title: Topical 8% glycolic acid and 8% L-lactic acid creams for the treatment of photodamaged skin. A double-blind vehicle-controlled clinical trial.
abstract: OBJECTIVE
  To evaluate the efficacy and tolerability of 2 widely used topical alpha-hydroxy acids at low concentrations, 8% glycolic acid and 8% lactic (L-isoform) acid creams, in the treatment of photodamaged skin.
  
  
  METHODS
  A single-center, 22-week, double-blind, vehicle-controlled, randomized clinical trial assessed the overall severity of photodamage on the faces and forearms of volunteers, based on 7 individual clinical components of cutaneous photodamage.
  
  
  METHODS
  The study was performed in an outpatient clinical research unit at the Massachusetts General Hospital, Boston.
  
  
  METHODS
  Seventy-four women, aged 40 to 70 years, with moderately severe photodamaged facial skin were enrolled in the study. One subject withdrew from the study early because of skin irritation, and 6 subjects withdrew from the study for personal reasons.
  
  
  METHODS
  Glycolic acid, L-lactic acid, or vehicle creams were applied twice daily to the face and outer aspect of the forearms.
  
  
  METHODS
  Improvement in alpha-hydroxy acid-treated photodamaged skin as determined by patient self-assessments and physician evaluations of efficacy and irritancy.
  
  
  RESULTS
  The percentage of patients using either 8% glycolic acid or 8% L-lactic acid creams on the face achieving at least 1 grade of improvement (using a scale from 0 through 9) in overall severity of photodamage was significantly greater than with the vehicle cream (76% glycolic acid, 71% lactic acid, and 40% vehicle; P < .05). On the forearms, after 22 weeks, treatment with glycolic acid cream was superior to the vehicle in improving the overall severity of photodamage and sallowness (P < .05). L-Lactic acid cream was significantly superior to the vehicle in reducing the overall severity of photodamage (P < .05), mottled hyperpigmentation (P < .05), sallowness (P < .05), and roughness on the forearms (P < .05) at week 22.
  
  
  CONCLUSIONS
  Topical 8% glycolic acid and 8% L-lactic acid creams are modestly useful in ameliorating some of the signs of chronic cutaneous photodamage. These agents are well tolerated and available without prescription.
authors.affiliation: Dermatology Clinical Investigations Unit, Massachusetts General Hospital, Boston, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Stiller
authors.forename: J
authors.initials: J
authors.lastname: Bartolone
authors.forename: R
authors.initials: R
authors.lastname: Stern
authors.forename: S
authors.initials: S
authors.lastname: Smith
authors.forename: N
authors.initials: N
authors.lastname: Kollias
authors.forename: R
authors.initials: R
authors.lastname: Gillies
authors.forename: L A
authors.initials: LA
authors.lastname: Drake
mesh_terms: D000287:Administration, Topical; D000328:Adult; D000368:Aged; D004304:Dosage Forms; D004311:Double-Blind Method; D005260:Female; D006016:Glycolates / Q000008:administration & dosage*; D006801:Humans; D007773:Lactates / Q000008:administration & dosage*; D019344:Lactic Acid; D008875:Middle Aged; D014677:Pharmaceutical Vehicles; D015595:Skin Aging / Q000187:drug effects*
chemical_list: D004304:Dosage Forms; D006016:Glycolates; D007773:Lactates; D014677:Pharmaceutical Vehicles; C031149:glycolic acid; D019344:Lactic Acid