The invention relates to a cosmetic, pharmaceutical, dermatological, nutraceutical or oral cosmetic composition having, as main preserving system, a mild preserving system formed from compounds with a broad antimicrobial spectrum, which have only one pKa, the said pKa being greater than or equal to 10, the said mild preserving system being present in a content strictly greater than or equal to 1% by weight relative to the weight of the said composition.The invention also relates to the use, in a cosmetic, dermatological or pharmaceutical composition, of at least one compound of formula (I), as a preserving agent:
