Human recombinant autoantigens represent DIARECT's major product line. They are used for the development and production of autoimmunity diagnostic kits. Infectious disease antigens, the newest product line, are manufactured according to the customary quality guidelines of DIARECT antigens.

DIARECT is exclusive European distributor for SurModics, the leading supplier of biomolecule stabilizers. These products are regarded to be the gold standard for solid phase and conjugate stabilization as well as overall protein stabilization in liquids.

The enzymatic readout step of many immunodiagnostic procedures requires top-quality substrate components: DIARECT offers both, colorimetric and chemiluminescent substrates for horseradish peroxidase and alkaline phosphatase-based tests.