The protein fraction of milk contains different two main groups of proteins, caseins and whey proteins. Peptides are relatively small sequences of amino acids and in this case whey peptides are these small proteins that are found in the fraction that is dissolved in the serum after the precipitation of caseins. Whey proteins are proteins of high nutritional quality, they resist heartburn quickly passing to the intestine and producing a relatively rapid increase in the concentration of amino acids available in the blood.

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Peptides are also released during digestion or hydrolysis of proteins, in fact most of the proteins are absorbed in the form of peptides and not as free amino acids. When the size of the peptides is more than three amino acids they are hydrolyzed by the enzymes of the intestinal brush border, while the small peptides, di peptides and tri peptides can be absorbed and reach the bloodstream without altering their structure which allows them In addition to supplying amino acids, exercising functions in the gastrointestinal tract or at a general level. These peptides with biological functions are called bioactive peptides and among some of their functions are to modify cell metabolism, act as vaso-regulators, growth factors, hormonal inducers, immunomodulators or neurotransmitters.

Many of these peptides are inactive within the sequence of the original protein and during gastrointestinal digestion or enzymatic hydrolysis, they are released and acquire their properties.

Main bioactive peptides present in whey:


It is the largest protein. It represents around 50-55% of whey proteins. It is a source of essential amino acids and BCAA’s. Involved in different metabolic actions such as muscle protection, glycogen savings during exercise, the improvement in the absorption of fat-soluble vitamins, has antihypertensive, antimicrobial, antioxidant, anticarcinogenic, immunomodulatory, opioid or hypocholesterolemic among others.


Protein present in the serum that represents around 20-25% of the protein fraction. Excellent source of essential amino acids, BCAA’s, tryptophan and cysteine. Its consumption shows antihypertensive, antimicrobial, prebiotic, immunomodulatory, opioid and even anticancer. It has been linked to stress reduction and prevention of cognitive impairment.


10-15% environment of whey protein. IgA, IgD, IgE, IgM. The most important is IgG. They act as antibodies protecting against infections and pathogens since they are capable of reducing the adhesion of microorganisms, bacterial metabolism, eliminating bacteria as well as neutralizing toxins and viruses. They enhance immune function and are present in bovine colostrum.


Glycopeptide that is cleaved from the kappa casein molecule during the precipitation of caseins in the cheese-making process, represents 10-15% of the protein fraction. It is rich in branched chain amino acids (BCAA’s), deficient in methionine and does not contain phenylalanineIt has the ability to neutralize microbial toxins, inhibit the adhesion of cariogenic bacteria and viruses such as influenza, regulates the immune system, promotes the growth of bifidobacteria and regulates blood circulation with antihypertensive and antithrombotic action. In addition, it reduces gastric secretions, stomach mobility and stimulates the release of satiety-related hormone such as cholecystokinin. It has benefits on brain development and enhances learning. It inhibits the formation of dental plaque and tooth decay. It does not contain phenylalanine so it is usually used in food for phenylketonuria.

Bovine serum albumin

It represents 5-10% of the protein and is large. It has the ability to bind to fats and mobilize them in the body to obtain energy or form membranes. It has antioxidant capacity, protecting fats from oxidation and also inhibits tumor factors.


It is found in colostrum and milk; it represents only 1-2% of the protein content. It is considered a molecule with defensive, antimicrobial, antioxidant, anti-inflammatory, anti-cancer and with properties on the regulation of the immune system.

Growth factors

They are found mostly in bovine colostrum, especially during the first hours of the calf’s birth and their concentration decreases over time. The main applications of bovine colostrum growth factors are skin disorders, gastrointestinal health, bone health, arthritis or reducing side effects of the consumption of nonsteroidal anti-inflammatory drugs.

What is it for?

Whey peptides pass quickly through the gastrointestinal tract until they reach the area of the intestine where they are absorbed. If the peptide size is adequate, it passes into the bloodstream without being hydrolyzed to smaller forms or free amino acids. In this way it is possible to raise plasma amino acids more rapidly and to a greater extent than to consume other forms of proteins or even that free-form amino acids. Additionally, some peptides present in the serum have additional health benefits such as modulation of the immune system or anti-inflammatory properties. You can get peptides serum online from Peptides Pharma Grade store.