Performance

Beta-Alanine

Amino acid that raises muscle carnosine and modestly improves anaerobic performance in adults doing HIIT or repeated sprints.

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Quick Take

Useful for HIIT, rowing, cycling, or repeated hard sets — otherwise low return for general wellness.

Beta-alanine is a nonessential amino acid found in animal foods mainly as part of carnosine and anserine. Supplementing raises muscle carnosine, which helps buffer acid during hard exercise. Best-supported benefits are modest improvements in anaerobic performance, fatigue resistance, and repeated-bout training volume. It helps most people doing HIIT, rowing, cycling, combat sports, or hard resistance training.

Potential benefits

Improves anaerobic performance

Improves training volume

Delays fatigue during hard efforts

May improve repeated-sprint output

May improve work capacity

Protocol

Amount

3.2-6.4 g

Frequency

Daily, split into 2-4 doses

When

Any time of day — consistency matters more than timing; split doses or use sustained-release to reduce tingling.

Onset Time

2-4 weeks for noticeable training effects; 8-12 weeks for fuller benefit

Who Should Consider

Adults doing HIIT or bootcamp-style classes

People who train with repeated hard intervals

Gym-goers doing high-rep or short-rest circuits

Recreational cyclists, rowers, and runners

Vegans or vegetarians doing intense training

Active older adults in supervised training

Food Sources

Chicken and turkey (carnosine/anserine source; amounts vary widely)
Beef and pork (carnosine source; amounts vary widely)
Fish such as tuna (carnosine/anserine source; amounts vary widely)

How It Works

Beta-alanine is the rate-limiting precursor for muscle carnosine. Higher carnosine helps buffer hydrogen ions that accumulate during hard exercise, so muscles resist the drop in pH and can sustain intense work a bit longer.

Updated 5/19/2026