title: Green tea and red light--a powerful duo in skin rejuvenation.
abstract: OBJECTIVE
  Juvenile skin has been the subject of intense research efforts since ancient times. This article reports on synergistic complementarities in the biological actions of green tea and red light, which inspired the design of a green tea-assisted facial rejuvenation program.
  
  
  BACKGROUND
  The approach is based on previous laboratory experiments providing insight into a mechanism by which visible light interacts with cells and their microenvironment.
  
  
  METHODS
  After 2 months of extreme oxidative stress, green tea-filled cotton pads were placed once per day for 20 minutes onto the skin before treatment with an array of light-emitting diodes (central wavelength 670 nm, dermal dose 4 J/cm2).
  
  
  RESULTS
  Rejuvenated skin, reduced wrinkle levels, and juvenile complexion, previously realized in 10 months of light treatment alone were realized in 1 month.
  
  
  CONCLUSIONS
  The accelerated skin rejuvenation based on the interplay of the physicochemical and biological effects of light with the reactive oxygen species scavenging capacity of green tea extends the action spectrum of phototherapy. The duo opens the gate to a multitude of possible biomedical light applications and cosmetic formulas, including reversal of topical deterioration related to excess reactive oxygen species, such as graying of hair.
authors.affiliation: Institute of Micro and Nanomaterials, University of Ulm, Ulm, Germany. andrei.sommer@uni-ulm.de
authors.forename: Andrei P
authors.initials: AP
authors.lastname: Sommer
authors.forename: Dan
authors.initials: D
authors.lastname: Zhu
mesh_terms: D003357:Cosmetic Techniques; D005145:Face; D006801:Humans; D007259:Infrared Rays / Q000627:therapeutic use*; D010789:Phototherapy / Q000379:methods*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012060:Rejuvenation; D015595:Skin Aging / Q000528:radiation effects*; D013662:Tea
chemical_list: D017382:Reactive Oxygen Species; D013662:Tea