Hydrolyzed collagen is produced from collagen found in the bones, skin, and connective tissue of animals. The process of hydrolysis involves breaking down the molecular bonds between individual collagen strands and peptides using combinations of physical, chemical or biological means. Typically, with skin-sourced collagen (Type-I collagens), hides are put in a lime slurry pit for up to 3 months, loosening collagen bonds; the hides are then washed to remove lime, and the collagen extracted in boiling water.