Firmness and Elasticity
Collagen is one of the principal proteins that form the structure holding the skin together in the Extra Cellular Structural Matrix (ECM).
Collagen Synthesis repairs and replaces damaged collagen structures/fibers.
Collagenase/Matrix Metalloproteinase (MMP-1) is a protein/enzyme that important for breaking down damaged or worn structures to make way for immune cells to come in to prep collagen synthesis to take over repairing the damaged structures. MMPs are important to the natural physiological process because they break down damaged or worn structural proteins, promote wound healing and clear pathways for immune cells to travel to infected areas. 
When there is overproduction of MMP-1 (collagenase), the breakdown of collagen occurs faster than it is synthesized. Collagenase, an enzyme also known as Matrix Metalloproteinases (MMP’s), accumulates due to overproduction caused by genetic or environmental factors. Collagenase creates breakdown of both unhealthy and healthy collagen fibers faster than the collagen fibers can be synthesized.
In healthy skin, there is a balance of MMP-1 and collagen, so redundant and damaged collagen is degraded at nearly the same speed as it is synthesized.