A little farther up the follicle is the mysterious feature called the bulge. That's where follicle stem cells live. When they get the right set of chemical signals, these self-renewing cells divide. They don't divide like normal cells, in which both halves become new cells that keep splitting and developing. Only one half of the follicle stem cell does that. The other half becomes a new stem cell, and stays put for future regeneration.
In-office laser light treatments or at-home handheld devices, such as the HairMax LaserComb, supposedly grow new hair by stimulating blood flow to the area (think: an amped-up version of a scalp-stimulating shampoo). Just don’t expect the device to make your noggin go from looking like George Costanza’s to Jerry Seinfeld’s. “These lasers won’t grow any new hair. If anything, they may just help you hang on to some of the hair that you already have a bit longer,” says Dr. Joyce.
Surgery: Men tend to be better candidates for surgical hair-replacement techniques because their hair loss is often limited to one or two areas of the scalp. Procedures include grafting, which transplants from one to 15 hairs per disc-shaped graft to other locations. Scalp reduction removes bald skin from the scalp so hair-covered scalp can be stretched to fill in the bald areas. Side effects include swelling, bruising and headaches.
Female hair loss can have various causes. Thinning hair can be due to changes in your hormones and many women experience some degree of hair loss after pregnancy. In most cases, however, thinning hair occurs as you get older and it is hereditary. This type of hair loss is not dangerous and it does not usually indicate that you suffer from an underlying illness.
Harklinikken does not advertise, but the 25-year-old multinational company is beginning an aggressive expansion into the $3.6 billion hair-loss market in the United States, meaning you’re likely to hear a lot more about it. A New York clinic opened in June inside the Core Club in Midtown (you don’t need to be a member to get an appointment); and in August, Harklinikken consultations became available at some 70 Women’s Care Florida obstetrics and gynecology clinics. (Roughly 75 percent of the company’s 50,000 active users are female.)