Generally people say supplemental protein usually means supplemental protein, food protein sources are divided into animal protein and plant protein, animal protein has a higher bioavailability than plant protein, mainly from fish, meat, eggs, milk and other animal foods, while plant protein from soybeans and their products, cereal food, nuts. I. Animal protein: 1, meat, fish and shrimp: meat protein is mainly concentrated in lean meat, such as beef, lamb, pork, chicken, duck, goose, etc., can be used as a good source of supplementary protein. Fish and shrimp, such as striped bass, tuna, carp, carp and other sea fish and river fish, as well as sea shrimp, river shrimp, etc., are good foods to supplement protein; 2, eggs: among various eggs, commonly eggs, duck eggs, etc., which are rich in protein with a high absorption rate, and the presence of calcium, iron and other elements, is a good choice to supplement human protein, minerals, etc.; 3, milk: commonly include Cow’s milk, goat’s milk or yogurt, etc., the protein content is high, you can choose according to whether you tolerate. Plant protein: mainly includes beans or soy products, the most common is soy, which contains higher vegetable protein in all plant foods. In addition, cereals can be used as the main source of protein for the body when animal food intake is insufficient, and plant protein can also be supplemented by walnuts, peanuts, melon seeds, sesame seeds, pine nuts, etc. In special cases, such as insufficient dietary intake or severe hypoproteinemia, protein can be quickly supplemented by protein powder.