The immunopotentiator of collagen peptide includes that those have 2,000-12,000 average molecular weight. It is immune to increase, the score for including the sum of immune score as indicator is assigned to following seven parameters, when score 1 (, hypoimmunity, 2 (medium is immune), or 3 (height immune) be assigned to the measured value of immunity in correspondence with by fixed price difference three level established in advance every seven parameters: immunocyte quantity, CD8-positive CD28-positive immunocyte quantity, CD4-positive T cell/CD8-positive immunocyte ratios, na ve immunocyte quantity, na ve T cells/memory immunocyte ratio, B cell quantity, natural killer cells quantity.
