There are a few complete sources of protein for vegans such as hemp and quinoa. (drjockers.com)
This is not a very wise choice for most people because the only complete source of protein found in nature comes from animals. (westonaprice.org)
In addition, animal protein sources are complete sources of protein because the protein found in meat, fish, eggs and dairy is similar to the protein found in the body and includes all the essential amino acids that the body needs. (fitnessandpower.com)