starting stage the intermediate stage or the final stage of a food production process by using a method commonly employed in the field of food industry temporary intermittent continuous or daily intake of the edible composition containing the tripeptides of the invention makes it possible to inhibit angiotensin converting enzyme and obtain for example a hypotensive effect the foods and drinks may be in the form of for example a solid a semifluid or a fluid examples of solid foods include general foods and health foods in the forms of biscuits sheets pills such as tablets and capsules granules powders and so on examples of semifluid foods include products in the forms of pastes jellies gels and so on examples of fluid foods include general drink products and health drinks in the forms of juices cold drinks tea drinks tonic drinks and so on such foods or drinks may be supplied in the form of a nutrition supplemental drink or a seasoning to enable us to continuously take the tripeptides of the invention thereby suppressing the risk of blood pressure elevation the medicinal composition of the invention contains the tripeptides of the invention in an amount similar to the edible composition as described above the medicinal composition of the invention can be temporarily administered to a hypertensive patient to suppress the angiotensin converting enzyme in the body and thereby to obtain a hypotensive effect alternatively the medicinal composition of the invention can be continuously administered.