What is the difference between marine and bovine collagen?

Marine collagen is made from the skins/scales of fish, while bovine collagen (sometimes referred to as "grass-fed" collagen) is made from cowhides.
Marine collagen peptides have a lower molecular weight than bovine peptides (smaller particle size) making them more bioavailable and effective.
Wild-caught marine collagen like Landish's is also guaranteed to be free of hormones and antibiotics, which is almost never the case for bovine collagen.
Finally, Landish's marine collagen is Canadian-made whereas no bovine collagen is made in Canada - the vast majority of it is imported from Asia.

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