Essential Amino Acids: Definition, Functions

Amino acids are organic compounds that combine to form proteins that the body uses for various functions.

Such as growth, digestion, tissue restoration, and many metabolic processes that take place inside cells.

And they are also necessary for the production of hormones, enzymes, and neurotransmitters.

This article tells you everything you need to know about essential amino acids and their functions in your body.


The essential amino acids included nine types, which cannot be manufactured in sufficient quantities in the human body.

But you must consume daily from the food that contains them, and the failure to obtain enough of any acid from these amino acids leads the body to resort to analyzing the proteins present in Muscle.

To get enough of these acids; This is due to the inability of the body to store the surplus from it for later use.

Here we mention the essential Amino Acids:



The following points explain the functions of the essential amino acids:

  • ISOLEUCINE: Isoleucine helps in wound healing, stimulates the immune system, eliminates toxins from nitrogenous waste, and promotes the secretion of many hormones. Isoleucine is essential for the formation of hemoglobin.
  • HISTIDINE: Histidine is used to produce histamine, a neurotransmitter that is vital to immune response, digestion, sexual function and sleep-wake cycles. It’s critical for maintaining the myelin sheath, a protective barrier that surrounds your nerve cells.
  • LEUCINE: It is usually available in large quantities in food sources that contain high-quality protein. It is the protein that contains all the essential amino acids and has a role in metabolism to produce the energy needed to manufacture these proteins.
  • LYCINE: Lysine is essential for calcium absorption and protein synthesis. Such as collagen, elastin, production of enzymes, hormones, and energy, in addition to its role in the functions of the immune system.
  • METHIONINE: Methionine plays an important role in metabolism and detoxification. It’s also necessary for tissue growth and the absorption of zinc and selenium, minerals that are vital to your health, also it is one of the three amino acids that the body needs to produce creatine, which is essential for building muscle and producing energy.
  • THREONINE: It is an essential component of structural proteins, Examples: collagen and elastin, which are an essential part of skin and connective tissue, and contribute to lipid metabolism and immune functions.
  • PHENYLALANINE: Since it is essential in the manufacture of many other amino acids, and important for the construction and functioning of some proteins and enzymes, it should be noted that phenylalanine is transformed into tyrosine, which is included in the manufacture of some neurotransmitters, such as dopamine, and norepinephrine.
  • VALINE: Valine contributes to maintain mental activity, emotional stability, and coordination in communication between the central nervous system and muscle movement, and is obtained from food and nutritional supplements that contribute to energy production, muscle growth, tissue regeneration, and repair.
  • TRYPTOPHAN: It is essential for the growth of infants, and it enters into chemical reactions to form some hormones, Calmatonin, which regulates sleep, in addition to serotonin, it is one of the neurotransmitters that regulate appetite, mood, sleep and pain.


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