What baking soda actually does when you drink it
Baking soda is sodium bicarbonate, a base that neutralizes acid. When you drink it dissolved in water, it raises the pH level in your stomach and bloodstream temporarily. This is why people reach for it: the when ready effect is real—it can calm heartburn or indigestion within minutes by counteracting stomach acid. The effect is short-lived, usually lasting 30 minutes to a few hours depending on how much you drink and what you eat afterward.
Beyond heartburn relief, people drink baking soda for other reasons—some backed by research, others more speculative. Athletes sometimes use it before intense exercise, thinking it buffers lactic acid buildup. People with certain kidney conditions take it under medical supervision to manage blood acidity. The science varies widely depending on what you're hoping it will do.
Key Takeaways
- Baking soda neutralizes stomach acid quickly, which is why it works for heartburn, but the effect lasts only 30 minutes to a few hours.
- Drinking too much baking soda can cause nausea, vomiting, and electrolyte imbalances, especially if you use it regularly.
- People with heart disease, high blood pressure, or kidney problems should not drink baking soda without talking to their doctor first.
- For heartburn, over-the-counter antacids designed for that purpose are usually safer and more predictable than homemade baking soda solutions.
- Baking soda is not a treatment for serious conditions—if heartburn happens often or you have other symptoms, see a doctor to find the actual cause.
How baking soda affects your stomach and acid levels
Your stomach produces hydrochloric acid to break down food. When acid backs up into your esophagus, you feel heartburn. Baking soda works by creating a chemical reaction: the base meets the acid and they neutralize each other, producing carbon dioxide (which is why you may burp), water, and sodium chloride. The result is when ready relief from the burning sensation.
The catch is that your stomach needs acid to digest food properly. Neutralizing it temporarily doesn't harm digestion in one dose, but regular use can interfere with how your body absorbs certain nutrients and minerals. Your stomach also responds to repeated baking soda use by producing more acid to compensate, which can lead to a rebound effect—heartburn returns worse than before once the baking soda wears off.
Side effects and risks of drinking baking soda
A single dose of baking soda in water is usually safe for most people. Common mild side effects include bloating, gas, and nausea from the carbon dioxide produced during the reaction. Some people feel full quickly or experience mild constipation.
Regular or large doses carry real risks. Drinking too much baking soda can cause metabolic alkalosis, a condition where your blood becomes too alkaline. Symptoms include nausea, vomiting, muscle weakness, confusion, and in severe cases, seizures. It can also disrupt your electrolyte balance, lowering potassium and calcium levels, which affects heart rhythm and bone health. People who are pregnant, have kidney disease, heart disease, high blood pressure, or take certain medications should not drink baking soda without medical guidance.
Who should avoid baking soda entirely
If you have kidney disease, your kidneys may not regulate sodium and acid-base balance properly, making baking soda dangerous. People with heart failure or high blood pressure need to limit sodium intake, and baking soda adds sodium to your diet. Those taking diuretics, certain antibiotics, or corticosteroids may have dangerous interactions.
Pregnant and breastfeeding people should check with their doctor before using baking soda regularly. Children should not drink baking soda solutions without medical supervision. If you have a history of acid reflux that happens more than twice a week, the underlying cause needs investigation—baking soda masks the symptom but does not address why your stomach is producing excess acid or why your esophageal sphincter is not closing properly.
Baking soda versus other heartburn treatments
Over-the-counter antacids like calcium carbonate (Tums) and magnesium hydroxide (Milk of Magnesia) work similarly to baking soda but are formulated to be safer for regular use. They neutralize acid without the sodium load or the rebound effect that baking soda can cause. H2 blockers like famotidine (Pepcid) reduce acid production rather than neutralizing existing acid, so they prevent heartburn before it starts and last longer—up to 12 hours.
Proton pump inhibitors (omeprazole, lansoprazole) are stronger still, blocking the mechanism that produces stomach acid. They require a prescription for regular use but are the standard treatment for frequent heartburn. If you find yourself reaching for baking soda more than once a week, one of these options is likely more appropriate and safer long-term. A doctor can help you choose based on how often you have heartburn and what else is going on with your health.
The research on baking soda for athletic performance
Some athletes drink baking soda before high-intensity exercise, based on the idea that it buffers lactic acid that builds up in muscles during intense effort. Research shows the effect is real but small—studies find modest improvements in performance during repeated sprints or high-intensity intervals lasting 1 to 10 minutes. The benefit is measurable but not dramatic, and it comes with the same side effects: nausea, bloating, and gastrointestinal discomfort that can actually hurt performance.
Athletes who do use baking soda typically take a precise dose (around 0.3 grams per kilogram of body weight) mixed with a large amount of water, timed 60 to 90 minutes before exercise. This is very different from casually drinking baking soda for heartburn. If you are considering this for sports, talk to a sports medicine doctor or registered dietitian first—they can tell you whether it makes sense for your specific sport and how to do it safely.
What to do if heartburn is a regular problem
Occasional heartburn is normal and baking soda is a reasonable one-time fix. But if you have heartburn more than twice a week, something else is going on. Common causes include eating large meals, eating close to bedtime, certain foods (spicy, fatty, acidic, or caffeinated), stress, excess weight, or a condition called gastroesophageal reflux disease (GERD) where the valve between your stomach and esophagus does not close properly.
A doctor can diagnose the cause and recommend treatment that actually addresses the problem rather than just masking the symptom. In the meantime, straightforward changes often help: eating smaller meals, waiting three hours after eating before lying down, raising the head of your bed, avoiding trigger foods, and managing stress. These changes cost nothing and have no side effects, making them a good first step before reaching for any treatment.
Frequently Asked Questions
How much baking soda should I drink for heartburn?
A typical dose is half a teaspoon dissolved in a glass of water, taken once. Do not exceed one teaspoon in 24 hours. If you need more than this occasionally, switch to an over-the-counter antacid or see a doctor. Baking soda is not meant for regular daily use.
Can I drink baking soda every day?
No. Daily use increases the risk of metabolic alkalosis, electrolyte imbalances, and rebound acid production. If you have heartburn every day, the cause needs medical attention. A doctor can prescribe something safer for long-term use or help you address what is causing the heartburn.
Is baking soda better than antacids from the store?
Not really. Store-bought antacids are formulated to be safer and more predictable than homemade baking soda solutions. They do not carry the same sodium load or rebound risk. For occasional heartburn, either works; for frequent heartburn, a pharmacy antacid or prescription medication is the better choice.
What happens if I drink baking soda on an empty stomach?
Baking soda on an empty stomach can cause nausea and bloating more easily than when taken with food. It also works faster but wears off faster. If you use it, take it with a small amount of food or water to reduce stomach upset.
Can baking soda hurt my teeth?
Baking soda is mildly abrasive and slightly alkaline. Drinking it regularly will not damage teeth, but swishing it around your mouth or using it as a rinse can wear down enamel over time. Stick to swallowing it in water rather than using it as a mouth rinse.