Leucine - the Enigmatic Component of Intricate BCAA
Sophia Williams
2026-03-25
3 min. read
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BCAA is one of the most widely used substances in the sports world, concealing behind its acronym three exogenous amino acids that are indispensable for achieving the desired outcomes. One of them is leucine, whose benefits I shall strive to discuss in detail in the subsequent sections of this article.
What is Leucine?
Leucine is an organic chemical compound and one of the most significant exogenous amino acids. It is primarily found in albumins and blood plasma components. This substance is obtained either synthetically or through protein hydrolysis. It is often identified by its abbreviated name - HICA. Its well-known isomer is isoleucine. Both of these substances, along with valine, form a popular supplement for athletes known as. When seeking leucine in natural products, it is advisable to focus mainly on meat, dairy products, eggs, fish, and certain plant foods.
Leucine – Action and Properties
Leucine is one of the most important amino acids for the body of an exercise worker. What does it mean? First of all, its anti-catabolic nature. It is worth mentioning that apart from being an exogenous amino acid, leucine belongs to a group of ketogenic compounds. One of its derivatives is ketoleucine, which is produced as a result of numerous metabolic reactions of the body, including the reduction of cortisol, a stress hormone responsible for a range of harmful changes in our body, starting with protein breakdown and increased glucose synthesis, through salt retention and increased potassium excretion, to increased production of gastric juice and the release of calcium from bones. Clearly, leucine is a guardian of our anabolism. It is also worth noting that leucine is one of the most important compounds responsible for the building of muscle mass. It affects the mTOR kinase (which you can read about in the article on leucine), leading to an increased synthesis of muscle proteins and the rate of this process. Furthermore, it also influences the process of growth hormone synthesis. By searching the literature, one can often find information on the use of leucine for the reduction of fat tissue. There are several reasons for its use, starting with the protection against cortisol and its negative effects on the body, through the stimulation of glucogen production, which is responsible for maintaining a normal blood sugar level, to increasing the sensitivity to insulin and the normalization of blood cholesterol levels.
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The recommended leucine supplementation is around 1500 mg per day, which should be divided into three smaller doses of 500 mg each. Other sources suggest that a single dose of leucine should be between 5 and 10 g per day. It is recommended to take the supplement during training and immediately upon waking up. Leucine is considered one of the most universal supplements in sports, regardless of the type of physical activity and level of advancement. Numerous studies confirm its effectiveness in preventing protein breakdown, loss of fat tissue, and inhibition of glucose degradation. If you are not convinced of its health benefits, it is worth spending time reviewing scientific literature.
Deficiency and Excess
Leucine deficiency is typically an unusual phenomenon. The reason for the exceptionally low level of this amino acid can be a very modest diet, which includes only a few food items. However, the indications of this condition are: - fatigue, - muscle weakness, - pain and dizziness, - deterioration of mood, - increased pain sensitivity. Similarly, the case with an excess of leucine is. Although this is very rare, it usually occurs in sports enthusiasts who are too young and impatient. One of the symptoms is the disturbance of the nitrogen balance in the body, which can lead to liver dysfunction. Another typical consequence of leucine overdose is the so-called pellagra. Its symptoms include abdominal pain, diarrhea, bloating, bright red swelling, vomiting, and excessive fatigue or insomnia.
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