Nutrafol uses hydrolyzed marine collagen peptides because of its bioavailability. Studies show that the smaller the molecule, the easier it is to migrate through the body and be used where needed. Our Collagen Infusion was formulated with marine collagen that was hydrolyzed from large molecules (300,000 Daltons) to substantially smaller ones (3,000 - 4,000 Daltons) so they can get to where they need to go more efficiently.