Spectral Rs Shampoo by Ds Laboratories 2 oz Breakthrough Treatment for Thinning Hair for MenSpectral.rs® Is A Breakthrough Formula For The Treatment Of Thinning Hair And Diffuse Hair Loss. Spectral.rs® Uses A Proprietary Nanosome Technology As The Delivery Vehicle Of Active Compounds Directly Into Target Cells. Spectral.rs® Works By Improving The Nutrition, Circulation, And Metabolism Of The Hair Follicle And Preventing Perifollicular Fibrosis.