 
  research Expression of Collagen Type I, Skin Fibroblasts, and Macrophages After 1550 nm Erbium Glass Fractional Laser in Androgenic Alopecia
 The 1550 nm fractional Er:Glass laser improved hair regrowth in patients with androgenic alopecia, but didn't significantly change collagen type I, skin fibroblasts, or macrophages. More research is needed for optimal results.  
  
   
   
  