Beta-alanine is one of the few supplements that international expert organizations include in the group with proven effectiveness. Its well-known "side effect" - tingling of the skin - is familiar to many who have tried pre-workout complexes. The editors tell what kind of substance it is, how it works and for which loads it makes sense.
What is beta-alanine
Beta-alanine is a non-essential amino acid, that is, the body is able to synthesize it by itself, mainly in the liver. Unlike the usual alanine (alpha-alanine), the amino group in beta-alanine is located in a different position of the molecule. Because of this, beta-alanine is not part of proteins and is not used to build muscle fibers directly.
Its main physiological role is to be a "raw material" for the synthesis of carnosine dipeptide. Carnosine consists of two components: beta-alanine and histidine. Histidine in the muscles is usually enough, while beta-alanine is not enough, so it is he who limits the rate of carnosine formation.
With food, beta-alanine comes mainly in the composition of carnosine and related dipeptides (anserine), which are contained in meat, poultry and fish. Vegetarians get much less of it, and their carnosine content in muscles, according to research, is on average lower.
As a supplement, beta-alanine is sold as a separate powder or capsules, and is also included in many pre-workout complexes. It is not on the WADA Prohibited List.
Carnosine: the main actor
Carnosine is present in large concentrations in skeletal muscles, especially in fast fibers of type II, which are involved in intense, explosive efforts. That is why sprinters and representatives of strength sports usually have higher levels of carnosine than non-exercising people.
The key discovery that made beta-alanine popular belongs to the group of Roger Harris. In a study by Harris et al. (2006) showed that taking beta-alanine increases muscle carnosine, whereas direct carnosine intake is less effective because it is broken down in the gut and blood.
The next study by Hill et al. (2007) showed that muscle carnosine increased by an average of approximately 60% over 4 weeks of supplementation and approximately 80% over 10 weeks. At the same time, the ability to perform high-intensity work on a bicycle ergometer improved.
An important feature: carnosine accumulates slowly and is just as slowly excreted from the muscles. After discontinuation of the drug, its level returns to normal within several months. This means that beta-alanine, like creatine, works through accumulation rather than a "one time" effect.
Mechanism of action: acidity buffer
During intense exercise, when energy is actively produced through anaerobic glycolysis, hydrogen ions accumulate in the muscles. The acidity of the environment increases, which disrupts the work of enzymes and contractile proteins and contributes to the development of fatigue.
Carnosine acts as an intracellular buffer: it is able to bind hydrogen ions and thereby slow down the drop in pH inside the muscle fiber. Its chemical structure provides a buffering effect precisely in the pH range that is characteristic of a working muscle.
In addition to the buffer function, other potential roles have been described for carnosine: influence on the sensitivity of the contractile apparatus to calcium, antioxidant properties, binding of some reactive metabolic products. Their contribution to the athletic effect in humans is debated, but the main mechanism remains a buffering effect.
It is important to understand the limits of this mechanism. Beta-Alanine does not provide additional energy and does not increase the strength of the direction. It only allows you to maintain high intensity longer, when acidification itself becomes the limiting factor.
For which loads it works
The "target window" of beta-alanine also emerges from the mechanism. The greatest benefits are seen with high-intensity efforts lasting approximately 30 seconds to 10 minutes, especially in the 1-4 minute range. These are the conclusions drawn by the meta-analysis authors Hobson et al. (2012) and ISSN positions on beta-alanine (2015).
Short bursts of up to 30 seconds rely mostly on phosphocreatine, so beta-alanine is of little help there. At long aerobic distances, acidification is not the main factor in fatigue, and the effect becomes small.
- running 400–1500 m, swimming 100–400 m, rowing 2000 m;
- pursuit races, track cycling;
- martial arts with intensive rounds;
- interval training and crossfit complexes;
- game sports with repeated intense segments.
The average effect in studies is small in percentage terms, but in a sport where the winner is determined by fractions of a second, it can be practically significant. However, expectations should be realistic: beta-alanine does not turn an amateur into a prize winner.
Beta-alanine and creatine: what's the difference
Beta-Alanine and Creatine are often confused or mentioned together because both work through muscle accumulation and both have a good evidence base. But their mechanisms and target loads are different.
| Index | Beta-alanine | Creatine monohydrate |
|---|---|---|
| What accumulates in the muscles | Carnosine | Creatine and phosphocreatine |
| Main mechanism | Buffering of hydrogen ions | Fast recovery of ATP |
| Optimal duration of effort | ~30 s – 10 min, especially 1–4 min | Up to ~30 s, repeated efforts |
| Time to full effect | Weeks–months | About 1 week with loading, up to 4 weeks without |
| Characteristic side effect | Paresthesia (tingling) | Body weight gain |
| Direct effect on strength | Minimum | Pronounced |
Since the mechanisms are different, these supplements do not compete, but complement each other. Some studies of the combination have shown a small additional effect, although there is less data on the combination than on each supplement alone.
The choice depends on the type of sport: creatine is more important for powerlifters and sprinters, and beta-alanine is more important for middle-distance and interval athletes. Many sports athletes can benefit from both.
Editorial conclusions
Beta-alanine is an amino acid that limits carnosine synthesis in muscles. Regular intake increases the content of carnosine, which, in turn, helps to buffer acidification during intensive work.
Beta-alanine is most beneficial in efforts lasting from half a minute to several minutes; for maximum strength and long-term endurance, the effect is small.
This is a "long-acting" supplement: the effect appears after weeks of regular intake, not after a single serving.
To learn more, read our "Beta-Alanine Benefits for Athletes: The Evidence Base," "How to Take Beta-Alanine: Dosage, Timing, Duration," and "Beta-Alanine Side Effects."
List of used literature
- Trexler ET, Smith-Ryan AE, Stout JR, et al. International society of sports nutrition position stand: Beta-Alanine. J Int Soc Sports Nutr. 2015;12:30.
- Harris RC, Tallon MJ, Dunnett M, et al. The absorption of orally supplied beta-alanine and its effect on muscle carnosine synthesis in human vastus lateralis. Amino Acids. 2006;30(3):279â289.
- Hill CA, Harris RC, Kim HJ, et al. Influence of beta-alanine supplementation on skeletal muscle carnosine concentrations and high intensity cycling capacity. Amino Acids. 2007;32(2):225â233.
- Hobson RM, Saunders B, Ball G, Harris RC, Sale C. Effects of β-alanine supplementation on exercise performance: a meta-analysis. Amino Acids. 2012;43(1):25â37.
- Blancquaert L, Everaert I, Derave W. Beta-alanine supplementation, muscle carnosine and exercise performance. Curr Opin Clin Nutr Metab Care. 2015;18(1):63â70.
- Maughan RJ, Burke LM, Dvorak J, et al. IOC consensus statement: dietary supplements and the high-performance athlete. Br J Sports Med. 2018;52(7):439â455.
