Introducing Control GX + THK Grey Reducing and Thickening Shampoo from the #1 brand in mens hair color. CGX + THK is formulated in a bio-tech lab with healing Alpha Keratin, previously utilized for wound healing and muscle regeneration and is now unleashing its transformative power to reinforce men’s hair. Control GX + THK is the first smart shampoo that washes, reduces greys, and thickens all in one! *After 5 applications to hair as measured by technical instrument in IEC & PCI Study (2023).