negatively regulates negative regulation of catabolic process regulation of collagen catabolic process negative regulation of collagen catabolic process downregulation of collagen catabolic process down regulation of collagen catabolic process GO:0010711 negative regulation of collagen breakdown down-regulation of collagen catabolic process negative regulation of collagen catabolism biological_process Any process that decreases the rate, frequency or extent of collagen catabolism. Collagen catabolism is the proteolytic chemical reactions and pathways resulting in the breakdown of collagen in the extracellular matrix. negative regulation of collagen degradation negative regulation of collagen metabolic process collagen catabolic process biological regulation