Other Ingredients

Sodium Bicarbonate

Also known as: Baking soda, Bicarbonate of soda, NaHCO3

The kitchen chemical with a sports-science career — buffering acid is real performance ergogenics, antacid use included.

By IngredientWiki Editorial Team
Fact-checked by IngredientWiki Editorial Team
Updated 2026-09-26
2 min read

In short

Sodium bicarbonate — baking soda — is one of the most studied ergogenic aids in sports science, and its mechanism is elementary chemistry: it raises blood bicarbonate, buffering the acid that accumulates in muscles during intense exercise. Meta-analyses confirm meaningful performance improvements in high-intensity efforts lasting roughly 1–10 minutes, with the caveat that the effective dose (~0.3 g per kg of body weight) causes stomach upset in a significant minority of users. Outside sport, it is a fast-acting antacid and a household staple — cheap, effective, and dose-sensitive in every role.

Buffers muscle acidosis — the baking soda 'pre-load'
Meta-analyses: real gains in 1–10 minute high-intensity efforts
Effective dose ~0.3 g/kg — often causes GI distress
Also a fast-acting antacid (OTC)

What is Sodium Bicarbonate?

Baking soda's second career as a performance supplement is a favorite story in exercise physiology: a kitchen chemical, dosed by body weight, measurably improving sprint and interval performance through nothing fancier than acid-base chemistry. During intense efforts, muscle acidity is a major fatigue signal; pre-loading bicarbonate arms the blood's buffering capacity against it. The literature is unusually consistent — meta-analyses across decades agree the effect is real and the practical problem is not efficacy but tolerability. It remains the rare supplement with a mechanism you could explain in a high-school chemistry class.

Where it comes from

Natural sources

Bicarbonate is a natural component of the body's pH buffer system
Baking soda itself is a manufactured mineral salt (sodium hydrogen carbonate)

How it's made

Manufactured NaHCO3; sold as food-grade powder, capsules, and in effervescent tablets.

What it does in products

Benefits

High-intensity performance

strong evidence

Meta-analyses find ~2–3% performance improvements in efforts lasting 1–10 minutes — sprint cycling, rowing, combat sports — among the most replicated effects in sports supplements.

Repeated-sprint and team-sport performance

moderate evidence

Studies show better maintenance of repeated high-intensity efforts, relevant to team sports and interval training.

Indigestion and heartburn

strong evidence

A fast, effective OTC antacid for occasional symptoms; not for chronic use without medical advice.

Side effects & safety

Stomach upset, bloating, and nausea (common)The main practical obstacle at ergogenic doses; strategies include splitting doses, capsules, and timing.

Diarrhea (uncommon)Dose-related; reduce the dose.

Safety considerations

Occasional antacid use is generally acceptable; performance dosing is not recommended in pregnancy (sodium load).
Raises sodium intake — caution with hypertension, heart failure, or kidney disease.
Can alter absorption and excretion of some medications (lithium, aspirin, others) — separate by hours.
Not for: Heart failure or significant hypertension (sodium load)
Not for: Kidney disease
Not for: Metabolic alkalosis risk

How it's used

In supplements

Performance dose: 0.3 g per kg of body weight (≈20–25 g for an 80 kg athlete) 60–120 minutes before high-intensity events. Start with 0.2 g/kg in training to test tolerance; splitting into smaller doses over 2–3 hours reduces GI distress. Antacid use: follow OTC label.

Regulatory status

GRAS food substance and OTC antacid; supplement use is governed by DSHEA.
GRAS (generally recognized as safe) for food use.

The GI problem, and the practical workarounds

The dose that works is also the dose that upsets stomachs: 0.3 g/kg puts 20+ grams of an alkaline salt into the gut, and trials routinely report nausea and bloating as the reason athletes abandon it. The workaround toolkit is well established in the sports-science literature: split the dose across 2–3 hours pre-event, use capsules to slow release, consume with a small carbohydrate meal, and — most important — trial it in training, never debut it in competition. Individual tolerance varies enormously; the athletes who benefit most are those who found a delivery scheme their stomach accepts.

Frequently asked questions

How does baking soda improve performance?

It buffers the hydrogen ions that build up during intense exercise, delaying the acidosis that contributes to fatigue. The benefit shows up in high-intensity efforts of roughly 1–10 minutes.

How much baking soda should I take before exercise?

The research dose is 0.3 g per kg of body weight, 60–120 minutes pre-exercise. Start lower (0.2 g/kg) and test in training — the main side effect is stomach distress.

Is sodium bicarbonate safe as an antacid?

For occasional heartburn, yes — but it delivers a meaningful sodium load, so people with high blood pressure, heart failure, or kidney disease should choose alternatives, and anyone with persistent symptoms needs medical evaluation.

The bottom line

Sodium bicarbonate is one of the most honestly evidence-backed performance supplements — real gains in high-intensity efforts, delivered through elementary buffering chemistry. The deal is tolerability: test small, split doses, and respect the sodium load.

References

Sodium bicarbonate and performance (meta-analysis). PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=sodium+bicarbonate+performance+meta-analysis
Bicarbonate buffering and fatigue — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=bicarbonate+buffering+exercise+acidosis
Sodium bicarbonate and GI distress — literature search. PubMed (National Library of Medicine). https://pubmed.ncbi.nlm.nih.gov/?term=sodium+bicarbonate+gastrointestinal+exercise
Sodium bicarbonate compound summary. PubChem (National Library of Medicine). https://pubchem.ncbi.nlm.nih.gov/compound/516892