9 Best Red Light Therapy Hair Growth Devices 2025, Reviewed

What are the leading causes of hair thinning and hair loss?Almost all men, and over half of all women, will experience hair loss in their lifetime – and the most common cause of this hair loss in all genders is “androgenetic alopecia”. Genetics can be at play, of course, and lifestyle factors like pregnancy and stress can lead to hair loss (telogen effluvium is a post-stress form of hair loss), but androgenetic alopecia is the most common cause.What wavelength of red light is best for hair growth?For red light therapy to encourage the stimulation of hair regrowth, the optimum wavelength range is considered to be between 620 and 670 nanometers (nm). CurrentBody's device emits a spectrum of red light between 620-660nm which is, more specifically, the most effective within that range.What colour LED light is best for hair growth?For an LED device to stimulate hair growth, red light therapy is generally considered the most effective – so don't be distracted by devices that offer purple, yellow or even green light therapy. Red light stimulates blood flow, activates hair follicles, and is said to reduce inflammation.Can red light therapy actually regrow hair?What are the effects of red light therapy, and how does it work for hair thinning and hair loss? “LED (light-emitting diode) therapy, particularly in the form of low-level light therapy (LLLT), has been studied for its potential benefits in promoting hair growth,” begins Dr. Raj. “This therapy is thought to stimulate hair follicles, increase blood circulation in the scalp, and enhance cellular metabolism, which can lead to improved hair density and thickness.”He explains that “studies have shown positive results for individuals with androgenetic alopecia (male or female pattern baldness) and other types of hair loss.”From a trichologist POV, Kingsley explains that, “there is limited evidence into the guaranteed results of using LED, although there is no harm in trialing this option” as a part of your hair loss/growth journey if you so choose. She echoes the idea that devices using low-level laser therapy (LLLT) [also known as photobiomodulation] have more backing in terms of studies, but that any device is best used in tandem with other hair loss solutions, such as minoxidil “to gain the maximum benefit.” This way, your hair regrowth journey for thicker hair will not rely on just one thing - it will be part of a full treatment plan.What kind of LED devices are best for scalp?“There are many available on the market, from caps, helmets to combs,” says Dr Raj, who believes the best are “ergonomic, easy to use devices that can be used in smaller areas more consistently.”As you'll see, many brands offer solutions, ranging from caps you wear on your head, to small handheld devices you massage your scalp with. The latter can help to stimulate circulation at the scalp where hair grows, and can sometimes be used alongside scalp scrubs or oils, making them potentially doubly as effective.But it's really down to preference and budget in terms of which hair loss treatment is best for you. LED devices just offer a great non-invasive treatment option, no matter which you choose.Are red light therapy devices for hair loss safe?Experts I quizzed agreed that genuine, high quality devices (such as the ones we've reviewed) are safe – and you should not experience unwanted side effects. That said, you must always follow the specific product's instructions.“Some users may experience mild irritation, redness, or discomfort on the scalp; however, these symptoms are often temporary.” Dr Raj adds that consulting with your doctor or derm is essential if persistent reactions occur.How often can you use red light therapy on hair?This is very dependent on your particular device, but in general, “consistency is vital across all home use tech and none more so than with hair growth,” according to Newman, who adds that the CurrentBody Helmet, for example, should be used daily.Newman explains that “regular usage is key to seeing results, and frequency typically depends on the device type and treatment goals. For example, many LED devices are designed for daily or every-other-day use for 10–20 minutes per session, though specific guidance will depend on the model." He adds: "Consistent use is critical to achieving and maintaining the desired effects, whether for skin improvement or scalp treatments​.”Ferguson and Measures recommend that for their The Light Salon device, you should use it “three to five times a week.” They conclude: “used this often, the number of treatments amounts to 240 a year, making an LED an amazing investment.” Elsewhere, the FAQ 301 device is best used on alternate days.How long does it take to see hair growth with red light therapy?Unfortunately, there is no solid answer to this – due to varying factors. “Hair type, the level of hair loss and hair density will all contribute to how quickly you see results,” explains Newman. “Also, you would need to consider any other treatment therapies you are using alongside devices, such as oral minoxidil.”“Results from red light therapy for hair growth can vary among individuals,” confirms Dr Raj, who adds: “Generally, users may begin to notice improvements within 12 to 24 weeks of consistent treatment. However, the full effects often take several months to manifest.” In other words, it's crucial to be patient!

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