Sodium Bicarbonate
Also known as: NaHCO3, Bicarbonate
Randomized trials and meta-analyses report that acute oral sodium bicarbonate (commonly 0.3 g·kg-1 body mass) raises blood bicarbonate and pH and can improve mean power and time-trial performance in cycling. Effects are heterogeneous across sports: some meta-analyses find performance benefit in cycling time trials, while others report no clear effect for short swim performance or inconsistent findings in combat-sport outcomes. Gastrointestinal symptoms are a commonly monitored side effect; one study using mini-tablets in a carbohydrate hydrogel reported performance benefit with minimal reported GIS.
Last reviewed: 2026-10-14 · 5 indexed studies
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Overview
Sodium bicarbonate is used acutely before high-intensity exercise to increase extracellular buffering capacity. RCTs and meta-analyses report modest performance benefits in cycling time trials and consistent increases in blood bicarbonate, pH and lactate, though effects vary by sport and test.
Mechanism & Function
Mechanism of Action
Provides extracellular bicarbonate that increases blood buffering capacity, delaying exercise-induced acidosis during high-rate glycolytic metabolism and allowing greater high-intensity work before fatigue.
Physiological Role
Buffers hydrogen ions produced by anaerobic glycolysis, raising blood pH and bicarbonate concentration during and before intense exercise.
Primary Pathways
Performance / Health Relevance
Increases extracellular buffering capacity which can delay intramuscular acidosis during high-intensity, glycolytic exercise; this mechanism underpins observed improvements in mean power and some time-trial performances.
Evidence Review
Compare Sodium Forms
Full comparison8 sodium forms are indexed. Bioavailability, clinical evidence, and best-use cases differ meaningfully between them.
| Form | Evidence |
|---|---|
Sodium BicarbonateThis page Oral ingestion reliably raises blood bicarbonate and pH based on RCTs and meta-analyses | 69/100 |
| Calcium Caseinate DIAAS ≈ 1.18; complete EAA profile. | 78/100 |
| Sodium Citrate Rapidly absorbed. Citrate form is better tolerated than sodium bicarbonate with similar buffering effects. | 65/100 |
| Pink Himalayan Salt 100% — fully ionised when dissolved. | 60/100 |
| Boron Not established in the provided abstracts. | 55/100 |
| Sodium Phosphate Not described in the provided abstracts. | 50/100 |
| Sodium Chloride Sodium chloride is well absorbed orally. | 48/100 |
| Hyaluronic Acid Oral bioavailability of intact HA is low; lower-molecular-weight forms are better absorbed. | 35/100 |
Practical Use & Dosage
- Minimum Effective Dose
- 0.3 g·kg-1 body mass (acute), as used in multiple RCTs
- Optimal Range
- 0.3 g·kg-1 body mass prior to exercise (individual time-to-peak strategies have been studied)
- Upper / Caution Level
- Not established in provided abstracts
- Timing
- Acute pre-exercise ingestion with timing individualised to peak alkalosis or as per standard ~60–90 min pre-exercise strategies reported in meta-analyses
- Best Format
- Oral tablets/capsules or mini-tablets; one RCT used mini-tablets delivered in a carbohydrate hydrogel
- Bioavailability
- Oral ingestion reliably raises blood bicarbonate and pH based on RCTs and meta-analyses
- Absorption Considerations
- Individual time-to-peak strategies may improve efficacy compared with fixed timing (reported in meta-analysis)
Safety & Interactions
Side Effects
- •Gastrointestinal symptoms (reported and monitored in trials)
- •Increased blood lactate (observed in meta-analyses)
Monitoring
Monitor for gastrointestinal symptoms when taken acutely before exercise and consider individualising timing to peak bicarbonate to minimise adverse symptoms.
Frequently Asked Questions
Auto-generated from indexed evidence — dosage, safety, interactions, and more.
When is Sodium Bicarbonate typically used or indicated?
Sodium Bicarbonate is most commonly used for: Acute buffering agent for high-intensity exercise, Pre-competition ergogenic aid for time-trials and short-duration maximal efforts. Buffers hydrogen ions produced by anaerobic glycolysis, raising blood pH and bicarbonate concentration during and before intense exercise.
How does Sodium Bicarbonate work?
Provides extracellular bicarbonate that increases blood buffering capacity, delaying exercise-induced acidosis during high-rate glycolytic metabolism and allowing greater high-intensity work before fatigue.
What is the recommended dose of Sodium Bicarbonate?
The optimal range is 0.3 g·kg-1 body mass prior to exercise (individual time-to-peak strategies have been studied). with a minimum effective dose of 0.3 g·kg-1 body mass (acute), as used in multiple RCTs. Best taken: Acute pre-exercise ingestion with timing individualised to peak alkalosis or as per standard ~60–90 min pre-exercise strategies reported in meta-analyses. Upper / caution level: Not established in provided abstracts.
What are the side effects of Sodium Bicarbonate?
Reported side effects include: Gastrointestinal symptoms (reported and monitored in trials); and Increased blood lactate (observed in meta-analyses). Monitoring: Monitor for gastrointestinal symptoms when taken acutely before exercise and consider individualising timing to peak bicarbonate to minimise adverse symptoms.
How strong is the evidence for Sodium Bicarbonate?
Evidence level: Moderate (overall score 69/100), based on 5 indexed studies on SuppIndex.
Research & References (5)
The effect of sodium bicarbonate mini-tablets ingested in a carbohydrate hydrogel system on 40 km cycling time trial performance and metabolism in trained male cyclists.
Randomised, double-blind, crossover RCT in 14 trained male cyclists assessing 0.3 g·kg-1 NaHCO3 delivered as mini-tablets in a carbohydrate hydrogel versus placebo for a 40 km time trial.
Acute effects of sodium bicarbonate ingestion on cycling time-trial performance: A systematic review and meta-analysis of randomized controlled trials.
Systematic review and meta-analysis of randomized placebo-controlled trials assessing acute NaHCO3 ingestion effects on cycling time-trial performance, including analyses of standardized vs individualized ingestion timing.
Can Sodium Bicarbonate Supplementation Improve Combat Sports Performance? A Systematic Review and Meta-analysis.
Systematic review and meta-analysis of NaHCO3 supplementation in combat sports athletes assessing biochemical and physical outcomes.
Effect of sodium bicarbonate contribution on energy metabolism during exercise: a systematic review and meta-analysis.
Systematic review and meta-analysis examining NaHCO3 effects on energy metabolism during exercise, with subgroup analyses for anaerobic vs aerobic outcomes.
Effects of sodium bicarbonate on 200 m time trial performance and physiological responses in swimmers: a systematic review and meta-analysis of randomized controlled trials.
Systematic review and meta-analysis of randomized trials in swimmers assessing effects of NaHCO3 on 200 m time and physiological responses.
Related Ingredients
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Maltodextrin
78/100Short-chain α-1,4 linked glucose polymer that is rapidly hydrolysed by brush-border maltase to glucose; near-equivalent glycaemic response to glucose but lower osmolality at concentration.
Cyclic Dextrin (HBCD)
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Research Overview
Moderate EvidenceCite this ingredient
One-click citation export in APA, MLA, Chicago, BibTeX, or HTML. The URL below is stable and safe to link.
Stable URL
https://thesuppindex.com/ingredients/sodium-bicarbonate
SuppIndex. (2026). Sodium Bicarbonate: Evidence summary, dosage and clinical studies. Retrieved October 16, 2026, from https://thesuppindex.com/ingredients/sodium-bicarbonate
Based on 5 indexed studies · Evidence level: Moderate.
Goal Ratings
Stack Compatibility
Has been administered with a carbohydrate hydrogel delivery system in at least one RCT; timing individualisation (time-to-peak) has been evaluated and may influence effect size.