Jayden from out in Tucson Arizona mailed in this fantastic question. What are the carrot juice benefits for hair? As you may or may not already know raw fresh homemade carrot juice contains more vitamin A than any other food source in the world, thus making it super healthy for your hair. Regular and healthy cell growth for your hair, nails, and skin is all dependent on a good steady intake of vitamin A. This steady intake of vitamin A will usually result in radiant and strong hair, nails, and skin. I should also point out that you can overdose on vitamin A, so please do make sure that you are only getting the optimal amount and nothing more. To receive an optimal amount of vitamin A in carrot juice you need to drink one pint to a liter per day several times a week. After just a week of regularly drinking carrot juice you should start to notice a strengthening of your hair, as well as a more hydrated scalp. So pour yourself a glass of carrot juice today.