 meter run. Um, something that's, you know, two, three minutes in"
US Olympic athletes quietly using baking soda supplementation
The host reveals that a friend working with a US Olympic team found that most athletes on the team were supplementing with sodium bicarbonate, illustrating how elite athletes often rely on basic, inexpensive supplements rather than complex cocktails.
"US Olympic team for a certain particular sport. And if I do remember correctly, they were,"
Why sodium bicarbonate supports pH balance and organ function
Dr. Cabral explains how the body maintains blood pH at 7.356 at its own detriment — pulling calcium from bones and breaking down muscle tissue — and how supplementing with sodium bicarbonate can reduce that burden on kidneys and pancreas.
"your body doesn't have this endless storehouse of things. When your body needs calcium, if you don't have enough calcium in your diet, it pulls it from your bones."
Cabral's morning baking soda and lemon protocol
Cabral shares his personal protocol of half a teaspoon of sodium bicarbonate with lemon juice each morning, explaining the fizzing reaction between the acid and alkalinity and recommending aluminum-free brands like Bob's Red Mill.
"We're going to show a bag of sodium bicarbonate, all right? Sodium bicarbonate, the one that I'm using right now is Bob's Red Milk."
The book that convinced Cabral to try sodium bicarbonate
Cabral recommends the book "Sodium Bicarbonate: Nature's Unique First Aid Remedy" by Dr. Mark Sirkus and explains the wide range of uses for baking soda, from household cleaning to health applications.
"It is an easy-to-read book if you're someone that is wondering why would I ever be recommending baking soda? And the reason is, is that it has the ability to give your body back alkaline buffers."
How sodium bicarbonate buffers muscle acidity during intense exercise
Sports dietitian Kristen Arnold explains the mechanism of action: sodium bicarbonate increases blood alkalinity, allowing the body to clear more hydrogen ions and delay the fatigue that comes from acidosis during high-intensity efforts.
"sodium bicarbonate specifically helps to increase the alkalinity or make your blood more basic. So it creates an extracellular environment in which, when we're exercising, a lot of the fatigue we experience is because we're building up hydrogen ions, and so the sodium bicarb, by increasing alkalinity, we can clear out more of those hydrogen ions and therefore delay fatigue."
Dosing protocol and timing for competition
Arnold lays out the evidence-based dosing protocol: 0.3 grams per kilogram body weight, taken 90 minutes to 3 hours before competition, citing both Asker Jeukendrup's research and the 2021 International Society of Sports Nutrition position stand.
"both Dr Jukendrup and this position statement recommend 0.3 grams of sodium bicarbonate per kilogram body weight is shown to be the amount that is effective and also will be less likely to produce side effects."
8-week training study shows bicarb improves VO2 max and threshold power
They discuss a study by Gabriella Gallo showing that athletes who supplemented with sodium bicarbonate during high-intensity training sessions over 8 weeks saw greater improvements in VO2 max, power at lactate threshold, and time to exhaustion compared to the control group.
"they dosed them for the high-intensity workouts themselves. They didn't dose them for the endurance and what they saw was the bicarb group had an increase in VO2 max post eight-week training program power at LT2, which was basically FTP, and an increased time to task failure"
Safety concerns and who should avoid sodium bicarbonate
Arnold flags important safety considerations: the high sodium load (around 6,000mg per dose), contraindication for those with blood pressure issues, and increased risk for athletes predisposed to kidney stones.
"if you have any kind of blood pressure issues, if you're on blood pressure medication, and also something to consider is if you are at a predisposition for kidney stones. A lot of masters, male athletes, are already predisposed and there is some evidence to suggest I mean, it's just a lot of stress on your kidneys putting this much sodium through filtering it."
The GI problem with sodium bicarbonate and how to solve it
Dr. Andy Sparks explains the key challenge of sodium bicarbonate supplementation — GI distress — and how his research team developed enteric-coated and delayed-release capsules to bypass the stomach, using technology borrowed from the pharmaceutical industry.
"Uh, this is interesting because it seems like the first research that's looking into like different vehicle methods for sodium bicarbonate that's proving that this seems to be beneficial rather than whether you're just dumping a bunch of baking soda and water or if you're just, you know, taking a bunch of the tablets. So Andy, with all that said, I'd like to ask you, first of all, great to have you on. And then secondly, can you explain the problems you were trying to solve with this research? And then we can get into what you observed and everything else. Yeah, thanks very much for the intro. I think it's interesting, this area, because the sort of dynamic and the sort of backstory as to my relationship with Morton was that they originally approached me when I was doing some work in this field anyway. And we had this idea that one of the key problems that you have with delivering bicarbonate to be an ergogenic aid is some of the GI upset that you get."
Who to Follow
Researchers:
- Bryan Saunders, PhD - Lead author on enteric-coated bicarbonate research
- Lars McNaughton, PhD - Extensive bicarbonate research, position stand co-author
- Craig Sale, PhD - Beta-alanine and bicarbonate research
Sports Nutrition Bodies:
- ISSN - Published 2021 position stand supporting use
- IOC - Recognizes as evidence-based supplement
- ACSM - Includes in sports nutrition guidance
Practical Advocates:
- Alex Hutchinson - Science writer, covers bicarbonate in "Endure"
- TrainingPeaks - Publishes practical protocols
Synergies & Conflicts
Classic Stacking:
- Beta-Alanine + Sodium Bicarbonate - Different buffering mechanisms (intracellular + extracellular). Additive effects in some studies.
- Caffeine - Can combine, but may worsen GI issues
- Creatine - Different mechanisms, can stack
- Carbohydrates - Take bicarb with carbs to reduce GI distress
Buffering Stack:
- Sodium bicarbonate (0.3 g/kg pre-event)
- Beta-alanine (3-6 g/day ongoing loading)
- Combined may provide greater benefit than either alone
Race Day Stack:
- Caffeine (3-6 mg/kg) - 60 min pre
- Sodium bicarbonate (0.3 g/kg with food) - 90-120 min pre
- Carbohydrate loading - days before
What to Avoid:
- Don't combine with excessive caffeine (GI stress)
- Avoid other GI-irritating supplements same day
- Don't use with antacids (already alkaline)
Timing Considerations:
| Supplement | Timing |
|---|---|
| Sodium bicarbonate | 90-180 min pre |
| Caffeine | 60 min pre |
| Beta-alanine | Ongoing daily |
| Carbs | Pre + during if >60 min |
What People Say
Elite Use:
Why It's Trusted:
Common Experiences:
Common Complaints:
Reddit/Forum Consensus: