Mekanisme kerja sambiloto dalam metabolisme glukosa pada subjek normal dan prediabetes: kajian terhadap GLP-1, insulin puasa, insulin 2 jam pascabeban dan HOMA-IR = Mechanism of action sambiloto on glucose metabolism in normal and prediabetes subjects: focused on GLP-1, fasting insulin, 2 hour postload insulin, and HOMA-IR