The Caffine Tonic Until menopause, a womans hair roots are protected based on high levels of female hormones (estrogen). After menopause, these hormone levels will decline & the impact of male hormones will increase. The consequence: The hair will grow thinner, fall out prematurely, & the scalp will become visible. The 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). The Caffeine-based formula encourages stronger hair growth after the menopause. Use the dosage tip to apply product once a day directly into the scalp & massage in. Do not rinse out! allow solution to penetrate before brushing & then style as usual. for best results, use after Plantur 39 Caffeine Shampoo.