I was researching this topic to see if any peptides existed that were isolated from Ratfish-aka Chimaera monstrosa- Liver to help rejuvinate the pineal gland via decalcification. As I understand it, ratfish liver oil is a lipid-based supplement though I've read that bioactive peptides could theoretically be isolated from the liver tissue itself (the solid matter left after oil extraction) through enzymatic hydrolysis. Thus far, I've researched a couple of sites that carry peptides but don't see any Ratfish Liver-based products. Ratfish liver oil is hard to come by, expensive due to the fish being endangered.