Baking soda is AIP compliant. It contains only one ingredient, sodium bicarbonate, which is a simple mineral compound with no immune-stimulating proteins, seed-based additives, or other components restricted on the Autoimmune Protocol. The amounts used in baking are small enough that it poses no issue for most people following the elimination phase.
Why Baking Soda Passes but Baking Powder Doesn’t
This distinction trips up a lot of people. Baking soda is pure sodium bicarbonate and nothing else. Baking powder, on the other hand, combines sodium bicarbonate with two acids and typically cornstarch. One common acid used is sodium aluminum sulfate; the other is monocalcium phosphate. Corn is eliminated on AIP because it’s a grain, so any baking powder containing cornstarch is off the table during the elimination phase. Even “aluminum-free” baking powders usually still contain cornstarch or another non-compliant filler.
If a recipe calls for baking powder, you can substitute baking soda paired with an acid. A common AIP-friendly approach is combining half a teaspoon of baking soda with one teaspoon of apple cider vinegar. This produces the same carbon dioxide gas that makes baked goods rise, without introducing any restricted ingredients.
How to Use Baking Soda in AIP Baking
Baking soda needs an acid to activate. In conventional baking, that acid often comes from buttermilk, yogurt, or brown sugar, but on AIP you’ll rely on different sources. Apple cider vinegar is the most popular option. Lemon juice, cream of tartar (which comes from grapes, not grains), and coconut cream with a splash of vinegar also work. The key ratio is roughly one part baking soda to two parts acid by volume.
Because AIP flours like cassava, tigernut, and coconut flour behave differently than wheat, the leavening effect of baking soda alone may be subtler. You won’t get the same dramatic rise as a wheat-based muffin, but the combination does lighten the texture noticeably. Mix your baking soda with dry ingredients and add the acid just before baking, since the gas starts forming immediately on contact.
Baking Soda vs. Medicinal Doses
The amount of baking soda in a batch of muffins or pancakes is tiny, usually a quarter to half a teaspoon spread across multiple servings. That’s very different from the larger doses some people take as an antacid or alkalizing agent. For heartburn, the typical dose is half a teaspoon dissolved in water, and maximum recommendations cap out at about five teaspoons per day for short-term use.
At higher doses, sodium bicarbonate neutralizes stomach acid and produces carbon dioxide gas, which can cause bloating, gas, and discomfort. For someone on AIP who already has gut sensitivity, this matters. The small amounts in baked goods won’t meaningfully alter your stomach acid or cause these effects. But if you’re considering drinking baking soda dissolved in water as a remedy, that’s a separate question from whether it’s AIP compliant as an ingredient.
Sodium Content Worth Noting
Baking soda is high in sodium. A single teaspoon contains roughly 1,260 milligrams, which is more than half the daily limit many people aim for. Again, when you’re using a quarter teaspoon in a recipe that makes 12 servings, the sodium per serving is minimal. But if you’re also using baking soda as an antacid or consuming it in multiple recipes daily, the sodium can add up. This is particularly relevant if you’re managing fluid retention, high blood pressure, or kidney issues alongside an autoimmune condition.
What to Look for When Buying
Plain baking soda from any major brand is just sodium bicarbonate. There are no hidden ingredients to worry about. Check the label to confirm it lists only sodium bicarbonate, though this is standard. Some specialty “baking soda” products marketed for cleaning may have added fragrances or detergents, so stick with one labeled for cooking.
Store it sealed in a cool, dry place. Baking soda loses potency over time as it absorbs moisture from the air. If yours has been open for more than six months, test it by dropping a small amount into vinegar. If it fizzes vigorously, it’s still active. If the reaction is weak, replace it for better results in your baking.