Research shows that a topical solution of caffeine applied to the scalp and left for 2 minutes will reactivate the blood supply to the scalp strengthen the hair follicle and hair shaft suitable for hair loss in men and hormone related hair loss in women certified organic alva caffeine shampoo thinning hair is a mild yet effective shampoo designed for the care of thinning hair with organic caffeine formulation that helps to strengthen hair caffeine stimulates circulation to the root