the present invention discloses a novel milk - fermented product comprising a group of peptides . the peptides are composed from no . 1 to no . 7 of the figure that is selected from the group consisting of fig . 11 to fig . 18 . and the novel milk - fermented product is used for suppressing the reduction of bone mineral density . therefore , the novel milk - fermented product could be a component of foods , nutrient supplement or medicine for treating or preventing osteoporosis .