Red light
Kiierr 272 Premier Laser Cap
Kiierr
Laser-only cap with 272 laser diodes at 650 nm (1,360 mW total per Kiierr), worn 30 minutes every other day. Price: $1,799 list price. On sale for $1,199 as of Oct 3, 2026. Standard 2-year warranty (a 5-year warranty is a $99 add-on); Kiierr's 7-month growth guarantee allows returns only between day 210 and day 240, with a 25% fee. HSA/FSA via TrueMed, per Kiierr. 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.
Links go to the maker. Affiliates are off. BiohackList may earn commissions from qualifying purchases in the future.