The formula contains a patented black truffle extract, recognised as a powerful hair growth inhibitor, along with protein active enzymes that deliver the active ingredients into the core of the hair shaft. Hair regrowth is slower and hairs are fewer and finer. In vivo tests show hair density reduced by 80% after 56 days.Ten years ago in the Toulouse region of France a cosmetic chemist decided to find out why nothing grows under trees when there are black truffles growing in the soil.