Several double-blind trials have tested light in the ear. Most found nothing.
Short answer: shining red or near-infrared laser light into the ear has been tested against dummy devices for twenty years. The largest double-blind trials — including one where people used a red laser every day for three months — found it worked no better than the dummy. One trial in workers with noise-damaged hearing found a short-lived benefit that most participants did not get. A newer near-infrared ear device has two small trials from one research group, with mixed results.
Ads for red light ear devices tend to show the hopeful results and leave out the null ones. Here are both.
Red light therapy · evidence checked 2026-10-24
Grades are calculated from the studies listed, by fixed rules.
One double-blind trial in male workers whose tinnitus came from noise exposure: better than placebo right after treatment, but most participants did not respond (57%, then 70% at 3 months) and the effect faded. It has not been repeated — and noise damage is itself a kind of inner-ear hearing loss, the group in which two double-blind trials found nothing.
The same research group ran both trials. In the larger, tinnitus scores were no different from sham at the end. In the smaller, single-blind trial some questionnaire scores improved, and faded once treatment switched to sham.
Two double-blind trials of a 650 nm, 5 mW laser in the ear — daily for 4 weeks in one, 3 months in the other — found it did no better than a dummy device. A 2022 review of ten trials found eight showed no effect.
Related: does red light therapy work? · every claim on the body map