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Beta-alanine

Non-essential beta-amino acid, carnosine precursor. Supplement with IOC 2018 proven efficacy for 1-4 minute anaerobic performance

ATC code: A16AA-BETA-ALANINE

Brand names – supplements: Now Beta-Alanine, Optimum Nutrition Beta-Alanine, Bulk Beta-Alanine, CarnoSynSupplements are not tested in clinical trials and are not registered as medications.

Updated · Methodology

Indications

B

Athletic endurance

Adjunct

Beta-alanine is one of the few sports supplements with relatively convincing evidence. Saunders 2017 (BJSM) meta-analysis of 40 RCTs in 1461 subjects: beta-alanine 4–6 g/day × 4–12 weeks improves anaerobic performance by 2.85% in 1–4 minute exercise bouts (100–200 m swimming, 2000 m rowing, 4 km cycling, 1500 m running). Effect on shorter (<1 min) and longer (>10 min) exercises is minimal. IOC consensus statement 2018 included beta-alanine in the list of 5 sports supplements with proven efficacy (alongside creatine, caffeine, bicarbonate, nitrates). ISSN 2015 recommends beta-alanine 4–6 g/day × at least 4 weeks to increase intramuscular carnosine. For healthy non-athletes and aerobic training without anaerobic component the effect is not significant.

Sources

  1. IOC: IOC consensus statement: dietary supplements and the high-performance athlete (2018)
  2. ISSN: International Society of Sports Nutrition position stand: beta-alanine (2015)
  3. Br J Sports Med: Beta-alanine supplementation to improve exercise capacity and performance: systematic review and meta-analysis (2017)

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Muscle mass gain (bodybuilding self-use)

Not recommended

Beta-alanine is sold in pre-workout formulas as a «muscle gain» product. Evidence in skeletal muscle hypertrophy is weak: Trexler 2017 (Amino Acids) meta-analysis showed no significant beta-alanine effect on lean body mass vs placebo with standard resistance training. Beta-alanine works on delaying muscle fatigue in 1–4 minute anaerobic exercise, not hypertrophy. For muscle gain IOC 2018 and ISSN 2015 list creatine monohydrate (3–5 g/day), adequate protein (1.6–2.2 g/kg body weight), progressive overload and caloric surplus.

Sources

  1. Amino Acids: Beta-alanine supplementation and exercise performance: meta-analysis (2017)
  2. IOC: IOC consensus statement: dietary supplements and the high-performance athlete (2018)
How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Beta-alanine combines with L-histidine in skeletal muscle to form carnosine via carnosine synthase. Carnosine is an intramuscular hydrogen ion (pH) buffer; reduces H+ accumulation during anaerobic exercise, delaying muscle fatigue. Muscle carnosine concentration is the rate-limiting step, so exogenous beta-alanine 4–6 g/day × 4–12 weeks raises muscle carnosine by 40–80%. Bioavailability 100%, peak in 30–60 minutes, renal excretion. 2014 approved no physical performance health claim. IOC consensus statement 2018 included beta-alanine in the list of sports supplements with proven efficacy, alongside creatine, caffeine, bicarbonate and nitrates.

Safety

Contraindications

  • Pregnancy and lactation
  • Children under 18
  • History of beta-alanine allergic reactions
  • Severe renal impairment

Serious adverse effects

  • Allergic reactions (rare)

Common adverse effects

  • Paraesthesia (tingling and burning in face, neck, hands skin) – dose-dependent, resolves in 60–90 minutes
  • Facial flushing
  • Nausea at large single doses

Pregnancy: can you take Beta-alanine?

No RCT data in pregnancy. AEMPS does not register as medicine. Avoid in pregnancy.

Breastfeeding: can you take Beta-alanine?

No data on milk transfer. Lactating women should avoid.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

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Frequently asked

What is Beta-alanine used for?

Beta-alanine is evaluated for the following indications with varying evidence strength: Athletic endurance (evidence tier B), Muscle mass gain (bodybuilding self-use) (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Beta-alanine?

Common side effects of Beta-alanine (≥ 1 in 100): Paraesthesia (tingling and burning in face, neck, hands skin) – dose-dependent, resolves in 60–90 minutes, Facial flushing, Nausea at large single doses. See the Safety section for uncommon and serious reactions.

Is Beta-alanine safe during pregnancy?

No RCT data in pregnancy. AEMPS does not register as medicine. Avoid in pregnancy.

Is Beta-alanine compatible with breastfeeding?

No data on milk transfer. Lactating women should avoid.

Who should not take Beta-alanine?

Beta-alanine is contraindicated in: Pregnancy and lactation; Children under 18; History of beta-alanine allergic reactions; Severe renal impairment. Full list in the Safety section.

Other drugs in this group

Betaine (trimethylglycine, TMG), Chlorophyll (chlorophyllin copper-sodium complex), Cytoflavin (succinic acid, nicotinamide, riboflavin, inosine complex), D-aspartic acid (DAA), Gamma-aminobutyric acid (GABA), L-citrulline (free form and L-citrulline malate for sports formulas), L-tyrosine, Taurine