What it Does BosleyMD Hair Thickening Fibers add instant volume and density. Buildable fibers, made from colored keratin, bond to and blend into existing hair to add instant volume and fullness for the appearance of naturally thick, full hair. How to Use Style hair as usual. Liberally shake fibers into thinning areas and gently style into place with fingers or comb. Shampoo to remove. FOR USE ON DRY HAIR ONLY. Ingredients Keratin, Cetrimonium Chloride, DMDM Hydantoin,Silica Please be aware ingredients are subject to change periodically. It is recommended you check the product packaging prior to use for a complete ingredient list.