We recommend using gentle shampoos and nourishing conditioners. Please take a close look at the ingredients in your shampoo, conditioner, and styling products. Many of the products used can prevent Hairprint® from fully functioning. We urge you to avoid non-water soluble silicone ingredients, which include: dimethicone, dimethiconol, phenyl trimethicone, amodimethicone, and cyclomethicone. These products may clog the hair follicle and leach nutrients from the hair. Please do not use Castile Soaps on your hair as they build up and leave a fatty acid residue. Longevity Warehouse® Shampoo and Conditioner are excellent choices.