| Caseins (αs1, αs2, β , and κ) | 26 | 28 | 14.000–22.000 | Ion carrier (Ca, PO4, Fe, Zn, Cu), precursor for bioactive peptides immunomodulatory, anticarcinogenic. |
| β-Lactoglobulin | 8.0 | 3.3 | 18.400 | Vitamin carrier, potential antioxidant, precursor for bioactive peptides, fatty acid binding. |
| α-Lactalbumin | 3.0 | 1.2 | 14.200 | Effector of lactose synthesis in mammary gland, calcium carrier, immunomodulatory, precursor for bioactive peptides, potentially anticarcinogenic. |
| Immunoglobulins | 20–150 | 0.5–1.0 | 150.000–1,000.000 | Specific immune protection through antibodies and complement system, potential precursor for bioactive peptides. |
| Glycomacropeptide | 2.5 | 1.2 | 8.000 | Antimicrobial, antithrombotic, prebiotic, gastric hormone regulator. |
| Lactoferrin | 1.5 | 0.1 | 80.000 | Antimicrobial, antioxidative, anticarcinogenic, anti-inflammatory, iron transport, cell growth regulation, precursor for bioactive peptides, immunomodulatory, stimulation of osteoblast proliferation. |
| Lactoperoxidase | 0.02 | 0.03 | 78.000 | Antimicrobial, synergistic effects with immunoglobulins, lactoferrin and lysozyme. |
| Lysozyme | 0.0004 | 0.0004 | 14.000 | Antimicrobial, synergistic effects with immunoglobulins, lactoferrin and lactoperoxidase. |
| Serum albumin | 1.3 | 0.3 | 66.300 | Precursor for bioactive peptides. |
| Milk basic protein | N.A | N.A | 10.000–17.000 | Stimulation of osteoblast proliferation and suppression of bone resorption. |
| Growth factors | 50 μg–40 mg/L | <1 μg–2 mg/L | 6.400–30.000 | Stimulation of cell growth, intestinal cell protection and repair, regulation of immune system. |