Mimzy, if you go to GNC, you can find a good multi vitamin made for women, with 500 mg of calcium(most i've ever seen in a vitamin). it's called Women's Ultra Mega. it also has gelatin (yes it comes in a pill) and biotin (which is uber-important for your nails). try taking that for a while, if it's not enough, they also sell a hair, skin, and nails formula. and gelatin and biotin by themselves.
also you could try tea tree oil. supposed to be good for everything.... they have it in a bottle like nail polish.
whatever you decide to try first, the people there are trained to know what they are talking about (most of the time- those at franchise stores aren't as strictly enforced as the corporate store employees).
can't really think of any other products off-hand, i'm not at work
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don't take a prenatal. it won't help you out unless you are pregnant, nursing, or trying to get pregnant. but the women's ultra mega is awesome! (and now i shall stop talk before everyone gets tired of hearing about vitamins....lol... i'm actually learning when to stop! woo hoo!! :jumping: )