Protein-calorie malnutrition is common in CAPD patients and is associated with increased morbidity and moitality. To evaluate the effect of an oral nutritional supplement(Greenbia RD, DR. CHUNGS FOOD CO., LTD, Seoul, Korea) providing 800Cal and 24g of protein daily in addition to their usual diet on the nutritional status, we conducted a prospective study in malnourished CAPD patients (N=26). Subjects were randomised into 2 groups' group I(N=15) taking Greenbia RD" for 3 months, group II(N=11) as control. In group I, the data of 12 patients who completed the 3-months study period were analyzed. There were no statistically significant changes in biochemical parameters including total protein, serum albumin, prealbumin, transfemn during the study period in both groups, but IGF-I increased significantly in group I (129.2± 88.8 vs. 174.1± 109.3ng/mL, P<0.05). Total calorie (1349±272 vs. 1720±251CaVday, P<0.05) and protein intake(1.05±0.29 vs. 1.2±40.25g/kg/day, P<0.05) as- sessed by 72-hours dietary recall method increased significantly in group I with oral supplement. Body weight(52.4±8.3 vs. 54.2±8.8kg, P