Actually, hair once it is out of the follicle IS dead. Still in your scalp...alive.
I was told that eating gelatin will keep your nails strong and your hair strong as well. Styling products can coat and give it pseudo strength, but your best bet is to keep it strong right from the start.
Hair grows approximately 1" every 6 wks. according to an all about hair book that I read once. Keep it strong by eating healthy, using no styling products and no hair dryers, etc...This from someone with long hair who has been told by a hairdresser that it is nice and healthy with very few split ends.
Good luck!