The nine essential amino acids which cannot be produced by human bodies are as follows:

Phenylalanine, Threonine, Valine, Tryptophan, Methionine, Leucine, Isoleucine, Lysine, and Histidine.

Milk, Eggs, Red and White Meats, Fish, and varied Plants such as Eggplants contain complete proteins, which being made up of the 20 different amino acids, contain the nine essential amino acids and are released when consumed.