Aspects of the present disclosure include methods for preparing biocomposites having viable stem cells and platelets. Methods according to certain embodiments include combining a composition that contains viable stem cells with a composition the contains platelets in a centrifugation vessel, subjecting the centrifugation vessel to a force of centrifugation to produce two or more fractions such that each fraction includes a component having different density and collecting a fraction from the centrifuge vessel that includes the platelets and viable stem cells. Liquid biocomposites having viable stem cells and platelets and methods for administering the biocomposites to a body site of a subject are also provided.
