nothing
Collagen is a protein yes. Protein is a broad category of molecules.
No, collagen is a Fibrous protein. An example would be insulin.
collagen is a form of protein
Structural Protein
Yes it is
Protein
yes it is.
collagen
No. Well, yes. It depends on what you mean by "amino acid." Collagen is a protein and is therefore made up of amino acids rather than being an "amino acid" (as the term is generally used) itself. In a strict chemical sense, though, it is in fact an amino acid, as it contains both a carboxylic acid functional group and an amine functional group (at the C-terminal and N-terminal ends of the protein respectively).
Collagen is a structural protein found in the body, giving strength and support to tissues such as skin, bones, and connective tissues.
Collagen
No, collagen is a type of protein and retinol is a pure form of Vitamin A.