Red light
Acts on: scalp
Per its manualRed light turns on by itself in both modes. It is part of the light therapy that supports scalp care.
3 Studies
Meta-analyses found increased hair density versus control in androgenetic alopecia.
What is known
- In one analysis, laser-only devices performed better than combined laser and LED devices.
- Visible changes may take six months or more.
What is not clear yet
Very few studies support the many devices on the market, and some had ties to manufacturers.
Publications about the technology in general: they do not mention Eternas or endorse its products. Summary made with AI from them.





