Beta-alanine
Carnosine precursor with substantial meta-analysis support for high-intensity exercise performance, especially 60s–4min duration efforts.
Why
β-alanine is a non-proteinogenic amino acid and the rate-limiting precursor for muscle carnosine. The Saunders 2017 BJSM meta-analysis (40 RCTs, n=1,461) and the International Society of Sports Nutrition position stand confirm performance improvements at 4–6 g/day over 4+ weeks, particularly for exercise lasting 60 seconds to 4 minutes. The 'paraesthesia' (skin tingling) is the characteristic acute side effect.
How it works
Loaded into skeletal muscle as carnosine (β-alanyl-L-histidine), where it acts as a major intramuscular pH buffer, delaying acidosis-mediated fatigue during high-intensity efforts.
Expected onset · Performance effects emerge after 4 weeks; full effect over 8–12 weeks
How to take
Dosage
4–6 g/day divided into smaller doses (0.8–1.6 g) to minimise paraesthesia. Loading phase over 4–12 weeks builds muscle carnosine; effect plateaus after about 12 weeks.
Timing
Divided 3–4 times daily with meals
On the label
Stated grams per serving. CarnoSyn is the most-studied trademarked form. Sustained-release forms reduce paraesthesia.
Ideal for
Athletes and active adults engaged in repeated high-intensity efforts (track running 800m–1mile, rowing, cycling sprints, combat sports, CrossFit); older adults exploring sarcopenia adjuncts.
Safety
Evidence
Saunders 2017 BJSM meta-analysis (40 RCTs, n=1,461): β-alanine improved exercise outcomes for efforts lasting 30 sec to 10 min, with greatest effect at 60 sec to 4 min duration. ISSN 2015 position stand: supplementation at 4–6 g/day for ≥2 weeks is safe and improves performance, with carnosine effects via intramuscular pH buffering.
- Saunders et al., Br J Sports Med 2017, β-alanine supplementation to improve exercise capacity and performance: meta-analysis
- Trexler et al., J Int Soc Sports Nutr 2015, International Society of Sports Nutrition position stand: Beta-Alanine
- Hill et al., Amino Acids 2007, influence of beta-alanine supplementation on skeletal muscle carnosine concentrations and high-intensity cycling capacity
Where to get it
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