Red light therapy hat or cap: what to know
A red light therapy hat or cap is lined with small LEDs or laser diodes that sit close to the scalp. They're popular because they're hands-free and easy to use at home.
Talk to your doctor before you start, especially if you are pregnant, take photosensitizing medication, or have a skin or eye condition. See safety and contraindications.
Set realistic expectations
Some people use caps hoping to support hair health. The research is still developing, results vary widely, and hair changes have many causes. If you're losing hair, see a doctor or dermatologist first to find out why.
What to compare
- Coverage: how many light sources, and whether they cover the whole scalp or mainly the top.
- Wavelengths listed: most caps list red light around 630–670 nm.
- Fit and comfort: a cap you don't mind wearing is one you'll actually use.
- Timer and battery: an auto shut-off makes sessions easier to stick to.
- Warranty and return window: caps can be expensive, so a long return window matters.
Safety
Keep the lights away from your eyes, follow the maker's session length, and talk to your doctor first if you take medication that makes you sensitive to light.
We may earn a commission if you buy through links on this page, at no extra cost to you. It never changes what we say. How we make money.