Beta-Alanine
Delays muscular fatigue during high-rep or endurance-style training.
What is Beta-Alanine?
Beta-alanine is a non-essential amino acid that combines with histidine in muscle tissue to form carnosine. Carnosine acts as an intramuscular buffer, soaking up the hydrogen ions that accumulate during intense exercise and cause the burning sensation associated with fatigue. You can't supplement carnosine directly because it breaks down in the gut, so beta-alanine is the workaround.
What does the evidence say?
A 2012 meta-analysis by Hobson et al. in Amino Acids, covering 15 studies, found beta-alanine significantly improved exercise capacity for efforts lasting 1 to 4 minutes. Effects are most pronounced in the 60 to 240 second range, which maps well to sets of 12 to 20 reps. A 2010 paper by Derave et al. confirmed muscle carnosine increases of 40–80% after 4 weeks of supplementation at standard doses.
Multiple high-quality randomised controlled trials with consistent results and independent replication.
Dosage guide
| Effective dose | 3.2–6.4g per day |
| Maximum dose | 6.4g per day |
| Timing | Split into smaller doses of 0.8–1.6g to reduce tingling. Can be taken any time. |
Best form to buy
Standard beta-alanine powder. CarnoSyn is the patented form used in most studies, but generic beta-alanine is chemically identical.
Who benefits most
Best suited to men doing high-rep training, circuit work, or sport with repeated sprint efforts. Less relevant if your training is purely low-rep powerlifting.
Side effects and safety
Paraesthesia, a harmless tingling or flushing sensation, usually on the face, neck, and hands. Common at doses above 800mg in one go. Splits the dose and it largely disappears. Not a sign of anything harmful.
“Solid evidence, cheap, and genuinely effective for the right training style. The tingling throws people off but it's harmless. If you train in the 8 to 20 rep range, it's worth a try.”