Red light therapy devices address just about every skin concern these days—including your scalp. In fact, as mentioned in our Best Red Light Therapy for Hair Growth guide, hair loss support is one of the most thriving red light categories and is set to grow 92.8% by 2033.

“Red light is thought to act on cells in and around the hair follicle,” board-certified nurse practitioner Vanessa Coppola tells Vogue. “One proposed pathway involves nitric oxide, which can relax small blood vessels and may improve local circulation.

That said, the clinical studies [of red light therapy for hair growth] measure hair outcomes more directly than they measure changes in circulation.” In short, just as putting on an LED mask can help smooth fine lines or quell breakouts, a red light hat can support your overall hair regrowth journey. It’s true, there’s a lot to choose from on the market.

However, what sets HigherDose’s Red Light Therapy apart is that it's not only one of the more affordable options (yes, even at several hundred dollars), but it also offers the most discreet design.

Why We Love It: This innovative red-light baseball cap comes from LED megabrand HigherDose—and it’s just as lauded as their viral LED mask. By enhancing blood flow to the scalp, the device aims to support hair and scalp health, improve follicle function, and help minimize shedding.

Unlike bulkier options, its baseball cap style fits seamlessly into daily routines, letting you multitask with ease. Plus, the adjustable strap ensures a comfortable, customized fit.

The real perk, aside from its 650 nm wavelength, is its discreet, lightweight design.

Red-Light Wavelength

650nm

Device Type

Hat

Target Treatment Area

Head/scalp

Treatment Time

10 minutes

Specs

FDA-cleared, one-year warranty, 120 medical-grade LED bulbs

FDA-Cleared

Yes

“We built the technology into a baseball cap you can wear while answering emails or hopping on a Zoom, and you don’t have to think twice when the doorbell rings,” Jessica Alcade, HigherDose’s VP of Product, tells Vogue. “You shouldn’t have to disappear for 10 minutes because you’re wearing a huge hair growth helmet.”

Scroll on to read one Vogue writer’s experience testing the device for four months.

No, it’s not a regular baseball cap. Instead, HigherDose’s discreet red light therapy hat boasts 120 medical-grade LED light bulbs to help stimulate hair growth for those struggling with hair loss and regrowth.

“Red light therapy, also known as photobiomodulation, works at the cellular level,” explains Alcade. “Research suggests red light may interact with the mitochondria, the energy centers of our cells, and can influence cellular energy production and nitric oxide signaling, which supports healthy blood flow.”

The wavelength of the red light therapy treatment matters too. HigherDose’s hat offers a wavelength of 650 nm, which both Coppola and Board-certified dermatologist Dr.

Morgana Colombo, MD, confirm sits at the higher end of the range where most clinical research on red light and hair growth is performed. That said, Coppola and Dr.

Colombo both note that wavelength alone doesn’t ensure quality treatment—you still need the right frequency, duration, and consistency of sessions to achieve the best possible results.

Beyond the technology, one of the HigherDose hat’s key benefits is its discreet design. “One of the biggest challenges with any at-home treatment is adherence,” says Dr.

Colombo. “If a device is bulky, uncomfortable, or makes someone feel self-conscious, they’re simply less likely to use it consistently—and consistency is particularly important with hair-growth treatments.” With that in mind, the sleek baseball cap design resembles a normal accessory and is easier to incorporate into a daily routine than a bulky, astronaut-like medical gadget.

“Hair loss can be incredibly emotional for both women and men, so anything that makes treatment feel more private, convenient, and normalized can be valuable,” Dr. Colombo adds.

“Ultimately, the best device is not just one with good technology—it’s one that a patient will actually use consistently.”

Using HigherDose’s red light therapy hat is easy. Just press and hold the power button on the magnetically attached battery until the light turns on with an audible beep.

Put the hat on like any baseball cap, and wear it for 10-minute sessions daily. “Hair growth takes time, so we always tell people to think in terms of months rather than days or weeks.

We recommend consistent use for at least 16 weeks,” says Alcade. After 16 weeks, the brand recommends maintaining results with three to four sessions per week.

Historically, the first thing anyone has noticed about me (or my parents, for that matter) is thick, raven hair. It was the sort of thing people pointed out at every hair salon appointment since adolescence, and it showed up in the cost—especially when I wore my hair waist-length.

After a particularly trying year, I started noticing sudden changes in my hair—and no, it wasn’t my new bob. More hair was in my brush, and more hair fell out in the shower after shampooing.

Several tears and doctor’s appointments later, a doctor diagnosed me with telogen effluvium (AKA stress hair loss)—which can flare up from stress in the literal sense, or physical strain from illness. And so, I had to get serious about my scalp and hair routine for the first time, well, ever.

Aside from hair growth serums, supplements, and monitoring my health with my doctor, red light therapy became an essential part of my nightly regimen. Back in May, I started using my HigherDose baseball cap most nights—I’d be bluffing if I said I never missed a night or always brought it with me when traveling.

Still, for the majority of the past four months, I’ve stayed fairly consistent. By early July, I noticed less hair in my brush or the shower drain, which felt like a step out of crisis mode and, dare I say, even let me sigh in relief.

A month later, I discovered even better news—new baby hairs. No doubt, my red light therapy hat played a key role in stopping the bleeding, so to speak—or should I say, the shedding.

HigherDose’s red light therapy hat is FDA-cleared for the safe and effective treatment of hair density and thickness. In addition to FDA clinical trials, HigherDose conducted its own independent consumer testing with 28 people. According to the brand, 93% reported improvements in overall hair and scalp health, 86% reported noticing hair growth, and 83% reported growth in sparse or balding areas.

According to the brand, seeing results takes patience—at least 16 weeks—which is normal for hair follicle cycles. “With hair, we are waiting for follicles to cycle and for new strands to become visible—that is a process measured in months, not days,” says Coppola. “In hair-growth studies, outcomes are commonly assessed around 16 to 24 weeks.”

That said, Dr. Colombo reminds us not to get discouraged, as results may take longer for some. “Hair loss in particular requires months of consistent therapy for any noticeable results,” she says. “Depending on the individual and the cause of the hair loss, meaningful improvement may take three to six months or longer to appreciate.” Plus, she adds, hair density is ultimately slower to evaluate than improvements in complexion from LED face masks.

Per Coppola, once the reasons behind someone’s hair loss are identified, red light therapy can serve as a useful part of the plan, especially for pattern hair loss. “Studies of low-level light therapy have found improvements in hair density with consistent use over several months,” she explains; red light therapy supports active follicles through gradual improvement.

That said, experts strongly encourage addressing the cause of shedding with a medical professional so your diagnosis can guide the ideal treatment plan.

“The Red Light Hat is FDA-cleared to promote hair growth for those with androgenetic alopecia, commonly known as pattern hair loss,” says Alcade. Still, anyone interested in caring for their scalp and hair can use the device, whether actively experiencing hair shedding or simply taking a proactive approach.

“Hair naturally changes as we age, in density and thickness over time. You don’t necessarily have to wait until hair loss becomes noticeable to start paying attention to your scalp and creating a consistent routine.”