title: Clinical improvement of photoaged skin with 50% glycolic acid. A double-blind vehicle-controlled study.
abstract: BACKGROUND
  Although there is increasing interest in the use of glycolic acid in the treatment of photoaged skin, to our knowledge, no controlled study has been done to assess the efficacy or the mode of this agent.
  
  
  OBJECTIVE
  The purpose of this study was to determine whether 50% glycolic acid can improve photoaged skin and to study the histological basis for this improvement.
  
  
  METHODS
  Forty-one volunteers were recruited into this double-blind vehicle-controlled study. Glycolic acid (50%) or vehicle was applied topically for 5 minutes to one side of the face, forearms, and hands, once weekly for 4 weeks. Punch biopsies were taken at pretherapy and at 5 weeks for histologic study.
  
  
  RESULTS
  Significant improvement noted included decrease in rough texture and fine wrinkling, fewer solar keratoses, and a slight lightening of solar lentigines. Histology showed thinning of the stratum corneum, granular layer enhancement, and epidermal thickening. Some specimens showed an increase in collagen thickness in the dermis.
  
  
  CONCLUSIONS
  The results of this study demonstrate that the application of 50% glycolic acid peels improves mild photoaging of the skin.
authors.affiliation: Division of Dermatology, University of California at Los Angeles, USA.
authors.forename: N
authors.initials: N
authors.lastname: Newman
authors.forename: A
authors.initials: A
authors.lastname: Newman
authors.forename: L S
authors.initials: LS
authors.lastname: Moy
authors.forename: R
authors.initials: R
authors.lastname: Babapour
authors.forename: A G
authors.initials: AG
authors.lastname: Harris
authors.forename: R L
authors.initials: RL
authors.lastname: Moy
mesh_terms: D000328:Adult; D000368:Aged; D001706:Biopsy; D002615:Chemexfoliation; D004311:Double-Blind Method; D005260:Female; D006016:Glycolates / Q000008:administration & dosage*; D006801:Humans; D008297:Male; D008853:Microscopy; D008875:Middle Aged; D015595:Skin Aging / Q000187:drug effects* / Q000473:pathology; D013997:Time Factors
chemical_list: D006016:Glycolates; C031149:glycolic acid