As natural biopolymers, hydrolyzed collagens are made of a group of molecules of different size and length that can be described by two chief characteristics that are the average molecular weight (Mw) and the molecular weight distribution.

when defining hydrolyzed collagen, the molecular weight of the protein decreased during the extraction and hydrolysis process. 

the molecular weight of hydrolyzed collagens used in food products from market, have relatively wide spectrum ranging from 2000 to 20000 Daltons.

However, extreme molecular weights are quite unusual and most of the hydrolyzed collagens show an average molecular weight between 3000 and 7000 Daltons. 

It is important to understand now that there is no standard method for the measurement of molecular weight meaning results of molecular weight highly depend on the method used. One has thus to test collagen with the very same method in order to rank and compare commercial products.(More)