Hi there! Just considered I might mention that collagen will come from the gristle / connective tissue and pores and skin. The marrow offers the inventory nutrients and flavor but If the desirous to Have a very inventory higher in collagen which is so fantastic for our joints and skin, https://frozen-chicken-feet-for-s82594.thenerdsblog.com/33114649/frozen-chicken-feet-no-further-a-mystery