What is Dipalmitoyl Hydroxyproline ? Dipalmitoyl Hydroxyproline is based on plant-derived hydroxproline (Collagen Amino Acids) and represents one of the most powerful, state of the art, weapons against aging skin.  This plant-derived biological delivery system for hydroxyproline  which is a collagen amino acid with well characterized moisturizing activity is created by grafting palmitic acid onto the hydroxyproline. Dipalmitoyl Hydroxyproline is an overall …