If your hair feels dry and dull, caffeine infused hair products help in leaving the hair smooth and soft. It works by controlling frizz and smooths the texture of the hair. Using caffeine containing hair shampoo and serum speed up hair growth. It improves the circulation of blood and results in healthy hair growth. Caffeine hair products like shampoo help in detoxifying the scalp and cleanse it thoroughly. This helps in getting rid of excess oil, debris and dirt. This will in turn promote a healthy scalp. Caffeine hair serum makes the hair detangle quickly. This in turn makes your hair shafts soften.