Sodium Bicarbonate

What it does

Sodium bicarbonate is baking soda: an alkaline buffer. Swallowed, it raises blood bicarbonate, which lets muscles clear acid faster during hard efforts. It is also an antacid and a prescribed treatment for metabolic acidosis in kidney disease. In natural-health teaching, including Barbara O'Neill's, it is promoted as a general alkalizer for the body.

What the research says

• Improves high-intensity exercise performance lasting about 1 to 12 minutes, by a small amount

  Evidence: moderate. The International Society of Sports Nutrition's position stand concludes bicarbonate improves muscular endurance and high-intensity performance in men and women at 0.3 g/kg taken 60 to 180 minutes beforehand. The Carr 2011 meta-analysis put the effect at roughly 1.7 percent on mean power in short efforts. This is one of the better-supported acute ergogenic aids in the literature, and also one of the narrowest: it does nothing for long steady endurance or single maximal lifts.

• The gastrointestinal tax is part of the effect size

  Evidence: moderate. A 2025 meta-analysis of running studies found gastrointestinal symptoms in about 29.5 percent of bicarbonate trials versus 2.6 percent on placebo, with withdrawals to match. Bloating, urgency, and diarrhea mid-event erase the 1.7 percent for many users; split dosing, capsules, and rehearsing in training are mitigations, not eliminations.

• Treating metabolic acidosis in kidney disease is a real medical use, in medical hands

  Evidence: moderate. In chronic kidney disease with low serum bicarbonate, prescribed bicarbonate slowed progression in randomized trials (de Brito-Ashurst 2009), and kidney guidelines endorse treatment. That is a monitored indication with blood tests, not a wellness practice; the same sodium load that is trivial for an athlete matters in kidney and heart patients.

• The 'alkalize the body' doctrine taught around this ingredient is not how pH works

  Evidence: weak. Bicarbonate does raise blood bicarbonate briefly (that is the sports mechanism, and the body corrects it). But blood pH is held between 7.35 and 7.45 by lungs and kidneys regardless of diet in healthy people; what changes measurably is urine pH, which is the kidneys doing their job. Claims that dietary alkalizing prevents or treats cancer or systemic disease have no trial basis. Graded under the gap rule because this doctrine is the main reason the ingredient is searched.

Baking soda has the odd distinction of being a genuinely effective sports supplement that most of its buyers are not using for sport. Its ergogenic effect is position-stand grade: real, replicated, and small, with a gastrointestinal tax that consumes it for a third of users. Its kidney indication is legitimate and medical. The empire built on top of it (alkalizing the body against disease) contradicts basic physiology. C+ averages a B-grade niche use, an honest side-effect profile, and an F-grade doctrine, weighted by how the ingredient is actually bought and taught.

Is it worth it?

Evidence (C+) sits below the leaderboard floor, so the worth-it grade is capped at C+ however inexpensive it is; the raw derivation on its near-zero cost would otherwise run far higher, which is what the cap exists to prevent. About $3 a month at any sane usage. Derived from the October 2026 worth-it model.