The present study aimed to determine the levels of total cholesterol, triglycerides (TG), low-density lipoproteins (LDL), high-density lipoproteins (HDL), and vitamins B1 and B2 in intrahepatic cholestasis of pregnancy (ICP) patients, and to evaluate if these were involved in the pathophysiology of the disease. The prospective randomized study included 35 pregnant patients who were admitted to the Gynecology and Obstetrics Polyclinic, Faculty of Medicine at Dicle University and who were diagnosed with ICP (Group 1), and 40 healthy pregnant women who were admitted in the same period and who had no systemic diseases that might complicate the pregnancy during the pregnancy follow-up (Group 2). Serum lipid levels and vitamins B1 and B2 were determined and compared, and statistical comparisons of the groups were made. There was no difference between the TG levels of the two groups (P=0.631). Total cholesterol, LDL, HDL, and vitamin B1 and B2 levels were higher in Group 1 than in Group 2 (P=0.001, P=0.001, P=0.001, P=0.001, and P=0.032, respectively). Increased levels of vitamins B1 and B2 may indicate a need for increased energy metabolism at the fetus. So we believe that new studies are required, which will be supported by the placental analyses of the pyruvate and lactate levels in maternal blood at delivery and fetal cord blood in order to develop a better understanding on the fetal effects of energy metabolism.