What the evidence shows
Low-level red light applied to the scalp has been studied for androgenetic alopecia, the common pattern hair loss in men and women, for more than a decade. Randomised trials using helmets, caps and combs emitting light at 630 to 680 nm have found increased hair counts compared with sham devices after 16 to 26 weeks of use, typically three times a week. Several such devices have regulatory clearance for this use. The effect is real but moderate: thicker, denser hair in areas that are thinning rather than regrowth on bald scalp, and it stops if you stop.
What it does not do
Red light has not been shown to help alopecia areata, scarring alopecia, or hair loss from thyroid disease, iron deficiency or medication. Those need the underlying cause treated. Nor does a whole-body session in a pod deliver a meaningful dose to hair follicles under hair; scalp devices sit directly against the skin for that reason.
How it is thought to work
Light absorbed by follicle cells increases cellular energy and blood flow, prolongs the growth phase of the hair cycle and may reduce the follicle miniaturisation that drives pattern hair loss. It works best in early to moderate thinning where follicles are still active.
How often to use red light therapy for hair growth
In the trials, scalp devices were used several times a week, typically three, for around 16 to 26 weeks before hair counts were measured. Follow the instructions for your device, because using it for longer or more often than recommended has not been shown to work better. Take photographs in the same light each month so you can judge progress honestly.
Choosing the best red light therapy for hair growth
Look for a cap, helmet or comb designed for the scalp rather than a face mask or panel, with stated wavelengths in the 630 to 680 nm range, published trial data or regulatory clearance for hair loss, and a fair returns policy. Be wary of devices promising fast regrowth or results for every type of hair loss.
Our position at Omnia
We offer NovoTHOR for recovery, pain, inflammation and skin, and we do not present it as a hair-loss treatment because the evidence for hair relates to scalp-specific devices. If hair loss is your concern, the useful first step is identifying the cause: a blood test for iron, thyroid and vitamin D through our Randox service, and a GP or dermatologist review for diagnosis. If pattern hair loss is confirmed, a clinically tested scalp device used consistently at home is a reasonable option alongside conventional treatments. For recovery, pain and skin, see red light therapy in London at our Chiswick clinic.
Book red light therapy in Chiswick: sessions from £70. Book online or call 020 4515 0000. Our clinic is at 8 to 9 Bedford Corner, The Avenue, Chiswick W4 1LZ, close to Turnham Green station, on bus routes 94, E3 and 272. Limited parking is available on request when booking.
Realistic expectations
Four to six months before judging, several sessions a week, and continued use to maintain. Anyone promising regrowth in weeks is not describing the research.
When to see a GP about hair loss
See a GP if your hair loss is sudden, you develop bald patches, you are losing hair in clumps, your scalp burns or itches, or the hair loss is worrying you. Many causes, such as iron deficiency or thyroid problems, are treatable once identified. Our guides to underactive thyroid symptoms and ferritin levels explain two common ones.