Hair growth / androgenetic alopecia
Home-use LLLT devices for pattern hair loss systematic review and meta-analysis
Lueangarun S, Visutjindaporn P, Parcharoen Y, et al. Journal of Clinical and Aesthetic Dermatology. 2021.
This review focused on FDA-cleared home-use low-level light/laser devices for pattern hair loss.
Evidence grade
moderate
Effect direction
positive
Panel relevance
not-panel-replicable
Key findings
- The meta-analysis included seven double-blind randomized controlled trials.
- LLLT increased hair density versus sham devices with a standardized mean difference of 1.27.
- Both comb and helmet-style devices showed increased hair growth in subgroup analysis.
Protocol details
| Wavelengths | 650 nm |
|---|---|
| Irradiance | Not reported mW/cm2 |
| Fluence | Not reported J/cm2 |
| Session time | Not reported minutes |
| Frequency | Varied by device and trial |
| Duration | Typically multiple months |
| Treatment area | Scalp |
| Device type | Home-use laser combs, caps, and helmet devices |
Caveats
- This evidence supports scalp devices more directly than red light panels.
- Long-term follow-up and severe pattern hair loss populations remain under-studied.