Collagen is an elastic protein naturally found in the human body’s connective tissues. As people age, the amount of collagen naturally present in the body diminishes. This causes sagging of the facial skin, crows feet, and the typical aged skin effect. This is where the entire collagen cream industry comes to play.
When it comes to effectiveness, my first findings in Google are about 50/50. It seems half the people swear it works, and the other half is sure it doesn’t. This is going to be a lot of work.