The invention relates to a peptide hydrolysate or peptide fractions of a hydrolysate of all or part of the body of snails, and to corresponding peptides, having an activity inhibiting the angiotensin converting enzyme. The invention also relates to a method for producing the hydrolysate, the fractions and the peptides composing the hydrolysate, and medicaments, functional foods and food supplements incorporating said hydrolysate, the fractions thereof or the peptides thereof.