Sodium Bicarbonate

Bicarbonate supplementation · Bicarbonate ingestion

Snapshot

Indications	Contraindications
Exercise performance^{1, 2} Muscular endurance³ Acidosis in chronic kidney disease⁴ Acidosis in critical illness⁵ Acute peripheral vertigo⁶	Pregnancy or nursing⁷ Under age 18⁷

Sodium bicarbonate is an alkalinizing salt that raises blood bicarbonate and pH, acting as an extracellular buffer⁸. That buffering drives its main supplemental use before high-intensity exercise lasting roughly half a minute to twelve minutes. It is also used in chronic kidney disease (CKD) with metabolic acidosis and given intravenously for acidosis in critical illness.

The sports evidence is the most consistent: an umbrella review rated support for peak anaerobic power and muscular endurance as low to moderate quality. In critically ill adults with metabolic acidosis, a recent trial found no benefit on mortality or kidney events, though a meta-analysis found less renal replacement therapy^{5, 9}. In soccer players, a 2025 randomized trial found oral and topical bicarbonate did not speed recovery from muscle damage, but oral use attenuated the later decline in sport-specific performance¹⁰. Many products list sodium bicarbonate, as powders and capsules; enteric-coated capsules produced fewer gastrointestinal symptoms in trained males¹¹, and Form comparison covers the rest.

The main caution is sodium and alkali load: infusion trials reported metabolic alkalosis and hypernatremia^{12, 13}. Some United States product labels say not to use it in pregnancy or nursing⁷.

Last updated October 16, 2026. Read how we make monographs.

In the full monograph

61 sources, 48 studies

When to useThe situations practitioners use it for, each with the reason and the study behind it.
SafetyWho should avoid it, who needs extra care, and the side effects reported in studies.
InteractionsThe medicines and supplements it interacts with, the effect of each, and what labeling says to watch.
Protocol notesThe doses used in studies, how and when they were taken, and how the forms on the market compare.
How it worksWhat it is and how it works in the body, in plain terms.
Published studiesThe studies behind each use, popular claims checked against them, and trials still under way.
Word of mouthWhat patients and practitioners report online, kept separate from the clinical evidence.
Clinical perspectiveA closing read of where the evidence is solid, where it is thin, and what has not been studied.

Snapshot

In the full monograph

Sources