Greetings!

Incomplete proteins are missing, or do not have enough of, one or more of the essential amino acids, making the protein imbalanced.

• Most plant foods (such as beans and peas, grains, nuts and seeds, and vegetables) are incomplete protein sources.
• Gelatin has no tryptophan (an essential amino acid), very low levels of Branched-chain amino acid and high levels of non-essential amino acids, so it is an outlier in the world of animal proteins.

Hope this answers your question clearly.

Good Luck!

Dear Amaya,

The incomplete protein is gelatin or collagen.

Regards