How Baking Soda Water Works

Baking soda water is tap water mixed with sodium bicarbonate—the same compound in baking powder and antacids. When dissolved, it raises the pH of water, making it slightly alkaline instead of neutral. The idea behind drinking it is that this alkalinity might counteract stomach acid or shift your body's acid-base balance, though the evidence for most claims is thin or absent.

Your body tightly controls its own pH through the lungs and kidneys, regardless of what you drink. Water you consume is neutralized almost when ready by stomach acid and digestive enzymes. This means baking soda water cannot meaningfully "alkalize" your blood or tissues—a common claim with no support in human studies. What baking soda can do is temporarily raise the pH inside your stomach, which is why it has been used as an antacid for over a century.

Key Takeaways

  • Baking soda water can neutralize stomach acid temporarily, which is why it may ease heartburn or indigestion in the short term.
  • The claim that baking soda water "alkalizes" your blood or body is not supported by human research—your body maintains its own pH regardless of what you drink.
  • Small amounts of baking soda are generally safe for most people, but regular daily use can raise sodium intake and may interact with certain medications.
  • If you have kidney disease, heart disease, or take medications that affect potassium or sodium, talk to your doctor before drinking baking soda water regularly.

Baking Soda Water and Stomach Acid

The most straightforward use of baking soda water is as a short-term antacid. Sodium bicarbonate reacts with hydrochloric acid in the stomach to produce carbon dioxide, water, and sodium chloride. This reaction neutralizes excess acid and can relieve heartburn or indigestion within minutes. This effect is real and has been documented for decades—it is why baking soda appears in over-the-counter antacid products.

However, this relief is temporary. Once the baking soda is absorbed or passes through your digestive tract, the effect ends. For chronic acid reflux, baking soda water is not a substitute for prescription medications like proton pump inhibitors, which reduce acid production over time. If you use baking soda water regularly for heartburn, you should discuss this with your doctor, especially if symptoms persist.

The "Alkaline Body" Claim and What Research Actually Shows

A widespread claim is that baking soda water makes your body more alkaline, which supposedly prevents disease or improves athletic performance. This claim does not hold up in human research. Your blood pH is maintained between 7.35 and 7.45 by your respiratory and urinary systems—it does not shift based on what you eat or drink. Studies on athletes who consumed sodium bicarbonate before exercise found small improvements in high-intensity endurance performance, but only in very specific conditions (repeated sprints lasting 1 to 7 minutes), and the effect is modest.

The idea that an "acidic body" causes cancer or other disease is not supported by evidence. Cancer cells thrive in both acidic and alkaline environments. No human studies show that drinking alkaline water prevents cancer, improves bone health, or cures any disease. If you are considering baking soda water for a health condition beyond occasional heartburn, the research does not back the claim.

Sodium Content and Who Should Avoid It

One teaspoon of baking soda contains about 1,200 mg of sodium. For context, the American Heart Association recommends no more than 2,300 mg of sodium per day for most adults. A single glass of baking soda water can represent a significant portion of that limit, especially if you drink it daily. Over time, excess sodium intake is linked to high blood pressure and increased cardiovascular risk in people who are salt-sensitive.

If you have kidney disease, heart disease, high blood pressure, or take medications that affect sodium or potassium balance (such as ACE inhibitors or diuretics), regular baking soda water consumption could be harmful. Pregnant women and people with certain metabolic conditions should also check with their doctor first. For most healthy adults, a single dose of baking soda water for heartburn is unlikely to cause problems, but daily use warrants caution.

Baking Soda Water and Exercise Performance

Some athletes drink baking soda water before intense training, based on research showing that sodium bicarbonate can buffer lactic acid buildup in muscles during high-intensity exercise. Studies in trained athletes found that taking sodium bicarbonate 60 to 90 minutes before repeated sprints or high-intensity intervals lasting 1 to 7 minutes improved performance by roughly 2 to 3 percent. This effect is small and only applies to specific types of exercise—not endurance running, cycling, or strength training.

The dose used in these studies is typically 0.3 grams per kilogram of body weight, taken as a capsule or powder mixed with water, not as a casual glass of baking soda water. Side effects include nausea and gastrointestinal discomfort, which can outweigh the modest performance gain. If you are an athlete interested in this approach, work with a sports nutritionist or coach to determine whether it is appropriate for your sport and how to dose it safely.

How to Use Baking Soda Water Safely

If you want to try baking soda water for occasional heartburn, dissolve 1/2 teaspoon of baking soda in 4 to 8 ounces of water and drink it. You should feel relief within a few minutes. Do not exceed 7 teaspoons per day, and do not use it for more than two weeks without talking to your doctor. If you are using it regularly, you may be masking a condition that needs proper diagnosis and treatment.

Always use food-grade baking soda, not the kind sold for cleaning. If you have any chronic health condition, take medications regularly, or are pregnant, ask your doctor before starting baking soda water. Watch for side effects like nausea, vomiting, or unusual thirst, which can signal that the sodium load is too high for your body to handle comfortably.

Baking Soda Water Versus Other Remedies for Heartburn

Baking soda water works quickly but only for a few hours. Antacids like calcium carbonate (Tums) or magnesium hydroxide (Milk of Magnesia) work similarly and may be gentler on sodium intake. H2 blockers like famotidine (Pepcid) reduce acid production and last longer—up to 12 hours. Proton pump inhibitors like omeprazole (Prilosec) are the most powerful and are meant for daily use in people with chronic reflux.

For occasional heartburn triggered by a specific meal, baking soda water or a standard antacid is reasonable. For frequent symptoms, a doctor can help you identify the cause and recommend a more targeted treatment. Lifestyle changes—eating smaller meals, avoiding trigger foods, not eating close to bedtime, and elevating your head while sleeping—often work as well as or better than any remedy.

Frequently Asked Questions

Is baking soda water safe to drink every day?

Daily use is not recommended without medical supervision. The sodium content adds up quickly, and regular consumption can raise blood pressure in salt-sensitive people. If you have heartburn every day, that is a sign to see a doctor rather than self-treat with baking soda water.

Can baking soda water help with kidney stones?

Baking soda may help prevent certain types of kidney stones by raising urine pH, but this is a medical decision, not a home remedy. If you have a history of kidney stones, your doctor may recommend specific dietary changes or medications. Do not self-treat with baking soda water.

Does baking soda water help with bloating or gas?

Baking soda produces carbon dioxide gas in your stomach, which can actually increase bloating in some people. If you have gas or bloating, the cause usually lies in what you ate or how quickly you ate it, not in your body's pH. Baking soda water is unlikely to help and may make it worse.

Can I mix baking soda water with lemon juice?

Yes, lemon juice and baking soda react to produce carbon dioxide, which creates a fizzy drink. However, lemon is acidic, so it neutralizes some of the baking soda's antacid effect. The combination does not offer any advantage over baking soda water alone for heartburn relief.

What is the difference between baking soda and baking powder in water?

Baking powder contains baking soda plus acid and a filler, so it reacts differently when mixed with water. Baking soda alone is the active ingredient used for antacid purposes. Use food-grade baking soda, not baking powder, if you want the antacid effect.