- Leave in intensive treatment for Non Color-Treated Hair. Reconditions and rejuvenates the hair and scalp with LifeXtend Complex. Thickening technology adds weightless volume. LifeXtend Complex Plus with Saw Palmetto: Hydrates and nourishes while strengthening and fortifying for thicker, fuller looking hair. Kelp Extract: Helps protect from damage. Soy Amino Acid: Penetrates the hair shaft to improve strength & help hair feel thicker. Apply evenly to scalp and hair. Do not rinse. May cause a temporary redness.