Trial of Folic Acid Effect on Hcy and cIMT After Kidney Tx

Inclusion Criteria: * having hyperhomocysteinemia(tHcy\>12.5 µmol/L in men and 11.5 µmol/L in women ) * No evident history of CVD 4. no evidence of cigarette smoking * not participating in other clinical studies on evaluation of cardiac diseases and * not taking any lipid lowering treatment * not being pregnant or breast feeding a baby(women) * Having HIV or viral hepatitis infections. Exclusion Criteria: * unstable condition of the transplanted kidney (Cr\> 3 mg/dl, BUN \> 50 mg/dl) * Cyclosporine (CsA) intoxication * New onset of any severe disease ( such as MI, stroke, DM, etc.).