Q: I am 22 and losing my hair all across the top of my head. How can I thicken my hair to its level a few years previously? — I.L., Kentfield, CA

A: If medication, such as finasteride, is successful it can thicken hair by increasing the diameter of the existing hair shafts. Although the cosmetic benefits can be dramatic in a person with significant hair loss, a hair transplant can not restore hair to its original density, since it only moves the existing hair around and does create new hair.

When hair cloning technology is available, this will change as a person’s donor supply will be increased.