While there are many factors involved in brittle hair and nails, one of the big ones is a decreased level of biotin, otherwise known as vitamin B7.
If your hair is falling out, that can indicate a shortage of a number of nutrients, including: iron, zinc, linoleic acid, and niacin (B3), in addition to biotin (B7).
These symptoms again can indicate low zinc or niacin levels, or possibly low riboflavin (B2) and pyridoxine (B6).
Restless leg syndrome affects nearly 10 percent of Americans, and women are twice as likely to experience it as men.