['Hyperhomocysteimemia is a cardiovascular risk factor even among children. Supplementation of oral folic acid may reduce homocysteine levels to normal. However, data is limited at this point for healthy children and adolescents.', 'Five hundre and twenty four children participated in the study; Twenty six of them were found to be hyperho mocysteinemic(>95(th) percentile for age). Twenty of them received 5 mg of folic acid twice per week for two consecutive months while the other six received a diet rich in dietary folate.', 'Serum homocysteine levels were statistically significantly decreased from 13.1 (10-24.2 micromol/L ) to 7.7 (4.9- 15.2 micromol/L), p<0.001. Serum folate levels were significantly rose from 4.3 (3-20 ng/mL) to 16.8 (7-20 ng/mL), p<0.001. On the contrary, no important changes were observed in the above parameters in children to whom a diet rich in folic acid was recommended. Homocysteine levels were found to be positively associated with age (r=0.314, p<0.001), BMI (r=0.192, p<0.001), WC (r = 0.215, p<0.001), simple sugars (r= 0.182, p<0.001 ) and negatively associated with folic acid (r = -0.331, p<0.001), vitamin B12 (r = -0.214, p<0.001) and dietary folic acid (r= -0.228, p=0.003).'] Does oral supplementation of folic acid for two months reduce total serum homocysteine levels in hyperhomocysteinemic Greek children?