PHYTOVOLUME Volumizing Shampoo With Yarrow extract PHYTOVOLUME increases the diameter of extremely fine hair. A Yarrow and Tormentil decoction with toning and astringent properties makes the hair strands lighter, thus adding bounce, all the way down to the roots. From the very first application, your hair will have greater body and look visibly thicker and full of energy. Use only a small amount of shampoo in order to avoid excess static electricity.