Permanent hair reduction with a home-use diode laser: Safety and effectiveness 1 year after eight treatments

Lasers Surg Med. 2012 Sep;44(7):550-7. doi: 10.1002/lsm.22051. Epub 2012 Aug 7.


Background and objectives: To evaluate the safety and efficacy of a home-use hair removal diode laser (TRIA Beauty, Inc., Dublin, CA) in a multiple treatment regimen.

Study design/materials and methods: Thirteen indicated adults with naturally brown or black hair and Fitzpatrick skin type I-IV received 8 monthly treatments with the diode laser at three fluences, with a fourth area left untreated as a control. Quantitative hair counts were made at each treatment visit and periodically for 12 months after the last treatment.

Results: The treated sites exhibited statistically significant hair count reduction that generally increased with each treatment and remained stable during the 1 year follow-up period. The mean percent hair count reduction was 47%, 55%, and 73% at 1 month after the last treatment and 44%, 49%, and 65% at 12 months after the last treatment at fluences of 7, 12, and 20 J/cm(2) , respectively, compared to control. Eighty-six percent (86%) of subjects had greater than 30% hair reduction and 38% had >80% hair reduction at 12 months post-treatment. At the same time point, 31% of subjects reported complete (100%) hair removal and 69% reported that the hair that did regrow was less noticeable due to being finer and/or lighter. The only observed side effects were erythema and edema that were mild, transient, and self-resolving usually within a few hours.

Conclusions: The home-use diode laser was safe and highly effective at permanently reducing unwanted hair.

Publication types

  • Controlled Clinical Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adult
  • Hair Removal / methods*
  • Humans
  • Lasers, Semiconductor / therapeutic use*
  • Middle Aged
  • Patient Satisfaction / statistics & numerical data
  • Prospective Studies
  • Treatment Outcome
  • Young Adult