What Does Baking Soda Do?

Baking soda is sodium bicarbonate, a simple white powder that acts as a leavening agent, a mild alkali, and a gentle abrasive. In cooking, it reacts with acid to produce carbon dioxide gas, which makes dough rise. Outside the kitchen, it neutralizes odors, lifts stains, and can alter the pH balance of water or your body when used properly. These are the facts — but much of what you see online about baking soda is either overblown or flat-out wrong.

How Does Baking Soda Work in Cooking and Baking?

Baking soda needs an acid and moisture to start working. When you mix it with something like buttermilk, vinegar, lemon juice, or yogurt, a chemical reaction happens. This reaction releases carbon dioxide gas in the form of tiny bubbles. Those bubbles get trapped in the dough or batter, causing it to expand and become light and fluffy.

This is why recipes often call for baking soda along with an acidic ingredient. If you use baking soda without enough acid, your baked goods can turn out dense and develop a soapy, metallic taste. That flavor is a sign that unreacted baking soda is still in the food. Research shows that getting the ratio right matters — too much baking soda not only ruins the taste but can also break down the structure of the batter.

A common confusion is between baking soda and baking powder. Baking powder already contains an acid mixed in (usually cream of tartar), so it only needs liquid to activate. Baking soda is about four times stronger than baking powder. You cannot swap them one-for-one without adjusting the other ingredients. If a recipe calls for one teaspoon of baking soda, you would need about four teaspoons of baking powder to get a similar rise.

Can Baking Soda Really Whiten Your Teeth?

Yes, but with limits. Studies have found that toothpaste containing baking soda removes surface stains more effectively than toothpaste without it. The reason is simple: baking soda is a mild abrasive. It physically scrubs away plaque and discoloration from coffee, tea, and tobacco. It also raises the pH in your mouth, which may reduce the growth of bacteria that cause bad breath.

However, there is a difference between commercial baking soda toothpaste and dipping your toothbrush into a box of Arm & Hammer. Commercial products are formulated with the right particle size and concentration. Straight baking soda is more abrasive, and if you scrub too hard or too often, you can wear down your enamel. Enamel does not grow back.

Some people report that brushing with baking soda makes their teeth feel cleaner and look brighter after a few weeks. That is plausible. But current research suggests that long-term use of straight baking soda for brushing has not been well studied for safety. If you want to try it, limit it to once or twice per week. Use a soft toothbrush. Do not scrub aggressively. If your teeth are sensitive or you have receding gums, skip this method entirely.

Does Baking Soda Help with Heartburn or Indigestion?

Baking soda can neutralize stomach acid quickly. That is why some people mix half a teaspoon of baking soda into a glass of water and drink it for heartburn relief. The science is straightforward: sodium bicarbonate is a base, and stomach acid is hydrochloric acid. When they combine, they neutralize each other, which can reduce the burning sensation.

But this is not a long-term solution. The problem is that drinking baking soda water introduces a lot of sodium into your system. One half-teaspoon contains about 630 milligrams of sodium — roughly a quarter of the daily recommended limit for most adults. If you have high blood pressure, kidney disease, or are on a low-sodium diet, this can be dangerous.

There is also the issue of acid rebound. Some evidence indicates that after the initial neutralization, your stomach may produce even more acid to compensate. This can make heartburn worse over time. As of 2026, medical guidelines still recommend antacids like Tums or calcium carbonate as safer options for occasional heartburn. Baking soda is a kitchen ingredient, not a medicine. If you have chronic heartburn, see a doctor instead of reaching for the box.

What Does Research on Baking Soda for Exercise Performance Show?

Some athletes use baking soda to delay muscle fatigue during high-intensity exercise. The theory is that sodium bicarbonate acts as a buffer. When you exercise hard, your muscles produce lactic acid, which makes them burn and tire. By raising the pH of your blood, baking soda may help clear that acid faster, allowing you to push a little longer.

Studies have found that taking baking soda about 60 to 90 minutes before exercise can improve performance in events lasting one to seven minutes. This includes activities like sprinting, rowing, or repeated high-intensity intervals. The effect is real but modest — typically a 1 to 3 percent improvement. For an elite athlete, that can matter. For a weekend jogger, it probably will not make a noticeable difference.

There is a major downside: gastrointestinal distress. Many people who take baking soda before exercise experience bloating, cramping, nausea, and diarrhea. The dose needed for performance is about 0.3 grams per kilogram of body weight. For a 150-pound person, that is roughly 20 grams — about four teaspoons. That is a lot of baking soda in a short time, and your gut will let you know.

Current research suggests that if you want to try this, you should test it during a low-stakes training session first. Do not try it on race day without knowing how your body reacts. And do not do it regularly — the long-term effects of chronic high-dose baking soda intake are not well understood.

Is Baking Soda Effective for Cleaning Around the House?

Baking soda is a useful cleaning agent for specific jobs. Its mild abrasiveness makes it good for scrubbing surfaces without scratching them. It also absorbs odors rather than just covering them up. That is why an open box in the fridge can help reduce smells — the baking soda traps odor molecules in its crystal structure.

Here are some cleaning uses that actually work based on how baking soda behaves:

• Scrubbing sinks, tubs, and countertops — mix with a little water to form a paste.
• Deodorizing carpets — sprinkle on, let sit for 15 minutes, then vacuum.
• Removing baked-on food from pans — boil water with baking soda in the pan, then scrub.
• Freshening laundry — add half a cup to the wash cycle to help neutralize odors.

But baking soda is not a disinfectant. It does not kill bacteria or viruses. If you need to sanitize a surface, you still need a proper disinfectant like diluted bleach or hydrogen peroxide. Baking soda can clean grime, but it does not make things germ-free. Also, mixing baking soda with vinegar creates a fizzy reaction that looks impressive but is mostly water and sodium acetate. That reaction does not clean better than either ingredient alone. You are better off using them separately.

What Are the Risks and Side Effects of Using Baking Soda?

Baking soda is safe in the amounts typically used in cooking. Problems arise when people consume large quantities or use it in ways it was not intended. The most common risk is sodium overload. As mentioned, half a teaspoon contains over 600 milligrams of sodium. If you drink baking soda water daily, you can push your blood pressure into unhealthy territory quickly.

There is also a risk of metabolic alkalosis. This happens when your blood becomes too alkaline. Symptoms include confusion, muscle twitching, nausea, and in severe cases, seizures. This is rare but has been documented in people who consumed baking soda regularly for heartburn or athletic performance. People with kidney disease are especially vulnerable because their kidneys cannot remove excess bicarbonate effectively.

Baking soda can also interact with medications. It may reduce the absorption of certain drugs, including some antibiotics and blood pressure medications. If you take prescription medication, check with a pharmacist before using baking soda as a remedy. As of 2026, poison control centers still receive calls every year about children or adults who ingested too much baking soda thinking it was harmless. It is not poison, but it is not water either.

What Should You Avoid When Using Baking Soda?

Do not use baking soda as a substitute for medical treatment. If you have chronic heartburn, acid reflux, or stomach pain, see a doctor. Baking soda can mask symptoms without addressing the underlying cause. It can also interfere with diagnostic tests for conditions like ulcers or gastritis.

Do not ingest baking soda for weight loss or as a detox. This is a viral myth with no scientific support. Drinking baking soda water does not burn fat, flush toxins, or reset your metabolism. The only thing it reliably does is increase your sodium intake. Some people report feeling less bloated temporarily because the baking soda neutralizes stomach acid, but that is not weight loss.

Do not apply baking soda to your skin as a treatment for acne, eczema, or rashes. Baking soda has a pH around 8 to 9, while healthy skin is naturally acidic at about pH 4.5 to 5.5. Putting an alkaline substance on your skin can disrupt its protective barrier, leading to dryness, irritation, and even more breakouts. Dermatologists generally advise against it. If you want a gentle exfoliant, look for products specifically designed for facial skin.

Do not store baking soda indefinitely and expect it to work. An open box absorbs moisture and odors over time. For baking, it loses potency after about six months. You can test it by dropping a spoonful into vinegar — if it fizzes vigorously, it is still active. If not, replace it. For cleaning and deodorizing, older baking soda still works but less effectively.