Plantur 39 vital caffeine shampoo for coloured hair contains a natural caffeine extract which has been scientifically proven to protect the hair roots from free radicals and dhts and helps improve regeneration during hair washing the active ingredient penetrates into the scalp and the hair follicle and begins protecting within 2 minutes how it helps your hair active ingredients in the shampoo protect within the first 2 minutes of hair washing for up to 24 hours the active caffeine ingredi