Quick answer: Red light therapy (photobiomodulation) exposes skin to low-level red and near-infrared light — usually 630–660 nm and 810–850 nm — which your cells’ mitochondria absorb to nudge up energy (ATP) production. The best-supported uses are skin (collagen, fine lines) and hair growth; many other marketed claims have thinner evidence. Typical sessions run 10–20 minutes, a few times a week.
How red light therapy works
Specific wavelengths of red and near-infrared light penetrate the skin and are absorbed by an enzyme in the mitochondria (cytochrome c oxidase). The leading theory is that this boosts cellular energy and signalling, which can support repair processes. Wavelength and dose matter — random red LEDs are not the same thing.
What the evidence actually supports
Controlled studies are strongest for skin rejuvenation and for hair growth (low-level light therapy is FDA-cleared for pattern hair loss). Support is emerging for inflammation and muscle recovery, and weakest for bold claims like fat loss or “detox.”
How to use it
Sit or stand the recommended distance from the device, expose the target area for 10–20 minutes, and be consistent — results build over weeks, not days. Use eye protection with strong panels.
Every red light therapy question, answered
- Red light therapy benefits
- Does red light therapy work?
- For skin: wrinkles & tone
- Do red light masks work?
- For hair growth
- For acne
- Red light vs infrared
- Panel vs mask
- How often to use it
- At home vs in-office
Shopping for a device? See our red light therapy picks, or start with the complete red light therapy guide. General wellness information, not medical advice.
FAQ
Is red light therapy scientifically proven?
It has solid controlled-study support for skin rejuvenation and hair growth; evidence for many other uses is weaker or early.
How long until red light therapy works?
Most skin and hair studies run 8–12 weeks of regular use before measurable change.
Buying for muscle recovery? Compare panels on measured irradiance, not claimed wattage.