Beta-alanine

What beta-alanine is

Beta-alanine is a non-essential beta-amino acid. The body produces it itself, and people who eat meat and fish take in an additional 200 to 400 mg per day through food, according to the BfR’s estimate. In muscle, beta-alanine combines with histidine to form the dipeptide carnosine. Because histidine is abundant, the supply of beta-alanine determines how much carnosine is formed.

In retail, beta-alanine is found mainly in pre-workout products. For Germany, the BfR counted a total of 88 newly launched products containing beta-alanine between January 2023 and April 2026; only one contained it as the sole ingredient. The recommended daily intakes on the labels ranged from 450 to 6,400 mg per day.

A buffer that can be measured

During intense work, the pH in muscle drops, and at some point the acidification slows contraction. Carnosine captures part of the hydrogen ions. More carnosine means more buffer, and a hard effort can be sustained somewhat longer.

What is special is that this chain has been measured in humans. In 2006, Harris and colleagues gave 3.2 or 6.4 g daily for four weeks, divided into single doses of 400 or 800 mg, and determined carnosine by biopsy: content rose by an estimated 42.1 and 64.2 percent respectively. After 10 weeks, Hill and colleagues measured an increase of 80.1 percent in 2007. In the longest study, over 24 weeks with 6.4 g daily, content rose by 119 percent on average according to the BfR and reached a plateau between week 20 and week 24.

An analysis of individual data from 99 people arrived at an estimated response rate of 99.3 percent. The question is therefore not whether the store fills up, but how much performance results from it.

What reaches the training

The first meta-analysis, by Hobson and colleagues in 2012, pooled a total of 15 papers with 360 participants. Efforts of 60 to 240 seconds improved markedly, longer efforts still benefited, and below 60 seconds no benefit was seen. The mean effect was 2.85 percent.

The largest analysis, by Saunders and colleagues from 2017, comprises 40 double-blind, placebo-controlled studies with 1,461 participants and arrives at an effect size of 0.18. The duration of the effort was the decisive moderator; training status played no role. Tests to exhaustion benefited more than time trials over a fixed distance, and the combination with sodium bicarbonate achieved the largest effect size compared with placebo, 0.43.

More recent work confirms the pattern: in trained young men, Georgiou and colleagues found an effect size of 0.39 across 18 studies with 331 participants in 2024, and as much as 0.55 for maximal efforts of 4 to 10 minutes.

User reports: the tingling

The BfR cites reports from users on online sales platforms describing a temporary tingling or numbness in the face and arms; some interpret it as a sign that the product is working or is good. That is a report, not proof of efficacy. The paresthesias run parallel to the rapid rise in blood levels, and sustained-release products that barely tingle still fill the store in the studies.

In controlled measurements with 25 healthy men, the sensations peaked about 20 minutes after intake: 29 percent reported tingling, 19 percent tickling or itching, 16 percent hot flushes. According to the BfR, this usually subsides on its own within 60 to 90 minutes and leaves no detectable damage to the nerves. What matters is the size of the single dose, not the daily amount.

What the studies show

Saunders 2017, the large meta-analysis

Only double-blind, placebo-controlled studies with chronic intake, crossover designs excluded. 40 studies with 65 exercise protocols and 1,461 participants. Overall effect size 0.18, confidence interval 0.08 to 0.28. Exercise duration significantly moderated the effect, whereas training status and total amount of beta-alanine did not.

Hill 2007, carnosine and performance in step

Placebo-controlled study with 13 men over 4 weeks, 8 of them over 10 weeks, with muscle biopsies from the thigh. Carnosine rose by 58.8 percent after 4 weeks and by 80.1 percent after 10 weeks, but not in the control group. The work performed in a cycling test at 110 percent of maximal power rose by 13.0 percent after 4 weeks and followed the rise in carnosine.

Saunders 2017, the longest study

Placebo-controlled study with 25 active men over 24 weeks with 6.4 g daily as a sustained-release product, with a biopsy and cycling test every 4 weeks. Carnosine rose at every measurement point, and capacity in the high-intensity cycling test improved. According to the BfR, liver and kidney values remained unchanged, and the taurine level in muscle did not fall.

Liang 2026, the counter-finding for sprints

Multilevel meta-analysis of 17 randomized studies on repeated sprints. Neither mean nor peak power nor the performance decrement improved; for mean sprint power, the standardized mean difference was minus 0.018. Dose, duration, type of sport and training status made no difference to this. Short sprints depend mainly on creatine phosphate, not on acid buffering.

Where the data stop

The effect is small and tied to a particular type of effort. For repeated short sprints, the meta-analysis of 17 studies shows no advantage, and in 2014 EFSA considered a health claim on performance in short, high-intensity exercise to be unsubstantiated. On cognition, the data are inconsistent: a study with 100 older people and 2.4 g daily over 10 weeks found no overall difference in the MoCA test, only an improvement of 11.8 percent in a subgroup with weaker baseline values; in trained cyclists and in young men before simulated military stress, cognition remained unchanged. For an antioxidant effect in muscle, there are only blood markers from a few small studies; a 2018 review found just 4 suitable papers and appeared as a preprint. In women, the evidence is considered very low despite a positive direction.

Status, approval and legal

In Germany, beta-alanine is on the market as an ingredient of dietary supplements; there is no health-based guidance value. In August 2026, the BfR assessed in Opinion No. 046/2026: single doses below 400 mg and less than 1.2 g spread over the day are considered safe for healthy adults, intake should remain under 12 weeks, and products should exclude children, adolescents, pregnant and breastfeeding women and people aged 65 and over. There is no authorized health claim. In France, a medicine with 400 mg beta-alanine against menopausal hot flushes is available, and Poland limits dietary supplements to 2,400 mg per day and 800 mg per single dose. In sport, beta-alanine is considered permitted; the French authority ANSES classifies it as a non-prohibited substance.

Safety

The most thorough risk assessment to date, by Dolan and colleagues from 2019, evaluated 101 human studies and 50 animal studies. The only reported side effect was paresthesia, with an odds ratio of 8.9 compared with placebo; dropout rates did not differ. The liver value ALT rose slightly but remained within the reference range, and the taurine level in muscle did not change in humans. The BfR nevertheless rates the quality of the safety data as poor: most studies recorded side effects incompletely and included almost exclusively young, healthy men, and there are no data beyond 24 weeks. Mild paresthesias can occur even at single doses of around 10 mg per kilogram of body weight, about 700 mg at 70 kg, and considerably more often at 800 to 1,000 mg. Sustained-release formulations with up to 1.6 g are often tolerated without relevant tingling. The European Medicines Agency sees robust indications of rare anaphylactic reactions, and the BfR recommends a corresponding warning.

Sources

• Saunders et al., Br J Sports Med 2017
• Hobson et al., Amino Acids 2012
• Harris et al., Amino Acids 2006
• Hill et al., Amino Acids 2007
• Saunders et al., Med Sci Sports Exerc 2017
• Liang et al., Front Nutr 2026
• Dolan et al., Adv Nutr 2019
• Trexler et al., J Int Soc Sports Nutr 2015 (ISSN position stand)
• BfR, Opinion No. 046/2026
• EFSA NDA Panel, EFSA Journal 2014