most sulfur treatments, well vitamins atleast, say not to use while pregnant, so I wouldn't. Just take your normal prenatal vitamin. If this is your first child, you will notice that pregnancy is a wonderful thing for your hair and skin. Your hair will grow faster and thicker on it's own because it doesn't shed while pregnant. Just take good care of your hair the way you normally would, but I'd skip on all the extra vitamins because you never know what is good or bad for your fetus these days. Every time you watch the news, they've banned something from a pregnant womans diet.