Bioactive ingredients are extra-nutritional constituents that are found in small quantities in foods providing health benefits beyond the basic nutritional value of the product. They can be sourced from plants, animals or can be synthetically produced. Bioactive ingredients, though not essential for the sustainability of the body but lead to better health. They are present in small quantities in foods and affect the body. For instance, apart from nutrients milk also provides several physiological benefits, especially from the bioactive peptides encrypted within the protein, released upon digestion. These peptides demonstrate many bioactivities such as antioxidant, hypotensive, hypocholesterolemic, anticancer and immunomodulation properties, and many others.