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A peptide is a compound in which two or more amino acids are connected by a peptide chain through condensation. Generally, no more than 50 amino acids are connected. A peptide is a chain-like polymer of amino acids.

Amino acids are the smallest molecules and proteins are the largest molecules . Multiple peptide chains undergo multi-level folding to form a protein molecule.

Peptides are bioactive substances involved in various cellular functions in organisms. Peptides have unique physiological activities and medical health care effects that original proteins and monomeric amino acids do not have, and have triple functions of nutrition, health care, and treatment.

Small molecule peptides are absorbed by the body in their complete form. After being absorbed through the duodenum, the peptides directly enter the blood circulation.