A solubilized protein composition is obtained from avian eggshell membrane without the use of proteolytic enzymes or cross-linking agents. The composition is essentially odor-free, has an ash content of less than 10% by weight of the composition and a protein content of at least 90% by weight of the composition including a mixture of solubilized proteins such as Type I collagen. Type V collagen. Type X collagen, elastin, lysozyme, ovotransferrin, desmosine, and/or B-N-acetylglucosaminidase, wherein the solubilized proteins are undenatured and retain biological activity.