Rosemary and sage are two herbs for hair loss that have shown benefit traditionally when used externally.
It is suggested that to promote a clean scalp, stimulation of the hair root, and thickening hair one should boil together in water rosemary, sage, peach leaf, nettle and burdock. Then strain the loose herbs from the liquid and use the liquid to wash the hair daily.
Also recommended is steeping one ounce of ground rosemary, two ounces of ground sage, and a half ounce of ground nettles in one pint of ethyl alcohol for a week, straining the solution and adding one ounce of castor oil and one ounce of water to the liquid.
This makes a great hair lotion that you can apply at night before bed or just before shampooing.