Beta-alanine
Summary
Beta-alanine raises muscle carnosine, which buffers acid during hard efforts. Meta-analyses found a small overall performance benefit, mainly in efforts lasting about 30 seconds to 10 minutes, with little effect under 60 seconds. Trials used about 1.6-6.4 g/day for 4-8 weeks or longer. Tingling skin (paresthesia) is the common side effect.
Key facts
- Beta-alanine powder or capsules; sustained-release tablets. Carnosine itself is an inefficient way to raise muscle carnosine[1]
- Divided doses or sustained-release forms reduce tingling (paresthesia); no head-to-head performance data between forms in our sources[1][6]
- Exercise capacity and performance ↑ small (B, 40 studies); efforts of 60–240 s ↑ (B); muscle carnosine ↑ 23–39% after 5–6 weeks (D)[2][3][4]
- 1.6–6.4 g/day, usually in divided servings, for 4–8 weeks in most trials[1]
- Appears safe at 1.6–6.4 g/day for up to 8 weeks; no safety data beyond 1 year. Single doses ≥800 mg or >10 mg/kg can cause tingling for 60–90 minutes[1]
- ISSN and the AND/DoC/ACSM position statement support benefits for high-intensity exercise lasting about 1–4 minutes; a Department of Defense review found the evidence insufficient[1][6]
- 4 graded human outcomes on this page
- October 8, 2026
How it works
EstablishedBeta-alanine is the rate-limiting precursor for carnosine (beta-alanyl-L-histidine) in skeletal muscle. Carnosine buffers the hydrogen ions that build up during high-intensity anaerobic exercise, so higher muscle carnosine may delay the drop in muscle pH that limits force (established for carnosine loading; performance effect proposed). Muscle carnosine responses vary widely between people.[1][4]
What the human research says
Human trials only, one row per outcome. The form column shows what each trial actually tested. Grades follow our evidence-grading policy.
| Outcome | Effect | Grade | Best evidence | PMID |
|---|---|---|---|---|
| Exercise capacity and performance | Improved | Grade B | Meta-analysis · n = 1,461 · 2017 Healthy participants in 40 double-blind, placebo-controlled studies Form: beta-alanine (chronic supplementation) · Dose: Varied; total amount ingested did not moderate the effect · Duration: Varied across trials Small overall benefit (effect size 0.18; 95% CI 0.08 to 0.28). Effects were larger for exercise capacity than for performance in 0.5-10 min tasks, and training status did not change the effect. | 27797728 (opens PubMed)Source [2] |
| Exercise lasting 60-240 seconds | Improved | Grade B | Meta-analysis · n = 360 · 2012 Participants in 15 published studies (174 beta-alanine, 186 placebo) Form: beta-alanine · Dose: Median total of 179 g over the supplementation period · Duration: Varied across trials Exercise lasting 60-240 s and >240 s improved vs placebo, but exercise under 60 s did not. The median improvement was 2.85%. | 22270875 (opens PubMed)Source [3] |
| Physical working capacity in older adults | Improved | Grade D | RCT · n = 44 · 2013 Men and women around age 70 (mean 70.7) Form: oral nutritional supplement fortified with beta-alanine · Dose: 800 or 1200 mg beta-alanine, twice per day, in a protein drink · Duration: 12 weeks Physical working capacity at fatigue threshold rose 17.8% (800 mg) and 13.6% (1200 mg), significantly more than the drink alone; body composition and grip strength did not change. | 23832078 (opens PubMed)Source [5] |
| Muscle carnosine content | Improved | Grade D | PK study · n = 15 · 2009 Untrained young men, placebo-controlled Form: beta-alanine · Dose: 4.8 g/day beta-alanine · Duration: 5-6 weeks, then 9 weeks of washout Muscle carnosine rose 39% in soleus, 27% in tibialis and 23% in gastrocnemius, and returned to baseline within 9 weeks after stopping. High responders (+55%) took 15 weeks to wash out vs 6 weeks for low responders (+15%). | 19131472 (opens PubMed)Source [4] |
Forms
| Form | Elemental % | Absorption (human data) | GI tolerance | Studied for |
|---|---|---|---|---|
| Beta-alanine (instant-release powder or capsules) | Varies[1] | No head-to-head human data vs sustained-release in our sources.[1] | Single doses of at least 800 mg or above 10 mg/kg can cause tingling of the face, neck, hands and upper trunk lasting 60–90 minutes; itchy skin also reported.[1] | Most performance trials |
| Sustained-release beta-alanine | Varies[1] | No head-to-head human performance data in our sources.[1] | ODS and ISSN report it can attenuate paresthesia.[1][6] | Tolerance |
| Carnosine | Varies[1] | Digested into its amino acids, so oral carnosine is an inefficient way to raise muscle carnosine (ODS).[1] | No form-specific tolerance data in our sources.[1] | Not studied in the trials graded here |
Studied doses
Doses studied in human trials ranged from 1.6 to 6.4 g/day of beta-alanine, typically split into smaller servings, for about 4 to 12 weeks. Safety data beyond 1 year are lacking.[1][4][5]
Interactions
Published interactions only: each row cites a source. No row means none was found in our sources, not that a combination is safe.
None found in our sources.
Who should be careful
- Tingling and itching
- Beta-alanine commonly causes harmless but sometimes intense tingling (paresthesia) for 60–90 minutes after single doses of 800 mg or more; itchy skin has also been reported.[1]
- Long-term use
- Safety has been studied at 1.6–6.4 g/day for up to 8 weeks; there are no safety data for use beyond 1 year.[1]
- Competitive athletes
- ODS notes that some products sold for exercise performance have been adulterated with undeclared ingredients and that third-party certification offers some independent assurance of content.[1]
- Before you start
- Talk to your pharmacist or clinician before adding this supplement, especially if you take prescription medicines, are pregnant or breastfeeding, or have a chronic health condition.[1]
Talk to your pharmacist or clinician before starting a supplement, especially if you take prescription medicines.
Articles about Beta-alanine
Plain-English answers to common questions, built on the evidence above.
Frequently asked questions
Why does beta-alanine make my skin tingle?
Paresthesia is a common, harmless reaction to single doses of about 800 mg or more (or over 10 mg/kg). It usually affects the face, neck, hands and upper trunk and fades within 60–90 minutes. Smaller divided servings or sustained-release forms reduce it.[1][6]
What kind of exercise does beta-alanine help?
Benefits are clearest for hard efforts lasting about 1 to 4 minutes, such as rowing or swimming events, and smaller for longer efforts. A meta-analysis found no benefit for efforts under 60 seconds.[3][2][1]
How long does it take to work?
Benefits depend on building muscle carnosine over weeks. In one study, 4.8 g/day for 5–6 weeks raised muscle carnosine by 23–39%; the ISSN reports benefits after at least 2–4 weeks at 4–6 g/day.[4][6]
Is beta-alanine safe?
It appears safe at 1.6–6.4 g/day for up to 8 weeks in healthy people; tingling and itchy skin are the main side effects, and there are no data beyond 1 year.[1]
Sources
- [1]Dietary Supplements for Exercise and Athletic Performance: Fact Sheet for Health Professionals. NIH Office of Dietary Supplements, 2024. fact-sheet
- [2]β-alanine supplementation to improve exercise capacity and performance: a systematic review and meta-analysis.. Br J Sports Med, 2017. meta-analysis
- [3]Effects of β-alanine supplementation on exercise performance: a meta-analysis.. Amino Acids, 2012. meta-analysis
- [4]Carnosine loading and washout in human skeletal muscles.. J Appl Physiol (1985), 2009. PK-study
- [5]Oral nutritional supplement fortified with beta-alanine improves physical working capacity in older adults: a randomized, placebo-controlled study.. Exp Gerontol, 2013. RCT
- [6]International society of sports nutrition position stand: Beta-Alanine.. J Int Soc Sports Nutr, 2015. guideline
What changed
- First draft. Every evidence-row PMID checked with NCBI E-utilities (esummary + efetch abstract) and re-read in an independent adversarial pass.