The most common kind of hair loss is pattern baldness. It happens when hair follicles shrink and stop working. The first sign is the appearance of strands that are thinner and more fragile. Then the scalp becomes more visible as fewer hairs grow to replace those that shed. That’s because the anagen phase becomes too short for the hair to grow out of the scalp. Plus, the hairs that remain aren’t securely anchored. And this condition happens to both men and women.
3. Hair fibers. The best (and easiest) way to hide a widening part or sparse patch is with hair fibers. They’re tiny, charged fibers that adhere to your scalp (until your next shampoo). Toppik Hair Building Fibers ($25) come in a range of colors so you can easily find one that matches your own hair. (In a pinch, you can also brush a powdered eye shadow that matches your hair color along your part.)

Laser treatments are the latest frontier in staving off hair loss, and they’ll be the first choice for fans of sci-fi. As silly as they may sound, these treatments do work — the American Journal of Clinical Dermatology in 2014 reported a “statistically significant difference” in hair density with no “serious adverse events” or side effects.The bad news: Laser treatments tend to be expensive, progress is slow, and they don’t always produce stellar results.
Her hope is that the procedure (she has helped start a company named Rapunzel to develop it) will eventually become another lunchtime cosmetic treatment. Once a patient has had her cells harvested and cultured, they could be stored indefinitely; then, after giving her doctor a month’s notice (the time it takes to grow the million needed), she could pop in for injections. Costs would likely be on par with hair transplants, roughly $10,000 and up.
The HairMax Ultima 12 LaserComb ($395) makes for a great addition to any hair loss regimen — provided you can afford it. Dr. Wolfeld notes that it’s a popular option in his practice. “Some people like the action of combing something through their hair,” he says. “They find that to be a little bit easier to do as part of their routine in the morning.” Dr. Khadavi also recommends using a laser treatment of some kind in conjunction with other treatments. “Lasers do help in stimulating the hair into the growth phase. We don’t know the exact mechanism of how it works, but it definitely helps.”
The easy-to-use spray bottle allows you to apply the serum directly to your scalp, or you can spray it onto your hands to rub into parts of your scalp. Each bottle offers a three month supply and should be used twice daily. It has outstanding reviews online, partly because it does not leave a sticky residue or cause preliminary hair shedding like most other regrowth treatments.
In either sex, hair loss from androgenetic alopecia occurs because of a genetically determined shortening of anagen, a hair's growing phase, and a lengthening of the time between the shedding of a hair and the start of a new anagen phase. (See "Life cycle of a hair.") That means it takes longer for hair to start growing back after it is shed in the course of the normal growth cycle. The hair follicle itself also changes, shrinking and producing a shorter, thinner hair shaft — a process called "follicular miniaturization." As a result, thicker, pigmented, longer-lived "terminal" hairs are replaced by shorter, thinner, non-pigmented hairs called "vellus."
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