This is a smart field combination (targets all hair needing work)
Using a combination of the older fields and a very active hydrogen peroxide removal (inner bleaching, causing the greys) via Catalase, elements of Fo-Ti Root and Nettle Extract (to help also with blood flow and general hair health) Increased L-Tyrosine for melanin production.
You may see recolouring, the colour working it way back in, or even starting at the ends of hair working back, the hair is porous, its just the building back of melanin.
Use as needed.
(premium subscription tier)