Some amino acids are called essential because they cannot be synthesized by the human body and must be obtained from the diet. These essential amino acids include:

- Histidine

- Isoleucine

- Leucine

- Lysine

- Methionine

- Phenylalanine

- Threonine

- Tryptophan

- Valine

The body can synthesize the remaining amino acids, called non-essential amino acids, from other compounds. However, some non-essential amino acids may become conditionally essential under certain circumstances, such as illness or stress.

It is important to consume a diet that provides all the essential amino acids in adequate amounts to maintain good health. Foods that are rich in protein, such as meat, fish, eggs, dairy products, beans, and nuts, are good sources of essential amino acids.