L-Carnitine is a nitrogenous compound essential for energy production and fat metabolism. Carnitine exists in two isomeric forms namely L-Carnitine and D-Carnitine, of which L-Carnitine is the physiologically active form.
Usually, our body can make Carnitine from two essential amino acids, methionine, and lysine in the liver and kidneys. Its formation requires the presence of co-factors such as vitamin C, niacin, vitamin B6, and iron.
However, some people may not have enough Carnitine because their bodies could not make enough or can't transport it into tissues so it can be used. Some other conditions, such as angina, intermittent claudication, and usage of certain medications are also among the causes of low levels of Carnitine in the body.