Powered by FILLER-A100 and Amino Acid, the Serie Expert Pro Longer Ends Filler Concentrate Single Dose is the go-to treatment for long hair suffering from thinned ends. Thanks to the high concentration of the patented FILLER-A100 molecule, this diruptive professional formula instantly provides strength and durable thickness to ends. Once a week, replace the Lengths Renewing Conditioner or Masque with the Single Dose Concentrate. Break the capsule and apply the concentrate on the ends.