Hair problem

Artindark pretty much covered it all =)
Olive oil made from Kalamata olives is excellent (Greek olive oil). It's rather inexpensive and one drop goes a long way.

Creating an infusion of the yarrow flower AND root can help strengthen the roots of your hair.
Eating almonds, Brazilian nuts, cashews, etc is good for strengthening the hair itself.

The hair and nail vitamins sold commercially are really quite effective. In addition to the herbal suppliments suggested here also be sure to do the small things that can help stop hair loss. Dont blow dry your hair or wash your hair too often. Use a gentle brush, avoid chemical products such as perms and dyes. Do not wear tight fitting hats and caps.