Edible fungi, such as Lentinus edodes, Pleurotus ostreatus, auricularia auricula, etc.

Collagen, such as pigskin, trotters and fish skin.

Vegetables and cereals, peanuts, corn, bitter gourd, etc. Have peptides.

Meat foods also contain peptides.

Extended data:

Compounds in which amino acids are linked to each other through amide bonds are called peptides. Peptides with an amino acid content of less than 10 are called oligopeptides, and those with an amino acid content of more than 10 are called polypeptides. A polypeptide with more than 50 amino acids is called protein.

Polypeptides can be extracted from many animals and plants, such as walnuts, corn, peas, bitter gourd, mung beans, rice, peanuts and seafood in plants, and wood frogs, deer and turtles in animals, which are more nutritious and beneficial to the body.

References:

Food-borne peptides _ Baidu Encyclopedia