protein material, food, drink or feed, bone strengthening agent, bone strengthening methods, preparation of protein material, and production of protein material
The invention relates to a protein material includes angiogenin and/or angiogenin hydrolysate in an amount of 2 to 15 mg/100 mg, and cystatin and/or cystatin hydrolysate in the mass ratio to angiogenin and/or angiogenin hydrolysate of 0.003 to 0.6..