Plantur 39 Caffeine Shampoo for Fine, Brittle hair (250ml Bottle):nUntil menopause, a woman\'s hair roots are protected based on high levels of female hormones (oestrogen). After menopause, these hormone levels will decline and the impact of male hormones will increase.nThe consequence: nThe hair will grow thinner, fall out prematurely, and the scalp will become visible.nThe caffeine in these shampoos prevent the hormone-induced exhaustion of hair production. During hair washing, the active ingredient penetrates all the way into the hair follicle (detectable after 120 seconds).