The Substrate of Pepsin is Proteins.
The Product of it is Peptides and Amino Acids.
The Source of Pepsin can found in the lining of the stomach and can be found in all animals.
The enzyme is used during digestion and breaks-down things in the into peptides and amino acids and makes it easier for it to be absorbed by the intestinal lining. it Important cause it give us some the amino acids we need.
Temperature of Pepsins is between 37 °C and 42 °C and pH is 1.5 to 2.