When you mix baking soda and apple cider vinegar, the two ingredients react to produce sodium acetate, water, and carbon dioxide gas (the fizzing you see). That reaction is straightforward chemistry, but the health claims surrounding this combination are more complicated. Each ingredient has some legitimate uses on its own, though mixing them together often cancels out the very properties that make them useful.
What Happens When You Mix Them
Baking soda is a base. Apple cider vinegar is an acid. When they meet, the acid breaks apart the baking soda and the atoms rearrange into three new substances: sodium acetate (the compound behind the tangy flavor in salt-and-vinegar chips), water, and carbon dioxide. The carbon dioxide is the gas that creates all the bubbling.
Here’s the important part: once the fizzing stops, you’re left with slightly salty water. The acid in the vinegar and the alkalinity of the baking soda have neutralized each other. That means most of the individual benefits people attribute to each ingredient no longer apply to the mixture. Drinking the leftover liquid is essentially drinking diluted sodium acetate, which doesn’t carry the same effects as either ingredient alone.
Apple Cider Vinegar and Blood Sugar
Apple cider vinegar does have real evidence behind one specific claim: it can lower blood sugar after meals. The acetic acid in vinegar slows down how quickly your stomach empties food into your intestines, which spreads out the sugar absorption over a longer window. It also appears to block certain enzymes that break down starches and may reduce the liver’s output of glucose between meals.
These aren’t dramatic effects, but they’re measurable. The catch is that the acetic acid is what drives them. If you neutralize that acid by adding baking soda, you lose the mechanism entirely.
Apple Cider Vinegar and Weight Loss
A meta-analysis of randomized controlled trials in people with type 2 diabetes or excess weight found that daily apple cider vinegar intake led to meaningful changes in body composition over about 12 weeks. Participants lost an average of roughly 7.4 kg (about 16 pounds), reduced their BMI by about 2 points, and trimmed nearly 3 cm from their waist circumference compared to control groups. The most effective dose in these studies was about 2 tablespoons (30 mL) per day.
Those numbers sound impressive, but context matters. The participants in these trials were mostly people who were already overweight or had type 2 diabetes, and the vinegar was used alongside other dietary changes. Apple cider vinegar isn’t a shortcut, but the data suggests it can modestly support weight management in certain populations when used consistently.
Baking Soda for Heartburn
Baking soda is a legitimate short-term remedy for acid reflux. Dissolving half a teaspoon to one teaspoon in water neutralizes excess stomach acid quickly. It works because baking soda is alkaline, so it directly counteracts the acid splashing up into your esophagus.
This is a temporary fix, not a long-term strategy. Using baking soda repeatedly or in large amounts can push your blood chemistry too far in the alkaline direction, a condition called metabolic alkalosis. In one published case, a man who regularly consumed baking soda for gout developed severely alkaline blood, dangerously low potassium levels, acute kidney injury, and liver damage. Other case reports have documented confusion, loss of consciousness, and in rare instances, stomach rupture from the rapid release of carbon dioxide gas inside the stomach.
The Nutritional Reality of ACV
One persistent claim is that apple cider vinegar is rich in vitamins and minerals. It isn’t. A tablespoon contains about 3 calories, virtually no protein, no fiber, no vitamin C, and no vitamin D. It has roughly 11 mg of potassium and 1 mg of calcium. You’d get far more of both from a single bite of banana. Whatever benefits ACV offers come from its acetic acid content, not from nutritional density.
Risks to Teeth and Skin
Apple cider vinegar has a pH somewhere around 2.5 to 3.0, well within the range (pH 2.0 to 3.5) that erodes tooth enamel with frequent exposure. The American Dental Association flags acidic beverages in this pH range as a primary risk factor for dental erosion, and there’s some evidence linking heavy vinegar consumption to increased enamel wear. If you drink it regularly, using a straw and rinsing your mouth with plain water afterward helps limit contact with your teeth.
Baking soda poses a different problem when applied to skin. Your skin’s surface is naturally slightly acidic, which helps it retain moisture and defend against bacteria. Baking soda is alkaline enough to disrupt that protective layer, stripping away natural oils and leaving the skin more vulnerable to dryness, redness, breakouts, and bacterial inflammation. Dermatologists compare it to removing your skin’s natural armor. Even a single application can cause irritation, and repeated use compounds the damage.
Does Combining Them Make Sense?
For cleaning, the fizzy reaction between baking soda and vinegar can help loosen grime in drains or on surfaces. But for health purposes, the combination is largely self-defeating. The acid that gives apple cider vinegar its blood sugar and digestive effects gets neutralized by the baking soda. The alkalinity that lets baking soda calm heartburn gets neutralized by the vinegar. You end up with fizzy salt water and very little of what either ingredient does well on its own.
If you want the benefits of apple cider vinegar, dilute it in water (about a tablespoon in a full glass) and drink it before meals. If you need quick heartburn relief, dissolve a small amount of baking soda in water by itself. Using them separately preserves the specific chemistry that makes each one useful. Mixing them together mostly just makes bubbles.