Baking soda has legitimate health uses, but it comes with real risks that make “good for you” a complicated answer. A single teaspoon contains nearly 1,260 mg of sodium, which is more than half the daily limit most health guidelines recommend. That high sodium content is the central trade-off: baking soda can neutralize stomach acid, improve exercise performance, and even help manage certain chronic conditions, but overuse can raise blood pressure, disrupt your body’s chemistry, and in rare cases cause serious harm.
Occasional Heartburn Relief
Baking soda’s oldest home remedy use is as an antacid. It works by directly neutralizing excess stomach acid on contact, which is why relief feels almost immediate. The standard dose is half a teaspoon dissolved in a full glass of cold water, taken no more than every two hours. The daily ceiling is five teaspoons, though most people need far less for occasional heartburn.
This is a short-term fix, not a daily habit. Each half-teaspoon dose delivers roughly 630 mg of sodium, so even moderate use adds up fast. If you’re reaching for baking soda more than a couple of times a week, an over-the-counter antacid with less sodium or a conversation with your doctor about the underlying cause is a better path.
Exercise Performance Benefits
Athletes have used baking soda as a legal performance aid for decades, and the science backs it up for specific situations. During intense exercise, your muscles produce acid that contributes to the burning, heavy feeling that forces you to slow down. Baking soda buffers that acid in the bloodstream, letting you push harder for longer.
The effective dose is about 0.3 grams per kilogram of body weight, taken one to three hours before exercise. For a 150-pound person, that works out to roughly 20 grams, or about four teaspoons. Research shows measurable benefits across cycling, running, rowing, boxing, tennis, and other high-intensity sports. The gains are modest but real, particularly in efforts lasting one to seven minutes where acid buildup is the main performance limiter.
There’s a catch: that dose often causes stomach cramps, nausea, or diarrhea. Some athletes spread smaller doses across meals over three to seven days before competition instead, which reduces gut issues while still loading the buffering capacity. Even so, the gastrointestinal side effects are common enough that many people can’t tolerate it.
Kidney Disease and Metabolic Acidosis
One of baking soda’s most meaningful medical applications is in chronic kidney disease. When kidneys lose function, they struggle to remove acid from the blood, creating a condition called metabolic acidosis. This accelerates further kidney damage, breaks down muscle, and increases hospitalizations.
A 2024 meta-analysis of 14 clinical trials covering over 2,000 patients found that sodium bicarbonate supplementation significantly slowed kidney function decline compared to no treatment. Patients taking it also had 63% lower odds of hospitalization and preserved more muscle mass. However, the treatment came with a measurable increase in systolic blood pressure, and it did not reduce overall mortality. This is a supervised medical treatment, not a DIY supplement. The doses, monitoring, and trade-offs require a nephrologist’s guidance.
Skin Uses
Baking soda baths have shown some promise for certain skin conditions. In a study of 31 people with mild to moderate psoriasis, bathing in water with dissolved baking soda on alternating days for three weeks reduced symptom severity by an average of 39%, with some participants seeing reductions above 60%. Patients also reported less itching and irritation compared to a control group. For people with a condition called aquagenic pruritus, where water itself triggers intense itching, adding baking soda to bathwater provided relief in case reports.
Baking soda paste applied to bug bites or minor skin irritation works on a simple principle: its alkaline pH counteracts the acidic compounds that cause inflammation. One clinical study found that a 5% baking soda solution used as a skin prep was better tolerated than alcohol alone, with 74% of patients reporting lower pain and higher satisfaction. That said, prolonged or heavy application directly to skin, especially broken or irritated skin, can cause harm. One case report documented an infant who developed a serious metabolic imbalance from excessive baking soda applied to a diaper rash.
The Sodium Problem
The single biggest concern with regular baking soda use is sodium. At 1,259 mg per teaspoon, even a modest antacid dose puts a significant dent in the 2,300 mg daily limit recommended for most adults. For people with high blood pressure, heart failure, or kidney disease, this sodium load can worsen fluid retention, raise blood pressure, and strain the cardiovascular system. The kidney disease research confirmed this directly: patients on sodium bicarbonate had higher systolic blood pressure than those without it.
If you already eat a typical Western diet, you’re likely consuming 3,400 mg of sodium per day before adding baking soda to the mix. That context matters when evaluating whether occasional use is reasonable for you.
Serious Risks of Overuse
Taking too much baking soda can cause a condition called metabolic alkalosis, where the blood becomes too alkaline. Mild cases cause tingling, numbness, nausea, and muscle cramps. Severe cases can lead to confusion, agitation, and seizures. People with kidney failure are especially vulnerable because their kidneys can’t correct the imbalance.
There’s also a more immediate danger. When baking soda hits stomach acid, it rapidly produces a large volume of carbon dioxide gas. After a big meal or heavy drinking, when the stomach is already full and stretched, this sudden gas production can create dangerous pressure. Stomach ruptures from baking soda use have been documented, almost always in situations involving a large meal or alcohol binge. The Poison Control center specifically warns against using baking soda as a home remedy after overeating or drinking.
Children are at higher risk for toxicity because even small amounts represent a larger dose relative to their body weight. Baking soda should be kept out of reach like any other household chemical, and it should not be used as an antacid for young children.
Who Should Avoid It
Baking soda is not appropriate for everyone, even in small amounts. You should avoid it if you have high blood pressure, heart failure, or any condition requiring a low-sodium diet. People with kidney disease should only use it under medical supervision. Pregnant women, children under 12, and anyone already taking prescription antacids or acid-reducing medications should skip the home remedy approach entirely.
For occasional heartburn in an otherwise healthy adult, a half-teaspoon in water is generally safe. For anything beyond that, whether it’s athletic performance, skin conditions, or managing a chronic disease, the doses involved are high enough that the risks deserve careful consideration.