Why Baking Soda Gives You Stomach Cramps Before Working Out (And What to Do Instead)

You've probably heard that athletes take sodium bicarbonate — baking soda — before training to push harder and delay fatigue. So you tried it. And 20 minutes later you were bloated, cramping, and sprinting to the bathroom instead of the squat rack.

Here's the thing: the science behind it is completely real. The delivery method is just broken.

Why it happens

The moment baking soda hits your stomach acid, it triggers a chemical reaction that produces CO₂ gas. That gas has nowhere to go fast. Your stomach distends, you bloat, you cramp, and your body tries to push it through your system as quickly as possible. The higher your dose — and you need roughly 0.3g per kilogram of bodyweight to get the actual performance benefit — the worse the reaction.

It's not an allergy. It's not a sensitivity. It's just basic chemistry happening in the wrong place.

What elite athletes figured out

Pharmaceutical-grade supplements use something called enteric coating — a pH-sensitive polymer shell that protects the capsule from dissolving in your stomach acid. It only opens when it reaches your small intestine, where the pH is higher and absorption is actually more efficient.

The CO₂ reaction never happens in your stomach. The bloating never happens. You get full absorption of the sodium bicarbonate directly into your bloodstream — which is exactly where it needs to be to buffer lactic acid during your workout.

The difference in practice

Athletes who switch from raw baking soda to enteric-coated sodium bicarbonate consistently say the same thing: it feels like using it for the first time. Because for most of them, GI distress was blocking the performance benefit the entire time.

pHastr is an enteric-coated sodium bicarbonate supplement sourced from natural Colorado mineral deposits, built specifically for athletes who want the buffering benefit without sacrificing their gut. Take it 90–120 minutes before training. No cramps, no bloating, no bathroom detours.

If baking soda has made you sick before, the compound didn't fail you. The format did.