Antihypertensive peptides were obtained after the proteolysis of beta-casein by starter cells Lactococcus lactis ssp. lactis and lactococci with pepsin or fromase. The peptides have shown the effect as inhibitors of angiotensin-converting enzyme. The strongest action the peptide obtained after the proteolysis of beta-casein by synergic action of lactococci with pepsin has shown. It demonstrates a capability of formation of such peptides directly in milk products during their making and maturation under the action of proteolytic system of lactic acid bacteria and milk clothing proteases.