Does Baking Soda Actually Improve Running Performance? Here's What the Research Says

The research is real

Sodium bicarbonate is one of the most studied legal performance supplements in sports science. It's been researched since the 1980s across track and field, rowing, cycling, and swimming. A 2021 meta-analysis found an average performance improvement of roughly 1.7% in high-intensity events. Multiple studies on 400m and 800m runners show 1–2 second improvements in race times with acute bicarbonate loading.

The mechanism is well understood. Your muscles produce hydrogen ions during hard running that lower your muscle pH and force you to slow down. Sodium bicarbonate raises blood pH before the run, creating a buffer that extends how long your muscles can keep firing before acidosis shuts them down.

It's most effective for races lasting 1–8 minutes — which covers 400m through 3000m on the track, and hard intervals for any distance runner.

Why most runners say it doesn't work

The standard protocol is 0.3g per kilogram of body weight. For a 70kg runner, that's 21 grams of baking soda. That's a significant amount of a compound that reacts aggressively with stomach acid and releases CO₂ gas. The result: severe bloating, cramping, nausea, and diarrhea in 30–50% of people who try it.

Most runners try it once, have a horrific experience, and write off the entire concept. They conclude it doesn't work. What actually happened is the delivery method made the supplement unusable.

What actually works

Enteric-coated sodium bicarbonate uses a pharmaceutical coating that resists stomach acid and only dissolves in the small intestine. The CO₂ reaction never happens in your stomach. No bloating, no cramping, no GI distress. The bicarbonate absorbs cleanly into your bloodstream and does exactly what the research says it does.

pHastr is an enteric-coated sodium bicarbonate supplement built specifically for this. Natural mineral source from Colorado, designed around the 0.3g/kg protocol, taken 90–120 minutes before a race or hard interval session.

If you've tried baking soda before and wrote it off — the science didn't let you down. The baking soda did.