Problem to be solved. To provide a novel angiotensin-converting enzyme inhibitor. Solution. An angiotensin-converting enzyme inhibitor contains at least one selected from the group consisting of an aliphatic carboxylic acid and a salt thereof as an active ingredient. In the angiotensin-converting enzyme inhibitor, the aliphatic carboxylic acid is an aliphatic hydroxy acid. In the angiotensin-converting enzyme inhibitor, the aliphatic hydroxy acid is at least one selected from lactic acid, malic acid and citric acid.

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