A method for increasing, enhancing, or improving volume retention at a region to be treated in a patient, comprising a step of implanting a composition in, on, or proximate to the region to be treated in the patient, thereby forming an implantation site, wherein the composition comprises:
- (a) an adipose component which is a delipidized, decellularized adipose tissue-derived matrix;
- and
- (b) a fascia component which is a decellularized fascial tissue-derived matrix;
- wherein the adipose component and fascia component are present in the composition in a predetermined ratio of adipose component:fascia component in a range of from about 99:1 to about 1:99 on a weight basis;
- whereby the composition provides greater volume retention at an implantation site after passage of a minimum period of time from implantation of the composition in a subject;
- and
- wherein volume retention is greater compared to a composition having a predetermined ratio of 100:0.