What contains all nine essential amino acids?

A complete or whole protein contains all nine essential amino acids.

Explanation:

A complete or whole protein contains all the nine essential amino acids. In order to be considered 'complete' or 'whole', a protein must have these 9 amino acids which include: histidine, leucine, phenylalanine, isoleucine, lysine, methionine, threonine, tryptophan and valine.

Amino acids are the building blocks of the proteins. The above mentioned essential amino acids are obtained from the food we eat because they are not produced naturally by the body.

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