Abstract: The invention relates to a pseudo-dipeptide product obtained by coupling between histamine or methyl-substituted histamine and an amino-acid having formula ##STR1## wherein A is a radical selected in the group comprising amine radicals, amides, lactames, urethans; R.sub.1, R'.sub.1, R.sub.2, R'.sub.2. . . R.sub.n, R'.sub.n represent each a hydrogen atom, a hydrocarbon radical or a functional group; Y and Z represent each a hydrogen or a fluorine atom, or a hydrocarbon radical which may be substituted by one or a plurality of functional groups; and n is an integer higher than or equal to 1; the covalent bond with the histamine or the methyl-substituted histamine being a peptide bond between the carboxylic radical of the amino acid and the amine radical of the histamine. The pseudo-dipeptide products of the invention may be used in therapeutical, cosmetological and agro-alimentary applications and particularly for the treatment of cataracts.