Beta-alanine: a scientifically proven dietary supplement against muscle fatigue

The sports nutrition market is saturated with products promising miraculous improvements in performance. The specialist literature and scientific consensus, however, place only a narrow group of substances among the genuinely functional, or ergogenic, food supplements. Alongside creatine, caffeine and nitrates, this elite company also includes beta-alanine, for which there is strong evidence of its ability to help delay muscle fatigue during intense exercise.

How it works: the fight against acid and acidification

To understand the benefit of beta-alanine, we have to look at what happens in the muscles at high intensity. During short, very intense efforts the muscles get their energy from anaerobic glycolysis, which leads to a high production of lactic acid and a rapid build-up of hydrogen ions (H⁺). It is precisely the accumulation of these ions that causes a sharp drop in pH in the muscle (intracellular acidosis), which disrupts muscle contraction and leads to a rapid onset of severe fatigue.

Fortunately the body has built-in mechanisms for defending itself against this “acidification" with the help of so-called buffers. Inside the muscle cells this role is played above all by a dipeptide called carnosine. The level of carnosine in the body cannot, however, be raised simply by eating carnosine – it would be broken down in the digestive tract and its absorption into the muscles is very poor.

The solution is precisely beta-alanine, which (together with the amino acid L-histidine) is the building block for producing carnosine directly in the body. Specialist studies show convincingly that regular intake of beta-alanine can increase carnosine stores in human skeletal muscle by up to 80 % (Harris et al., 2006; Hill et al., 2007). The result is a dramatically better ability of the muscles to “mop up" hydrogen ions and resist fatigue from acidification.

Who is beta-alanine for?

Beta-alanine is not a universal solution for all types of sport. It has the greatest effect in high-intensity exercise lasting 30 seconds to 10 minutes, where the main and primary cause of muscle failure is precisely the acidosis mentioned above.

In summary, beta-alanine does not have to serve only as a means of improving performance on race day. Current evidence suggests that its main benefit may lie in its ability to support the quality and volume of training, which in turn creates the conditions for long-term improvement in sports performance (Trexler et al., 2015; Saunders et al., 2017; Lancha et al., 2015).

How to dose beta-alanine correctly

For beta-alanine to work, you cannot just take it right before a race or training session; it requires long-term “saturation" of the muscles. The current supplementation protocol based on research:

The results of using beta-alanine in data

Synergy with bicarbonate of soda

Because beta-alanine acts as a buffer inside the muscle cells (intracellularly), in professional sport it is often combined with supplementation with bicarbonate of soda (sodium bicarbonate). Bicarbonate of soda works as an excellent buffer outside the cells in the bloodstream (extracellularly). Research suggests that the effects of the two substances could add up, which was shown for example in a slight improvement in times in 2000 metre rowers. This combination can therefore push the limits of coping with fatigue to the absolute maximum, but you have to be careful with the correct dosage of the soda because of the risk of digestive problems (Hobson et al., 2014).

Conclusion for athletes

Beta-alanine belongs to a very exclusive club in sports nutrition – the handful of supplements whose effectiveness in improving performance has been convincingly and repeatedly demonstrated by scientific studies. It is not a magic potion that would replace hard graft, but it is a reliable physiological tool for the moments when your muscles find themselves in the fire of lactic acid. Beta-alanine does not work like caffeine, which “kicks in" within an hour. Success lies in long-term, systematic saturation of the muscles. The key is to take 3.2 to 6.4 grams every day for at least 4 to 12 weeks. Only then does the carnosine level rise enough to create an effective intracellular shield against acidification.

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