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Peptides Powder is also called Nano Oligopeptide Collagen (OCO, Nano active Oligopeptide Collagen, or Nano Collagen for short), also known as Oligopeptide, micro peptide, short peptide. Small peptides generally refer to oligopeptides composed of 2-3 amino acids, with an average molecular weight of about 300 daltons. The final products of protein (collagen) digestion in the digestive tract are usually small peptides rather than free amino acids. Small peptides can be completely absorbed and enter the blood circulation in the form of two or three peptides. Small peptides play an important role in protein nutrition.