Paul Saladino· MD
skin hair and nails is collagen but not just any collagen it's trachea and scapular collagen which is special types of collagen that have been studied by john pruden and they are full of unique peptides in addition to liver and bone marrow liver has lots of good nutrients in it for your skin vitamin k2 choline carnitine zinc and biotin which is something everybody thinks about with skin stuff and bone marrow of course many of the fatty acids and peptides there