Combining 590 nm Light with Minoxidil to Increase Hair Growth

red light therapy for hair growth dose

Researchers tested low level light therapy to see if it would reduce scalp inflammation that interferes with hair re-growth. They tested the L’Oréal LLLT/GentleWaves® device’s effect on hair growth. 64 men with androgenetic alopecia received 590 nm for 70 seconds (pulsed) 1x/day for 3 days. Their scalps were DNA squenced. Then they tested the device as well as Minoxidil on 135 men and women with alopecia. The 590 nm treatment correlated with downregulation of sclap inflammatory biomarkers in half the treated subjects. The second study showed increase Minoxidil hair growth. Those receiving 2% Minoxidil responded as if they had received 5% Minoxidil.

The Complete Book of Ridiculous Red Light Answers


Light therapy heals with photons. A red incandescent bulb throws more heat than light, so it’s not likely to have a light therapy effect. Yes, you can use light therapy to reduce acne scars. Traumatic brain injury, Parkinson’s and dementia respond to red and infrared light therapy.

Infrared Plus Minoxidil Superior to Minoxidil Alone at Growing Hair

red light therapy for hair growth dose

Researchers tested 785 nm (infrared) light on balding patients aged 17 to 45 years old.

The treated group received 5% minoxidil solution and infrared light therapy two times per day.

The control group received 5% minoxidil and a sham LED treatment device.

Researchers tested hair patient satisfaction,  hair density and hair growth.

At 12 months, the patients getting both minoxidil and LED ligh therapy were singificantly happier with their hair growth than the sham group.

Increase Hair Coverage with 660 nm Red LED Light

red light therapy for hair growth dose

Researchers applied 660 nm LED light to balding men and women over a 24 week study.

The light therapy significantly increased the hair’s coverage area.

More of the subject’s heads had hair at 24 weeks than at the beginning of the study.

The sham group saw no hair gains.

Researchers also used 650 nm red laser light, and got the same results.

Helmet LED Treatment Grows Hair

red light therapy for hair growth dose

Researchers treated balding men and women aged 19 to 65 years old with 655 nm red light therapy (LLLT: low level light therapy).

They fitted helmets with 2.36 mW LED 655 nm output to administer the treatment.

They tested hair growth at 0, 8 and 16 weeks.

At the end of 16 weeks, particpants in the treatment group had more hairs and they were thicker as well.

The control group did not experience an increase in hair quanity or thickness.

There were no adverse side effects.

Hair Regrowth and Lichen Planopilaris Symptom Reduction

red light therapy for hair growth dose

Researchers treated patients to low level light therapy (LLLT) using red light with a  630 nm wavelength.

All treated patients had lichen planopilaris.

Symptoms included redness (erythema), corkscrew hairs indicating too much keratin production (perifollicular hyperkeratosis), and hair loss.

After 3 and 6 months, the patients had more and thicker hair.

After 3 months, the erythema and perifollicular hyperkeratosis settled down, but after 6 months it had returned.

Use Red Light Therapy to Grow Back Your Hair

The Theradome hair growth device

Red light therapy is a science-backed hair growth treatment. Hundreds of studies support its use. Thousands more support the use of red light for safe, effective treatment of other conditions. So long as your light has the right coverage, wavelength, and power, there is a very good chance you can use it to stimulate hair growth.