Red light
Kiierr 148 Pro Laser Cap
Kiierr
Laser-only cap with 148 laser diodes at 650 nm (740 mW total per Kiierr), worn 30 minutes every other day; the smaller sibling of the Kiierr 272 Premier. Price: $999 list price. On sale for $799 as of Oct 3, 2026. 2-year warranty. Regulatory: FDA-cleared (K181878, which covers the Kiierr 272 Premier and 148 Pro) for over-the-counter use to promote hair growth in women (Ludwig-Savin I-II) and men (Norwood-Hamilton IIa-V) with androgenetic alopecia and Fitzpatrick skin types I-IV; not cleared for other types of hair loss. Kiierr's DualWave, Ultra Flex and 272 Elite caps have no clearance under those names. Evidence grade: B (for the device category, androgenetic alopecia only; not graded for this specific device or for other types of hair loss). A 2025 meta-analysis of 38 studies (about 2,930 people with androgenetic alopecia) found a larger increase in hair density with light therapy devices than with placebo or sham after 4-26 weeks, but results varied widely between trials and many trials were small or funded by device makers. Goals: hair. Directory: Red light > Laser & LED hair caps.
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