How it works
Beta-alanine combines with histidine in muscle to form carnosine, a molecule that buffers hydrogen ions. During intense exercise, hydrogen ions accumulate and contribute to fatigue by interfering with muscle contraction. Beta-alanine is the limiting ingredient for carnosine production, so daily supplementation raises muscle carnosine by roughly 40–80% over 4–10 weeks. The effect depends on building carnosine stores over time, so a single dose before a workout does nothing for performance.
What research supports
- Improves performance in high-intensity efforts lasting roughly 30 seconds to 10 minutes, such as 400–1500 m running, rowing and swimming events
- May increase training volume in repeated high-intensity sets
- May delay neuromuscular fatigue, particularly in older adults
- Effects on single short sprints, maximal strength and long endurance events are small or uncertain
Dosage
Typical research dose: 3.2–6.4 g per day (about 65 mg/kg/day), divided into doses of 0.8–1.6 g every 3–4 hours, for at least 2–4 weeks and ideally longer. Sustained-release forms may reduce tingling.
Timing
What counts is taking it every day, since the goal is to raise muscle carnosine over weeks. Splitting the total into smaller doses with meals cuts the tingling and may slightly improve carnosine gains, because food appears to improve retention. You don't need to take it right before training.
Side effects
- Paresthesia: a harmless tingling or prickling sensation on the skin, usually on the face, neck and hands, lasting up to about an hour after larger doses
- Mild stomach discomfort in some people
Cautions
- Long-term safety data beyond about a year are limited
- People with medical conditions or who are pregnant should talk to a doctor before use
- Often included in pre-workout blends at doses too low to be effective; check the label
- Athletes subject to anti-doping rules should only use products certified by an independent third-party testing program for banned substances; certification lowers, but does not eliminate, the risk of contamination.
Food sources
Beef, Chicken, Pork, Fish (provide carnosine and anserine rather than free beta-alanine).