How hair grows
Hair growth originates from hair papilla in the pore. The capillaries that carry nutrients to the dermal papilla are thinner than the hair, allowing only one red blood cell at a time to pass through. When blood circulation to these capillaries worsens due to blockage, nutrient supply become insufficient, causing thinning hair and making the hair dull. In addition, oxidized sebum, shampoo, or coating agents contained in rinses, can clog pores and impair blood circulation.