According to Torkian Facial Plastic Surgery, a laser hair cap is fundamentally a low-level laser therapy (LLLT) which, when worn over your head, emits red light directly to your scalp to encourage cell growth and regenerate hair follicles. As noted in a study published in the International Journal of Trichology, when the emitted photons penetrate the scalp, they stimulate adenosine triphosphate production in dormant hair follicles, jolting them out of the resting phase and into the growth phase to facilitate hair growth.

The absorption of the laser light into the hair follicle also increases microcirculation, enabling the hair to linger in the growing phase for longer and preventing hair shedding. The treatment is completely pain-free, user-friendly, and usually lasts for about half an hour on average. Laser hair caps are available in a variety of fashionable forms, such as helmets, baseball caps, and headbands. To the average eye, the cap can look just like any regular baseball hat, when in reality, it's radiating energy and supercharging your scalp.

According to the New Jersey Hair Restoration Center, laser hair caps have earned the FDA approval as a laser phototherapy device for treatment of hair loss and stimulation of new, thicker hair growth. Studies suggest that they can treat androgenetic alopecia, a common form of hair loss.

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What's A Laser Hair Cap And Do They Really Work? - Glam