Red Light Cap (LLLT)
Low-level laser / LED devices worn as a cap or helmet against hereditary hair loss. FDA-cleared, with moderate evidence — a device-based, non-pharmacological option.
How it works
The red-light cap uses low-level laser therapy: red light of specific wavelengths penetrates the scalp and, via the enzyme cytochrome c oxidase, boosts energy production (ATP) in hair-follicle mitochondria. This is meant to reactivate dormant follicles and promote hair growth. The evidence is moderate and the effect slow.
Dosage
Depending on the device, usually 2–3 sessions/week of a few minutes each. Patience and consistency over months required.
Considerations
Meta-analyses show a moderate increase in hair density — most likely in early/mild hair loss and with consistent use. Not a replacement for finasteride/minoxidil, more a complement. Devices are expensive and vary widely in quality. Related to the red-light/infrared therapy we describe in the piece on sunlight & mitochondria.
