The availability of vitamin-C of shaddock was determined by experiments on three healthy students of age 20 to 23 years, Response to doses of ascorbic acid varied from subject to subject. The average urinary excretions of ascorbic acid of the three subjects on a daily dose of 75 mg, of crystalline ascorbic acid were found to be 47.4, 41.3 and 45.7 mg and on a daily dose of 25 mg of the crystalline acid and 50 mg. vitamin-C from shaddock juice. These were found to be 50.2, 41.3 and 44.5 mg. respectively It is concluded that the availability of vitamin-C of shaddock is of the same order as that of the crystalline ascorbic acid.