Ive heard that they make your hair grow and other good things... I assume it doesnt matter if you take them not being pregnant but it wont affect your menstrual cycle or anything like that.. right?

I don't think it's bad to take when your not pregnant though a regular womens multivitamin would work for you just as well. Prenatal ones have higher amounts of everything, mainly folic acid and iron which most women don't need large quantities of as a daily dosage when not pregnant. Ask your regular Doctor and see what they say.

It's fine there just great multivitamins great for hair and nails

A lot of people take then when they aren't pregnant. It's perfectly fine.

It is fine to take them at any time, pregnant or not.

-Amy
Parenting Zen

Actually, I read an article recently on folic acid. It's fine to take prenatal vitamins when you're not pregnant, but one way folic acid can hurt you is if you have cancer. It makes things in your body grow faster, so it also makes cancer cells grow faster.

You might want to check out a folic acid supplement if you're worried about hair and nails, rather than taking a prenatal.

My hair dresser suggested I take them when I was growing my hair out. Plus doctors suggest taking them while trying to conceive so I'm sure they're fine.

I started taking them while I was TTC. I ran it by my Dr who said it was a good idea because of the folic acid. I'm sure it is fine. Of corse if you are always constipated, that's why, LOL!

My prenatal vitamins have an added stool softener so thankfully I don't have a problem with constipation.