Flow chart: 51 Participants were registered on day-0. Fasting blood was collected of 10 participants on day-1*. They were instructed to continue their usual diet for next 14 days. On day-15 fasting blood was collected of all 51 participants. They consumed 3 × 200 ml of milk during the day. On day-16 fasting blood was collected. They were divided into normal and vitamin B-12 deficient groups as per pl. vitamin B-12 concentrations. Deficient participants consumed 2 × 200 ml. milk every day for next 14 days and their fasting blood was collected on day-30. Dietary history was taken on day 1, 15, 30. Participant’s milk drinking time was in the morning after breakfast, 4 p.m. and at night after dinner.