A complete protein (or whole protein) is a source of protein that contains an adequate proportion of all of the essential amino acids for the dietary needs of humans or other animals. This does not refer to the protein source only containing all the essential amino acids, but also containing them in complete proportion for use by the human body. A source may contain all essential amino acids, but contain one in lower proportion to the others, making it an incomplete protein.

In order to be a complete protein, the source must contain all essential amino acids, and contain them in complete proportion for use by the body. The following table lists the optimal profile of the essential amino acids, which comprises a complete protein : Complete proteins contain adequate amounts and proportions of these essential amino acids.

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