People drink baking soda for several legitimate reasons: to neutralize stomach acid and relieve heartburn, to boost athletic performance, and in some cases, as part of medical treatment for kidney disease. A half teaspoon dissolved in water is the most common home dose, but even that small amount contains nearly 630 mg of sodium, so the practice carries real risks if overdone or used carelessly.
Heartburn and Acid Relief
The most common reason people reach for baking soda is heartburn. Sodium bicarbonate is a base that reacts directly with hydrochloric acid in the stomach. The chemical reaction converts excess acid into water and carbon dioxide, which you exhale or burp out. Relief tends to come within minutes, which is why baking soda has been a go-to home remedy for generations. It’s also the active ingredient in several over-the-counter antacid products.
The tradeoff is that the relief is short-lived. Baking soda doesn’t prevent your stomach from producing more acid, so the discomfort often returns. The carbon dioxide generated by the reaction also causes bloating and gas. On a full stomach, this gas production can be genuinely dangerous. Case reports have documented stomach rupture in people who took sodium bicarbonate after binge eating, because the sudden gas expansion combined with an already overstretched stomach wall. This is rare, but it’s why you should never take baking soda on an extremely full stomach.
Athletic Performance
This is one of the better-studied uses. During intense exercise, your muscles produce acid as a byproduct of burning fuel quickly. That rising acidity contributes to the burning sensation and fatigue that force you to slow down. Drinking sodium bicarbonate beforehand raises the buffering capacity of your blood, helping your body clear that acid more efficiently and letting you push harder for longer.
The International Society of Sports Nutrition recognizes sodium bicarbonate as an effective performance supplement. The optimal dose is about 0.3 grams per kilogram of body weight, taken 60 to 180 minutes before exercise. For a 150-pound person, that works out to roughly 20 grams, far more than a casual kitchen dose. Benefits show up most clearly in high-intensity efforts lasting 1 to 7 minutes: cycling sprints, rowing intervals, swimming races, and combat sports like boxing and judo. A minimum dose of 0.2 g/kg appears necessary to see any effect at all.
The catch is gastrointestinal distress. Higher doses (0.4 to 0.5 g/kg) don’t improve performance beyond the 0.3 g/kg level but do increase nausea, bloating, and diarrhea. Many athletes split the dose across multiple smaller servings or take it with a carbohydrate-rich meal to reduce stomach problems.
Kidney Disease and Metabolic Acidosis
When kidneys lose function, they become less efficient at removing acid from the blood. This leads to a condition called metabolic acidosis, where blood bicarbonate levels drop below the normal range of 22 to 29 mEq/L. Clinical guidelines recommend supplementing with a base like sodium bicarbonate when levels fall below 22 mEq/L, and this is a standard part of managing chronic kidney disease under medical supervision.
A meta-analysis of clinical trials found that oral sodium bicarbonate slowed the decline in kidney filtration rate by a meaningful margin compared to no treatment. It also raised blood bicarbonate levels by an average of 2.37 mEq/L, reduced a key marker of kidney damage (urinary albumin-to-creatinine ratio), and modestly lowered blood pressure. These are significant findings for a condition where preserving remaining kidney function is the central goal. This is not a home remedy situation, though. Dosing depends on lab work and has to be balanced against the sodium load, which can worsen fluid retention and high blood pressure in some patients.
Uric Acid and Kidney Stones
Baking soda makes urine less acidic, which can help dissolve uric acid crystals before they become a problem. In a study of adults with type 1 diabetes, two doses of about 2 grams of sodium bicarbonate over 24 hours raised average urine pH from 6.1 to 6.5. Before treatment, 31% of participants had uric acid crystals in their urine. Afterward, only 6.7% did. This matters because uric acid crystals can damage the tiny tubes inside the kidneys and contribute to kidney stone formation.
Some people with gout or a history of uric acid kidney stones use baking soda for this purpose, though prescription options exist that do the same thing with more predictable dosing.
Oral Health
Rinsing with a baking soda solution (not necessarily swallowing it) raises the pH inside your mouth. Tooth enamel begins to dissolve at a pH below about 5.5, and after eating, mouth pH can drop into that danger zone. A sodium bicarbonate rinse pushes pH back above this critical threshold, which helps protect enamel and creates conditions that favor remineralization. This is why baking soda appears in many toothpaste formulations.
The Sodium Problem
One teaspoon of baking soda contains about 1,260 mg of sodium, which is over half the American Heart Association’s recommended daily limit of 2,300 mg. Even a half teaspoon adds roughly 630 mg. For someone already eating a typical diet, that single dose could push total daily sodium intake well past healthy limits. Over time, excess sodium raises blood pressure and increases the risk of heart disease and stroke.
This sodium load is the single biggest reason baking soda shouldn’t be used as a daily remedy for heartburn or indigestion. People with high blood pressure, heart failure, or kidney disease are especially vulnerable. If you’re reaching for baking soda more than occasionally, that’s a signal to address the underlying problem rather than keep neutralizing symptoms.
Risks of Taking Too Much
Overdoing baking soda pushes your blood pH too high, a condition called metabolic alkalosis. Early symptoms include nausea, vomiting, diarrhea, irritability, and muscle spasms. If those symptoms lead to significant fluid loss, electrolyte imbalances can follow, potentially causing heart rhythm disturbances. Muscle weakness and convulsions are possible in severe cases.
Baking soda also interferes with how your body absorbs certain medications. By raising stomach pH, it reduces the absorption of some antibiotics in the tetracycline family as well as certain antiviral and antifungal drugs. If you take any prescription medication, separating doses by at least two hours is the minimum precaution, but some drug interactions are serious enough that combining them with baking soda should be avoided entirely.
How to Use It Safely
For occasional heartburn, a half teaspoon dissolved in 4 ounces of water is a reasonable single dose. Don’t take it on a very full stomach. Don’t use it daily for more than two weeks without medical guidance. And don’t treat it as a substitute for understanding why you’re having symptoms in the first place.
For athletic performance, the effective dose is much higher and should be timed carefully before competition, ideally with food and plenty of water to minimize GI side effects. For kidney disease or chronic metabolic acidosis, sodium bicarbonate is a legitimate medical tool, but one that requires blood work and professional oversight to dose correctly.