A composition includes:an aqueous composition (A) including a buffer having a pKa between 4.0 and 8.0 and having no more than one carboxylic acid function； andat least one capsule including a core and a gelled shell including a polyelectrolyte in the gelled state chelated by divalent cations, the shell fully encapsulating the core on the periphery thereof, the capsule being free of eukaryote cells.
