Plantur 39 caffeine shampoo contains a natural caffeine extract which has been scientifically proven to protect the hair roots from free radicals and dhts and also helps to improve regeneration when cleaning your hair the active ingredient penetrates into the scalp and the hair follicle and begins protecting within 2 minutes hormonal hair loss in women until menopause a womans hair roots are protected based on high levels of female hormones estrogen after menopause these hormone level