concentrated milk products or a fraction of the milk containing the biologically active factor such as the acid whey fraction by the term 34 whey 34 is intended for the purpose of this invention milk from which cream and caseinaceous material has been separated the milk of the invention can be provided in any amount which affects the decrease of hypertensive conditions in animals daily amounts equivalent to 1 ml to 10 liters of whole fluid milk can be provided depending on the particular circumstances of the hypertension and the animal species the preferred dose is 0 5 1 0 g of skim milk powder per kg of body weight the fat free milk can of course be incorporated into any food product as long as the food product is not treated at a temperature which is too elevated and would inactivate the anti hypertensive properties of the product a temperature lower than 140 u00b0 c is preferred for example puddings or yogurt may be prepared with anti hypertensive milk further when the fat free milk is treated with rennet and the casein is separated after precipitation thereof it is found that the sweet whey supernatant fraction contains the anti hypertensive factor this sweet whey factor may also be added to syrups ice cream mixes candy beverages cattle feeds or the like see kozakowski supra at 446 the process of producing the hyperimmune milk containing supranormal levels of anti hypertensive factor is as follows in summary one process of producing the hyperimmune milk containing supranormal levels of anti hypertensive factor.