Metabolism Vitamin a acetate is hydrolyzed by enzymes into vitamin a and further is oxidized to retinal and retinoic acid. finally the conjugates of retinoic acid with glycuronic acid is excreted in bile or urine OH [O] so [o]Metabolism • Vitamin A acetate is hydrolyzed by enzymes into vitamin A and further is oxidized to retinal and retinoic acid. Finally the conjugates of retinoic acid with glycuronic acid is excreted in bile or urine