The invention relates to a microneedle array, in particular an applicator system, and the use thereof for the intradermal application of active ingredients in the form of salts, in particular medicinal products in the forms of salts, wherein said microneedle array is suitable for penetrating the skin of people or animals and the microneedles consist of a formulation, containing at least one active ingredient in the form of a salt and at least one biodegradable polymer.