There have been conflicting "reports" on this from people. Some people believe that the vitamin itself has helped with hair growth, skin health and nail growth. While others believe that the vitamin is no different than taking a regular multi. Then there is the group of people who believe that it is the combination of pregnancy hormones and the prenatal vitamins that cause all of the changes in hair skin and nail health. If you are not taking any vitamins at all and then suddenly start taking something, of course you are going to notice a difference in these areas. I started taking them back in high school, and while I'm sure they helped, they were not the deciding factor in my hair growth or skin health. However, my nails were the best they've ever been when I was taking them. I recently decided to stop as I am taking a multitude of other vitamins and feel they will be juss as beneficial without the added stuff from the prenatal. However, I am thinking about adding folic acid to my list as I don't feel I am getting enough from other means, and know that iron and folate are a big part of prenatal vitamins. HTH.
