Effect of vitamin A supplementation of plasma progesterone and estradiol levels during pregnancy.

The effect of vitamin A supplementation on plasma estrogen and progesterone were studied in pregnant women. While there was no change in the estrogen concentration, the mean increment in plasma progesterone in the supplemented group was significant when compared to the unsupplemented group. It is suggested that vitamin A supplementation to undernourished pregnant women may have beneficial effect on feto-placental function.