Overview Study of Metformin Pharmacogenetics in Twins Status: Completed Trial end date: 2014-10-01 Target enrollment: Participant gender: Summary The trough concentration of metformin will be examined in monozygotic and dizygotic twins. Current twin study will determine the total weight of genetics on the trough concentration of metformin. Phase: Phase 1 Details Lead Sponsor: University of Southern DenmarkTreatments: Metformin