As mentioned earlier, better blood flow leads to a better supply of nutrients to your scalp. Vitamin Edoes this job well, and so does iron. In fact, too little iron has been noted as a major cause of hair loss and shedding. To help with the absorption of this nutrient, include vitamin C with your iron intake. This vitamin also helps in the production of collagen and in strengthening the capillaries that provide your hair with the essentials.