Science Library

Beta-alanine

Moderate evidence

EnduranceStrength

Dose

4-6 g/day

Timing

Daily, any time

Loads in

2-4 weeks

Best for

1-4 min efforts

Does it work?

-A little — for the right job. Loading 4-6 g/day for several weeks raises muscle carnosine, which buffers acid build-up and modestly helps all-out efforts in the ~1-4 minute (up to ~10 min) range: repeat sprints, 400-1500 m, rowing, hard intervals, high-rep "burn" sets. The gain is small (about 2-3% for recreational athletes, less in elites) and it does nothing for single max lifts or efforts under a minute.

How much · when

-Take 4-6 g per day, every day — it works by slowly building muscle carnosine, not as a pre-workout. Timing within the day doesn't matter.
-Expect 2-4 weeks of consistent dosing before benefit; carnosine keeps climbing for ~12 weeks, so be patient.
-Split the daily total into small servings — around 0.8 g taken several times a day. This limits the tingling AND is the pattern that showed up in the trials that actually improved strength and power.
-Be wary of sustained-release tablets as the tingling fix. A 2025 review found that studies using sustained-release formats or single large servings often failed to improve performance, even at high total doses.
-It earns its keep in training that makes muscle acidic — repeated submaximal efforts, short rest intervals, high-volume hypertrophy work. Pure low-volume strength work with long rests is where it does least.

The catch

-The effect is genuinely small (~2-3% recreational, ~0.5-1% elite) and shows up mainly in a narrow window of high-intensity work.
-The strength and power picture is less settled than it looked. A 2025 review of nine studies found fragmented dosing of 4-6.4 g/day over 5-8 weeks did improve maximal strength and power outcomes — but that is nine small studies and 197 people, so treat it as a promising refinement rather than a reversal.
-It still does nothing useful for a single 1-rep max or a sprint under a minute; the mechanism is acid buffering, and those efforts don't produce enough acid to buffer.

Safety

-Safe in healthy people at recommended doses. The only common side effect is paraesthesia — a harmless skin-tingling 10-20 min after a dose — which fades with smaller split doses or sustained-release tablets.
-Long-term safety data beyond a few months is limited but reassuring; nothing concerning has emerged.
-If you're pregnant, on medication, or managing a health condition, check with a clinician first.

Key research

Supplements

CreatineStrong Sodium bicarbonateModerate

Educational information, not medical advice. Talk to a healthcare professional before starting a supplement — especially if you're pregnant, nursing, or managing a health condition.