well if you don't want to put your trust in conventional medicine, i suggest trying what sunday said, kelp supplements, as well as silica and vitamin d.
you could try buying a natural shampoo that will stimulate scalp circulation (thereby stimulating hair growth) such as lush's
new shampoo bar. it's red and smells cinnamon-y.
scalp massage is another option, you can purchase oils which will stiumulate circulation, and mix them with a carrier oil. do some research into which would suit your hair/skin etc.
good luck