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 (Beta-alanine)

Brand names – supplements

Now Beta-Alanine, Optimum Nutrition Beta-Alanine, Bulk Beta-Alanine, CarnoSyn

Supplements are not tested in clinical trials and are not registered as medications.

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.

Indications

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

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.

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

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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

PregnancyFDA N

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

Breastfeeding

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.

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?

FDA category N. 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.

Mechanism of action

Indications

Athletic endurance

Adjunct

Sources

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

PregnancyFDA N

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

Breastfeeding

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.

Frequently asked

What is Beta-alanine used for?

What are the side effects of Beta-alanine?

Is Beta-alanine safe during pregnancy?

FDA category N. 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.