Patent ID: 8420599

Claim:
A milk protein fraction degradation product obtained by degrading, with trypsin, chymotrypsin, or pepsin, a milk protein fraction having following characteristics (1) to (4): (1) the milk protein fraction is derived from milk, (2) the milk protein fraction comprises proteins and each protein in the milk fraction has a molecular weight of 6000 to 150,000 daltons determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE), (3) when considered together, the proteins in the milk protein fraction are 12 to 14 percent of basic amino acids by weight of the constituent amino acid composition, and have a basic amino acid/acidic amino acid ratio of 0.5 to 0.7, and (4) the milk protein fraction has a promoting effect on calcification in an osteoblast.