TRESemmé Collagen+ Fullness System, infused with COLLAGEN has been created with GLYCERINE to penetrate inside the hair. The system works to plump each strand and instantly helps hair look thicker! How to use Start with Collagen + Fullness Shampoo with MICELLAR TECHNOLOGY, to gently cleanse your hair. Use it as the first step to get visibly thicker hair, with body and texture. Apply a generous amount to wet hair, gently massaging the scalp and roots. Rinse thoroughly. Follow with Collagen + Fullness Conditioner for best results.