PURPOSE:To form an oral intake composition useful as a healthy food for preventing hypertension and alleviating hypertensive tendency, by using inhibitory peptide of angiotensin converting enzyme derived from casein and egg yolk. CONSTITUTION:An oral intake composition containing a peptide inhibiting angiotensin converting enzyme(ACE for short) obtained by decomposing casein with protease and egg yolk. The peptide inhibiting ACE is usually isolated in the form of powder, blended with egg yolk and used as it is or preferably as a composition in any shape or configuration together with a proper nontoxic carrier for oral administration. Egg yolk of egg of chicken, quail, ostrich, etc., sold in the market can be used as the egg yolk. Total content of the inhibitory peptide of ACE and egg yolk is generally about 1-100wt%. and the ratio of the above-mentioned peptide and the egg yolk is generally about 1:10-3:1.