L-carnitine is a biologically active substance that is naturally present in the body. It is a safe and effective substance that plays a crucial role in fat breakdown and energy production in the human body. Its primary role is to transport fatty acids into the mitochondria – the cell's "power plants," where, among other things, the breakdown of fatty acids takes place. This is why the highest concentrations of carnitine are found in tissues that primarily use fatty acids as a source of energy, such as the heart and skeletal muscles.
In a healthy body under normal conditions (absence of mental and physical stress), the body produces enough carnitine in the liver and kidneys to meet its needs. Carnitine is then transported from the liver and kidneys to the aforementioned tissues that use fatty acids as an energy source. In addition to the amino acids lysine and methionine, the body also needs vitamin C, vitamin B6, niacin, and iron for L-carnitine production.
Natural sources of carnitine include red meat, especially beef, as well as wheat, avocados, asparagus, and peanuts. While these foods contain carnitine, significant amounts of this nutrient cannot be obtained through diet alone. Therefore, supplementary intake is necessary, especially for those aiming to burn fat and improve physical performance. According to numerous studies, L-carnitine affects muscle growth and development, increases energy, muscle fatigue resistance, and aids in post-exercise recovery.