Most baking powder is gluten-free — baking soda, an acid salt, and cornstarch.
Usually yes. Baking powder is sodium bicarbonate (baking soda), one or more acid salts, and a drying starch. None of the leavening chemicals is a grain, and major U.S. brands use cornstarch, which is gluten-free. The single thing to check is the starch: corn = gluten-free; the rare brand using wheat starch is not. Choose a baking powder labeled gluten-free or one that lists corn starch.
Most baking powder is gluten-free. It’s a leavening blend — baking soda plus an acid salt plus a little starch to keep it dry. The leavening chemicals are never grain. The one thing to glance at on the label is which starch it uses.
What’s in Baking Powder
Baking powder is sodium bicarbonate (baking soda), one or more acid salts (monocalcium phosphate, sodium acid pyrophosphate, sometimes cream of tartar), and a starch. Per FDA labeling rules, the gluten-containing grains are wheat, barley, rye, and their hybrids — the leavening chemicals are not grains, and major U.S. brands use cornstarch, which is gluten-free.
Cross-Contamination Risk
Manufacturing
Low
- Leavening chemicals + corn starch; no gluten grain.
- Major U.S. brands use gluten-free cornstarch.
- Only a rare wheat-starch product is a concern.
Bakery
Low
- The baking powder itself is gluten-free.
- A shared wheat-flour bakery is a separate cross-contact risk.
- The gluten in a baked good comes from flour, not baking powder.
Home
Low
- Corn-starch baking powder is gluten-free.
- Verify the rare wheat-starch product; store away from wheat flour.
Baking Powder — GF Status
- Baking powder with corn starch — gluten-free
- Baking powder labeled “gluten-free” — gluten-free
- Aluminum-free baking powder (corn-starch) — gluten-free
- Baking powder with wheat starch (rare) — NOT gluten-free — read the label
- Baking soda (sodium bicarbonate) — gluten-free (single ingredient)
What to Look For — Or Avoid
- Starch listed as corn starch
- A “gluten-free” label where available
- Leavening chemicals only (baking soda + acid salt)
- “Wheat starch” in the ingredient list (rare but possible)
- Confusing baking powder with a self-rising/flour product (that has wheat)
- Assuming the gluten in a baked good comes from baking powder (it’s the flour)
Frequently Asked Questions
Is baking powder gluten-free?
Usually yes. Baking powder is baking soda plus an acid salt plus a drying starch. None of the leavening chemicals is a grain, and major U.S. brands use cornstarch, which is gluten-free. Check the starch — corn is gluten-free; the rare wheat-starch product is not.
What’s the difference between baking powder and baking soda for gluten?
Both are gluten-free in standard form. Baking soda is single-ingredient sodium bicarbonate (always gluten-free). Baking powder adds an acid salt and a starch — gluten-free when the starch is cornstarch.
Could baking powder contain wheat?
Rarely. The only realistic gluten source in baking powder is wheat starch used instead of cornstarch, which is uncommon in U.S. products. Read the ingredient list or choose a baking powder labeled gluten-free.
Is aluminum-free baking powder gluten-free?
Yes, if it is corn-starch-based. Aluminum-free vs. regular baking powder is about the acid salt used, not gluten. Both are gluten-free when the starch is cornstarch.
Is cream of tartar in baking powder gluten?
No. Cream of tartar (potassium bitartrate) is a byproduct of winemaking, not a grain. It is gluten-free, whether used alone or as the acid in some baking powders.
Can people with celiac disease use baking powder?
Yes. Corn-starch baking powder is gluten-free and safe for celiac disease. Just verify the starch is corn (not wheat) or choose a baking powder labeled gluten-free; the gluten in any baked good comes from the flour, not the baking powder.