K.L.
I was told that the biggest difference in the prescription was the iron levels. With that said, I do not know if a prenatal vitamin, or just a regular women's vitamin will benefit you more. You might even benefit more form taking a specific vitamin or supplement such as a B vitamin or C vitamin etc. I suggest going into a health food store and asking someone who is knowledgeable.
The reason why I am skeptical of prenatal vitamins being better for hair growth is because when you are pregnant, your hormone levels change (from pregnancy, not the vitamins) and that is the reason why many women get thicker/fuller faster growing hair and nails. Also, the hormones make you keep your hair longer, and then it falls out after you deliver. There is no connection to the vitamins.
With that said, the best way to get the vitamins into your body is to eat them. For example, if the employees at the health food store or nutrition store say that antioxidants will help with clearing your skin, then you can eat a lot of blueberries and cinnamon etc. Also, drink LOTS of water! Good luck with your hair and skin!